Answer:
The following are the steps illustrating the production of an action potential via the voltage-regulated channels:
1. First, the hypo-polarization of the stimulus takes place.
2. The opening of sodium cation gates takes place, resulting in the diffusion of sodium ions within the cell.
3. The threshold is attained at -55 mV, positive feedback takes place, that is, more opening of Na+ gates takes place, and thus, more diffusion of Na+ ions takes place within the cell resulting in depolarization.
4. The closing of Na+ ions gates occurs and the opening of K+ ions takes place.
5. Repolarization occurs resulting in hyperpolarization.
6. With the closing of K+ gates, the returning of resting membrane potential takes place.
three (3) advantages of using a resource person in handling the First Aid lesson.
Answer:
Three advantages using a resource person in handling the First Aid lesson.
1. A resource person has expertise and adequate knowledge on First Aid and will be able to deliver.
2. A resource person can properly address questions arising from the First Aid Lesson.
3. Due to the experience of the resource person, he can give further practical issues on First Aid Lesson.
Explanation:
A resource person is an expert who is knowledge in particular field and contributes information and opinions to participants in a learning situation.
Such resource person will reveal challenges, successes, and frustrations associated with that particular field.
The 3 basic advantages of using the resource :
They must have adequate knowledge of first Aid and will be able to deliver.They can address questions arising.Must have experience and can give further practical issues on First Aid Lesson.What is a resource person?A resource person is a person that is well apt with the knowledge of the first and medical aid. He is able to deliver medical aid on time and can easily answer any question related to the medical aid.
They must possess the right set of ideas and must even have practice experience in handling the medical resources.
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Which step of the Scientific Method is most important? Explain.
Answer:
Problem, Purpose, or Research Question
Explanation:
The problem or research question is the single most important part of the scientific method. Every part of your project is done to answer this question.
animals from the most heavily populated ocean environments tend not to be preserved as fossils because
Answer:
It tends not to lock out enough oxygen to preserve organic material well.
Explanation:
Because some environments are more amenable to fossil preservation, the fossil ... For mineral shells of many marine invertebrates, "fixation" may be as simple ... this medium tends not to lock out enough oxygen to preserve organic material well.
I need help ! Can someone please help me out !
Answer:leo committed insurance fraud
Explanation:
what is the product of meiosis ll
The maintenance of normal volume and composition of extracellular and intracellular fluids is vital to life. List and briefly describe the kinds of homeostasis involved.
Answer:
Fluid Balance, Electrolyte Balance, Acid-Base Balance
Explanation:
The amount of fluids and the quantity of each are vital to the body for it to function properly. This is regulated by three kinds of homeostasis.
1- Fluid Balance : The balance of total liquids between the inside of the body and the outside environment so that the cells don't die.
2- Electrolyte Balance : The amount of electrolytes in the body must be kept at a level where the body's at a healthy pH level so that the nervous system and other functions that rely on neurological paths can continue.
3- Acid-Base Balance : It is required to be at a certain point so that the blood does not harm the kidney's and lungs and they can function properly.
I hope this answer helps.
If Adenine always pairs with Thymine and Guanine always pairs with Cytosine, what % of
DNA would be made up of Cytosine if 20% was made up of Adenine?
A. 20 B.30 C.40 D.60
Answer:
option b is correct
Explanation:
if adenine is 20% so thymine is also 20% because equal amount thymine and adenine make a base pair the remaining percentage is 60% which is contributed by cytosine and guanine so cytosine contribute 30% and cytosine also contribute 30%
______ were the first plants that did not require water for transferring sperm to eggs.
A) Bryophytes
B) Gymnosperms
C) Ferns
D) Angiosperms
Answer:
ferns
Explanation:
Water is absorbed through the root hairs by means of
Answer: by means of osmosis
Answer:
Through Osmosis
Explanation:
Plants absorb water from the soil by osmosis.
Root hair cells are adapted for this because they haveve a large surface area to speed up osmosis.
1. In relation to homeostasis, explain why a person with toxic goiter tends to sweat profusely.
2. Explain how the action of a peptide hormone is similar to the action of the neurotransmitter norepinephrine.
Answer:
In relation to homeostasis, explain why a person with toxic goiter tends to sweat profusely.
When there is hyper secretion of thyroid hormone in an individual a condition called toxic goiter occurs.Here the goiter swells at the neck region.Although this may pose no potential risk, but it maybe cancerous.
Thyroid hormones(T3,T4),increases calorinogenesis,that is they are carlorinogenic(,generate it in the body).This increases the oxygen consumption of the heart, and therefore overall body temperature.
To control the body temperature, the body thermo regulatory mechanisms set in, as the blood convey the heat to the thermo receptors in the hypothalamus. Vasodilation (widening of blood capillaries) occurs as the hypothalamus control the body temperature.
Therefore, as the heat leaves the body, through the capillaries close the the skin surfaces,the body need to produce sweat to conveyed the heat which cools the body temperature,hence sweating .
2. Explain how the action of a peptide hormone is similar to the action of the neurotransmitter norepinephrine.
This is because norepinephrine. act as hormones when secreted by Adrenal gland directly into the blood streams and as neurotransmitter when produced from the CNS and sympathetic nervous system.
Generally,from transcription by the DNA, peptide hormone are transcribed by the mRNA,and the protein is translated into corresponding proteins by the tRNA.And from this exhibited their dominant effects on the endocrine systems.
Generally, norepinephrine. is specific in mode of actions.It binds to specific receptor at the cell surfaces to produce it effects. Likewise peptide hormones are also receptor specific binding. Thus these are the similarities
Explanation:
Which is an example of codominance? (1 point)
roan coat color in horses
black and yellow coat color in Labrador retrievers
seed shape in pea plants
tall and short plant heights
Answer:
roan coat color in horses
Explanation:
Codominance is one of the Non-mendelian inheritance patterns in genetics i.e. does not follow Mendel's principles of inheritance. Codominance is a phenomenon whereby an allele is neither dominant nor recessive to another in a gene i.e. one allele is not phenotypically expressed over the other. Hence, both alleles are simultaneously expressed in their heterozygous state.
An example of codominance is the roan coat color in horses where the colored (B) and white (W) alleles are both dominant in the coat color gene, hence, the horse expresses both black and white coat phenotypes known as ROAN (BW). The black and white alleles are said to be CODOMINANT.
The roan coat color in horses is the example of codominance.
• The phenomenon in genetics in which neither of the allele masks the expression of the other allele is known as codominance.
• In this neither the dominant nor the recessive allele exhibit its dominance.
• It is a kind of inheritance in which the alleles of the pair of gene in a heterozygote are expressed fully.
• For example, in horse, roan coat color, is a pattern featured by an even mixture of white and colored hairs on the body.
• It is an even mixture of pigmented and white hairs that do not fade or gray out with age of the horse.
• Therefore, it exhibits the phenomenon of codominance as neither of the color of the coat masks the expression of the other, both are demonstrating their trait in the form of a mixture.
Thus, roan coat color in horses is an example of codominance.
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Which of the following is major characteristic of fungi that distinguishes them from other eukaryotes? Which of the following is major characteristic of fungi that distinguishes them from other eukaryotes? Cells with nuclei and mitochondria Sessile lifestyle Decomposition of dead organisms Acquiring nutrition through ingestion Nutrient acquisition via external digestion
Answer:
Nutrient acquisition via external digestion is the correct option.
Explanation:
Fungi are group of eukaryotic organisms that have no chlorophyll, heterotrophs, have cell walls made up of chitin and reproduce through spores.
Fungi get their food from organic compounds in the environment.
Fungi acquire their nutrients via external digestion because they did not ingest good substances into their body rather they release digestive enzymes into the food and digest it external. After that the food is absorbed from the external digestion.
Acquisition of nutrients through external digestion distinguishes fungi from other eukaryotes.
What is the mode of nutrition in fungi?Unlike algae fungi are heterotrophic, that is, they depend on food from their surroundings to attain energy. Like plants, they do not carry the process of photosynthesis as they lack chlorophyll. Unlike animals, fungi do not possess the tendency to ingest their food.
Fungi discharge certain kind of digestive enzymes into their food and digest it externally. They captivate the molecules of food, which they get by the process of external digestion. Fungi are able to digest food efficiently due to the presence of long and thread-like projections known as hyphae that surround and grow around the source of food.
Thus, the correct statement is nutrient acquisition through external digestion.
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Select all that apply. Which of the following are not properties of lipids? derived from fish, beans, milk, and eggs made up of steroids and phospholipids held together by peptide bonds deep, long-term storage of energy
Answer:
Hey there!
The correct answer would be "derived from fish, beans, milk, and eggs" and "held together by peptide bonds"
Let me know if this helps :)
Lipids are the bio-macromolecule that are soluble in hydrocarbons and are long-term storage of energy. Thus, options a and c are not the properties of lipids.
What are lipids?Lipids are the molecules involved in the biological functioning of the cell. They are organic compounds that are derivatives of fatty acids and include waxes, oils, and steroids.
They are the long term energy storage molecules and function as the chemical messenger in the body. The lipids consist of phospholipids and steroids that differ in function and structure.
The lipids are found in food containing corn, olive, seeds, nuts, fish, avocados, safflower, soy, etc. They are linked by the nonpolar covalent bonds due to their hydrophobic nature.
Therefore, the lipids are not held together by peptide bonds.
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23.
If you have a density of 2.5 g/mL and a mass of 5 g, what is the volume?
2 ml
2 cm³
Explanation:d = m/V => V = m/d
V = 5g/2.5g/ml
= 2 ml
= 2 cm³
Which of the following about the copperhead snake is true?
a. The copperhead snake is one of six venomous species in North America.
b. Copperhead snakes average 4.5 feet in length.
C. Copperhead snakes are not camouflaged.
d. Copperhead snakes detect heat given off by potential prey.
Answer:
d. Copperhead snakes detect heat given off by potential prey.
Explanation:
If a mutation occurred that increased the number of exons in a sequence of DNA, what impact would this have on the protein formed from the gene
Answer:
See the answer below
Explanation:
An increase in the number of exons in a sequence of DNA would result in another protein with a longer amino acid sequence.
Exons are the coding part of a gene as opposed to introns. After transcription, the non-coding part of the gene - the introns - are removed by splicing and the exons are joined back together. The final RNA that will undergo translation consists of only exons.
The longer the exons in a gene, the more the codons present in the corresponding mRNA from the gene, and the more the number of amino acids that would be translated from the mRNA. A longer amino acid chain would result in a different protein.
Hence, a mutation that causes an increase in the number of exons in a sequence of DNA would result in a different protein with a longer amino acid sequence.
What are 3 names that are important to the study of biology?
Answer:
Botany, Zoology and Microbiology
Explanation:
These are the main studies/branches of Biology.
1. How long has science been taking place?
Answer:
around 3500 to 3000 BCE.
Explanation:
Answer:
the earliest roots of science can be traced to Ancient Egypt and Mesopotamia in around 3500 to 3000 BCE
Pioneering work in the field of genetics began prior to the 20th century. However, much of the early work relied only upon simple observation
Select the genetics concepts below that were discovered before the year 1900.
a. preservation of beneficial traits
b. the location of genes on chromosomes
c. calculation of Mendelian inheritance
d. the molecular structure of DNA
Answer:
The Genetics Concepts Below That Were Discovered Before The Year 1900 Preservation Of Beneficial Traits The Location Of Genes On Chromosomes Calculation Of Pioneering work in the field of genetics began prior to the 20th century.
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What are physical properties? Give some examples.
Answer:
Physical property is defined as the property of a substance which can be measured without changing its chemical identity. Physical properties are observable properties of a substance. In other words, physical properties can be measured by watching, listening, feel, touch or smell.
Some examples of physical property are: Hard, soft, color, odor, and luster etcetera.
Would meteorology be a useful science to apply to the study of Mercury the innermost and smallest planet.. Explain !
Answer:
Yes, meteorology could be useful when studying other planets such as Mercury and Mars; atmospheric science has been extended to the field of planetary science and the study of the atmospheres of the planets of the solar system.
It would be ineffective since these two planets have extremely thin atmospheres. They experience very few meteorological processes.
What are meteorological processes?Weather or modifications in the Earth's atmosphere are examples of meteorological phenomena.
If you want to be a meteorologist a weather expert one should pursue a meteorological career. Fog, downpours, tornadoes, and hurricanes are examples of meteorological events.
Meteorology is essential because air quality has an impact on life. First and foremost, weather prediction is critical in urban management.
Cities are preparing for severe weather events such as tornadoes and snowstorms in order to avoid disasters. Second, agriculture relies on long-term weather forecasting.
Thus, as these celestial bodies have extremely thin atmospheres, it would be ineffective. They are subjected to very few meteorological processes.
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Compare plasma emission with fluorescence by indicating what is common and what is different for the two light emitting mechanisms.
Answer:
Plasma is a state of matter, generated when a gas of ions and atoms, have some of their orbital electrons and free electrons removed. Artificially, plasma can be generated by heating an electrically neutral gas, or subjecting the gas to a strong electromagnetic field until the gas becomes increasingly electrically conductive. This excited atoms and ions then emit electromagnetic radiation usually within the visible range, at wavelengths characteristic of the particular gas used, and are confined by a strong magnetic field.
On the other hand, fluorescence occurs when an excited molecule, atom, or subatomic particles like electrons relaxes to a lower energy state (possibly the ground state) by emitting energy in the form of a photon. It may have been directly excited from the ground state by absorbing energy in the form of a photon, subsequently emitting a photon of lower energy as it relaxes back to its initial lower state.
The common characteristics between these two phenomenon is that they both lead to the emission of energy in the form of photons, which is the unit of an electromagnetic energy or wave.
The difference is that plasma emission can only occur at a very high temperature, whereas fluorescence can occur at a wide range of temperatures between high and low temperatures.
Your friend Bruce calls in a panic. He has just come from the doctor and been diagnosed with a bacterial infection. The doctor told him not to worry; his B cells will take care of it in no time! Knowing that you are studying the immune response, he is calling to ask you to explain this statement. Is the doctor correct
Answer:
Answered below
Explanation:
B cells are a type of white blood cells of a subtype called lymphocytes. They confer acquired or adaptive immunity. This means that B lymphocytes responses to infective microbes are from the memories of their previous encounter with the microbes or antigens.
B lymphocytes fight bacteria and viruses by making Y-shaped proteins called antibodies. These antibodies are specific for each pathogen encountered. They identify and lock on to the surface of invading pathogenic cells and mark and present them for destruction by other immune cells.
Oftentimes, these antibodies are enough to fight off most bacterial infections that we have and therefore there's no need for extensive treatment with drugs.
The doctor is correct because B cells produce antibodies that recognize harmful bacteria, enabling them to be cleared from the human body.
B cells (also called B lymphocytes) are a fundamental type of white blood cell, which trigger protective antibody responses of the adaptive immune system.The plasma cells developed from a particular B cell generate specific antibodies that recognize specific antigens, which were bound to the B cell, generating immunological memory (i.e., antibody specificity).Antibodies generated by plasma B cells circulate in the bloodstream in order to recognize specific antigens present in bacteria, thereby enabling them to be cleared from the body.In conclusion, the doctor is correct because B cells produce antibodies that recognize harmful bacteria, enabling them to be cleared from the human body.
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Cells A and B receive the same high levels of stimulation, but Cell A shows a lower level of activity relative to Cell B. A likely explanation for this fact is that Cell A
Answer:
Cell A is laterally being inhibited by other neighbouring cells.
Explanation:
Cell A showing lower activity compare to cell B despite both having high simulation is because Cell A is surrounded by neighbouring cells and these neighbouring cells hinder the action potential of cell A through their numerous activity they perform around cell A.
Therefore they restrain the activities of cell A.
Thank you! Picture down below!
Answer:
22 ° C
Explanation
11. Describe the expedition that took place at Cheve Cave as described in
the "Race to the Center of the Earth" website. What challenges did the team
face?
Answer: Expedition took place to extend the cave beyond its initial limit of exploration
Explanation:
The expedition took place to extend the cave beyond its initial limit of exploration.
Why was the expedition a challenge for the team ?.As the expedition took place at the chevet cave which is described in the ace to the center of the earth. The expedition into the cave was full of challenges and hurdles. The team had to face a lack of oxygen, lack of light, and cold freezing water.
Thus the expedition was beyond the limits to explore the deep and mysterious place of the earth. As the cave is located in southern Mexico has a deepest point of about 1,536 meters and is the world's 11 deepest cave.
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The diagram shows the trophic levels in a lake on
a farm
Large-Sized
Fishes
Fishes, Crabs
(Larvae)
Zooplankton
Diatoms/Algae
Suppose the farmer sprays a field with a
chemical fertilizer. Based on the flow of energy in
the lake, which organisms would contain the
highest concentration of the chemical fertilizer?
A diatoms and algae
B.zooplankton
C. fishes and crabs
D. large-sized fishes
Answer:
D. large-sized fishes
Explanation:
The energy flow in the trophic level from highest to lower level is as follows:
Large-Sized Fishes => Fishes and Crabs (Larvae) => Zooplankton => Diatoms/Algae.
The concentration of toxics or chemical substance increases from lower level (primary producers) to highest level, so the organism at apex contain highest concentration of chemical fertilizer.
In this example, large-sized fishes have highest concentration of chemical fertilizer.
Hence, the correct answer is D. large-sized fishes.
Write one scientific question about the organism in the photo.
Answer:
How does the bird's long beak help it survive?
Explanation:
It could be to crack nuts or to help dig up bugs. This should work unless the question needs to be about cells and stuff.
Answer:
How long can a bird fly before taking a break
Explanation:
Which of the following blood components is involved in reducing blood loss from a damaged blood vessel?
A) Erythrocyte.
B) Platelet.
C) Lymphocyte.
D) Basophil.
E) Neutrophil.
Answer:
The correct answer is B
Explanation:
Platelet: "a small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting."
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- Which of the following is least likely to lead to the formation of turbidity currents and submarine canyons?
A. A large hurricane
B. An underwater earthquake
C. A change in sea surface temperature
D. A tsunami
Answer:
C
Explanation: