Answer:
The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
The structure of cell membrane helps in being selectively permeable that play a major role in regulating the entry and exit of molecules into and out of the cell.
The cell membrane is a biological membrane that makes the barrier between the interior of all cells and the outside environment. It is composed of a phospholipid bilayer with embedded proteins.
Due to phospholipid bilayer that has hydrophilic heads toward outside and intercellular matrix and hydrophobic tails in the middle, it is selectively permeable to ions and organic molecules:
It forms a physical barrier between the cell and the external environmentselected necessary molecules to pass through itregulates the entry and exit of molecules into and out of the cell. permits the entry of vital molecules like water, oxygen and amino acids, glucose into the cellthese molecules are crucial for various life processesmetabolic waste products are expelled through the cell membrane.it provides signals from one cell to another.Thus, the major function of cell membrane is due to its structure.
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Identify the two gases exchanged between the body and the air during respiration explain how this gas exchange happens.
Answer:
The two gases involved in gas exchange are oxygen and carbon dioxide. Oxygen from the air is absorbed by the blood, and carbon dioxide is released. This gas exchange occurs in the alveoli.
Explanation:
This is what i did thank you have a nice day ☺️
The two gases exchanged between the body and the air during respiration are Carbon dioxide and oxygen.
What is respiration?Respiration is defined as a metabolic process wherein, the living cells of an organism obtains energy (in the form of ATP) by taking in oxygen and liberating carbon dioxide from the oxidation of complex organic substances.
The human body is designed to exchange gases with the external environment or atmosphere. The external environment consists of numerous gases and oxygen being a vital gas is an essential part of the body.
Thus the exchange of gases in the human body takes place through the lungs and exchange takes place between the oxygen which is taken in and carbon dioxide is given out.
Million of alveoli in the lungs work to make it happen. Hence these gases are Carbon dioxide and water.
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PLEASE HELP ME I WILL MARK BRAINLY IF CORRECT!!!!
A student rests his right ear against his desk while a
teacher taps lightly on the desk. The student can hear the
tapping sound only through his right ear. When he lifts his
head away from the desk, he hears nothing.
What is the medium of the sound waves the student hears?
A. The air
B. The student
C. The desk
D. The teacher
Answer:
The desk
Explanation:
the desk is the answer because the sound wave is propagating through the solid bench.
Hope this is right.,,
How much of your DNA came from your mother? How much from your father?
Answer:
50/50
Explanation:
your DNA consist of your fathers and mothers DNA and the cool thing is that you get half of both
Answer:
50% of your DNA should be from your mother, and the other 50% should be from your father.
Which macromolecule is known to be hydrophobic?
Carbohydrates
Lipids
Proteins
Nucleic Acids
help(again)! will mark brainliest!
Answer: energy
Explanation:
where does glycolysis and krebs cycle take place in the cell
Answer:
In most animal cells, glycolysis takes place in the cytoplasm and the krebs cycle takes place in the mitochondria.
Hope this helps
Answer:
glycolysis occurs in the cytoplasm while krebs cycle occurs in the mitochondria
Explanation:
Mitosis is responsible for growth, repair, and maintenance in an organism because
A. it occurs at a faster rate than meiosis
B. The chromosomes number is reduced by half
C. exact duplicates of each mother cell are produced
D. it is the only process involves replication of genetic material
Mitosis is responsible for growth, repair and maintenance of an organism because it produces all the daughter cells that are genetically identical to one other and therefore creates new available cells that are specific to each tissue for growth and repair.
Hope this helps! Please correct me if I'm wrong!
2. (a) Read through the following passage about mitosis and then complete
it by writing the most appropriate word or words in the spaces.
In flowering plants the process of mitosis is restricted to the apical
and to
In growing mammals
mitosis can occur throughout the body.
However, not all regions of the young mammal grow at the same
rate and this is called
growth.
In the cell cycle, replication of DNA occurs in the..
.............phase,
after which there is a lag or gap phase, called the
phase,
before actual mitosis starts. The chromosomes also replicate before the
onset of mitosis, but this replication is not visible until the middle of the
. stage.
At this stage, each chromosome consists of two
..held
together by a
Answer:
This question is incomplete
Explanation:
This question is incomplete but there are some general facts that can be made.
Firstly, mitosis only occurs in meristematic tissue of plants which includes apical and lateral meristems
There are 4 phases in a cell cycle
1) G1 (gap 1) phase: This is the first phase of the cell cycle that has to do with an increase in the size of the cell. Major cellular components duplicate in size here.
2) S-phase: DNA replication occurs here.
3) G2 (gap 2) phase: This is the gap phase that comes after the S-phase. The cell undergoes further growth here and the organelles of the cells are also prepared for cell division.
4) Mitotic phase: There are four stages here
i) prophase: Chromosome condenses and becomes visible at this stage. And there is the emergence of spindle fibre from centrosomes.
ii) metaphase: Spindle fibre develops and sister chromatids are attached to
separate spindle.
iii) anaphase: Cohesin, which holds two sister chromatids (of chromosomes) together, breaks down and are pulled towards opposite poles.
iv) telophase: Chromosomes begins to decondense at opposite poles and actual cell division starts as mitotic spindle breaks down.
NOTE: All possible answers to the question are underlined
how the structures of the different chambers and vessels of the heart relate to their functions.
Answer:
Explanation:
The heart can be found at the center of the chest, underneath the sternum in a thoracic compartment. It is made up of four chambers and several valves that regulate the normal flow of blood within the body.
Two chambers called atria are located in the upper portion of the heart and receive oxygen-free blood. The valves that separate these chambers are called atrioventricular valves which is composed of the tricuspid valve on the left and the mitral valve on the right.
On the other hand, ventricles are chambers found on the lower portion of the heart; they pump oxygen-enriched blood into all organs of the body, reaching even the smallest cells. Similar to the atria, the ventricular chambers are also separated by valves. Collectively-termed as semilunar valves, these are comprised of the pulmonary and aortic valve.
The heart also has a wall that is composed of three layers: the outer layer epicardium (thin layer), the middle layer myocardium (thick layer), and the innermost layer endocardium (thin layer). The myocardium is think because it is made up of cardiac muscle fibers.
The structure of the heart is made more complex because of the mechanisms that allow blood to be distributed throughout the body and to return into the heart. Facilitating this continuous process are two types of blood vessels: veins and arteries (16jacktwinwritters). The vessels that bring oxygen-free blood back into the heart are called veins; those that bring oxygen-rich blood away from the heart and to other body parts are called arteries. Functioning in the left ventricle, the largest artery is called aorta. The aorta is considered a main artery in the body. It further splits into two smaller arteries called common iliac arteries.
With regular functioning, the heart is continuously able to supply sufficient amount of oxygen to all parts of the body.
HELP!!! What carries O2 and nutrients to tissue and carries metabolic waste away from tissues?
A. Circulatory
B.Digestive
C. Endocrine
D.Nervous
Answer:
the answer should be digestive
Explanation:
What carries O2 and nutrients to tissue and carries metabolic waste away from tissues?
digestive
What is the form of fibronectin produced by liver cells and where is it found in the body ?
Answer: Fibronectin exists as a protein dimer formed of two monomers linked by a pair of disulfide bonds. Soluble and insoluble types of fibronectin exist. The soluble form is found in the blood, participates in wound healing processes, and is produced by hepatocytes.
Explanation: I have an a+ in biology however if this doesn't work I am very sorry
❤
List three types of fertilization with a description.
Answer:
oviparity, ovoviparity, and viviparity
Explanation:
oviparity- expulsion of undeveloped eggs rather than live young. The eggs may have been fertilized before release, as in birds and some reptiles, or are to be fertilized externally, as in amphibians and many lower forms.
ovoviparity-embryos develop inside eggs that remain in the mother's body until they are ready to hatch.
viviparity- , retention and growth of the fertilized egg within the maternal body until the young animal, as a larva or newborn, is capable of independent existence
Answer:
Oviparity- fertilized eggs are laid outside the females body and develop there.
ovoiparity- eggs that have been fertilized before being released.
viviparity- development of embroy inside the mother
Explanation:
hope this helps (:
How is genetic variation passed to offspring?
Answer: through somatic cells or inherited through the germaine.
Explanation: My best guess
What were the results of van Helmont's
experiments?
A. Plants gain their mass from water
B. Plants gain their mass from soil
C. Plants produce oxygen during photosynthesis
Please help, 10 points
Answer: A
Van Helmont concluded that most of the mass the plant gained had come from water.
Please help! ASAP AND THANK YOU!
Answer:
C
Explanation:
it is because the source of the energy is the stove's burner, and it is not from the cooking pot. The cooking pot only absorb the heat from the stove's burner to make sure the vegetables is well-cooked
Dry matters is made up of organic matter and?
Diet for an adolescent has to be a __________________ one.
Answer:
balanced
Explanation:
Do not write
outside the
box
9
Figure 12 shows exchange surfaces in the lungs.
Figure 12
Oxygen
Cell at lung surface
Blood vessel
Red blood cell
(transports oxygen)
09
1
Explain how one feature shown in Figure 12 increases the rate of oxygen uptake
by the blood.
[2 marks]
Answer:
Red blood cells - help in transporting oxygen other all the body parts. _ halp to increase the tamprecature in the all the body parts
One pesticide, called was popular for killing mosquitoes that
carried the deadly disease malaria. (3 Letters)
Answer:
DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations.
Explanation:
Brainliest please?
A jockey feeds a carrot to his horse first thing in every morning. The horse now "neighs" every morning when it sees the jockey. Neighing is a(n)_____ response to the carrot provided by the jockey, an ________ stimulus.
Answer:wlwka'klfj'lj'lksjflkel'sej'lefkj'skl 'skf'selkf's;kf'lsl;kf';slk
Explanation: dorry i was slamming my head o my key board XD
Answer:
A jockey feeds a carrot to his horse first thing in every morning. The horse now "neighs" every morning when it sees the jockey. Neighing is a(n) _*learned*_ response to the carrot provided by the jockey, an _*external*_ stimulus.
Which of the following statements is true regarding active transport?
A. It does not use any of its own energy.
B. It uses some of its own energy.
C. It uses energy from other cells.
D. It uses the energy stored mainly in the nucleus.
Answer:
I think c
Explanation:
active transport uses energy from ATP which is not found in the nucleus. so we know it uses energy which is not it's own and ATP is not apart of the nucleus so that leaves c
NEED HELP PLEASE ALOT OF POINTS
6. Use the following terms to complete the statement: resilient, resistant If an ecosystem is _____________ was just still working can you check where she is copypasta hi Gigi what asked you i like, it is generally stable unless drastically changed by a disturbance. When a The disturbance causes a change, the ecosystem quickly recovers when it is _____________
Explanation:
Resistant means it can withstand changes, so I suppose the 1st blank
Resilient means it can recover quickly, so the 2nd blank
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What is the most important topographic feature of the ocean floor? Why?
Answer:
hi
Explanation:
The important features are the extensive continental shelves less than 250 m deep (pink); the vast deep ocean plains between 4,000 and 6,000 m deep (light and dark blue); the mid-Atlantic ridge, in many areas shallower than 3,000 m; and the deep ocean trench north of Puerto Rico (8,600 m).
Where do plants get the nitrogen they need to create amino acids and DNA?
Answer:Assimilation - This is how plants get nitrogen. They absorb nitrates from the soil into their roots. Then the nitrogen gets used in amino acids, nucleic acids, and chlorophyll.
Explanation:
If the gametes produced by a given organism contain 6 chromosomes, how many chromosomes are found in that organism's body cells? (4 points) 3 6 12 10
hi
gamete are reproduction cells. They carry only half of the DNA materials
for the merger with an other gamete celle from the opposite sex.
so if a gamete carries 6 chromosomes, normal load of other cells is 12
If the gametes of a given organism contain only 6 chromosomes then in that same organism's body cells, the number of chromosomes will be 12. Thus, the correct option is C.
What are Chromosomes?A chromosome is a long molecule of DNA with some part of it or all of the genetic material of an organism. Most of the eukaryotic chromosomes contain packaging proteins called histone proteins which are aided by chaperone proteins in the nucleus, that bind to and condense the DNA molecules present in the nucleus to maintain its integrity. The DNA molecule is a long thread which is several meters in length.
The chromosome content of gamete cells is half than the parent cell. It is because they are produced from meiosis. The male and female gametes combine in fertilization to form the zygote which is diploid (2n). Here, the chromosomal content of gametes is 6 i.e., haploid (n) thus the chromosomal content of body cells will be 12 (2n).
Therefore, the correct option is C.
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Don’t mind the answer I put. Pls help
Answer:
Hemoglobin, or red blood cells, are primarily transporters of oxygen. These cells receive oxygen as air is breathed in through the lungs. Oxygen binds itself to these cells, which then carry it to the heart. The heart circulates the oxygenated blood to cells throughout the body in the process of cellular respiration.
Explanation:
Hope this is helpful, Have a Great Day/Night!!
Which effects would many organisms likely experience if global warming occours check all that apply
Disrupted food webs
Increased competition
Increased number of glaciers
Disrupted life cycle events
Forced relocation
Answer:
A. disrupted food webs B. increased competition D. disrupted life-cycle events E. forced relocation
In a paramecium, the nucleus divides first and then the cytoplasm divides, forming two identical daughter cells. Which type of reproduction takes place in paramecia?
Answer:
This type of reproduction is called binary fission.
Explanation:
Binary fission is a type of reproduction in paramecium that involves producing two identical daughter cells from one mother cell. These daughter cells are called clones, and are not genetically distinct from their progenitor. No genetic exchange is involved and they are genetically indequingishable.
The resulting DNA is identical to the original copy and newly copied chromosomes separate into two identical daughter cells with the same chromosome number. All offspring remain identical.
The products of cellular respiration are of photosynthesis 0 products O unrelated O reactants O depends on the process
Answer:
reactantsExplanation:
Respiration is a catabolic process that releases energy from chemical bonds within carbohydrates. It occurs in mitochondria for aerobic processes, and produces carbon dioxide and water, and uses O2 and glucose as reactants...
C6H12O6 (glucose) + 6 O2 → 6 CO2 + 6 H2O + ≈38 ATP
Photosynthesis is a form of biosynthesis in producers such as plants, bacteria and fungi- they convert solar energy into stable chemical energy. The process uses the products of respiration in biosynthesis...
6CO2 + 6H20 + (energy) → C6H12O6 + 6O2
The reactions are cyclic- they feed into each other.
Natural selection refers to all of the following EXCEPT
Answer:
Darwin proposed the theory of natural selection to explain the process of evolution. According to Darwin’s theory of natural selection, all organisms have the potential to reproduce limitlessly irrespective of the fact that each species maintain a constant density over time. However, the struggle for existence, i.e. the competition among individuals for available resources to survive and reproduce, put a check on species density (D) and maintains it at a constant level (B). Survival of fittest is unequal ability of individuals to survive and reproduce based on suitability of their inherited characters to prevailing environmental conditions (A). It imparts the reproductive advantage to certain organisms which account for major part of the gene pool of the species. Thus, natural selection favors the individual with survival and/or reproductive advantage over others under existing environmental condition (E). Thus, the correct answer is option C.