Answer:
Genetic variation mechanisms are different in prokaryotes and eukaryotes, Transformation, transduction, and conjugation in prokaryotes whereas crossing over, random assortment, and random fertilization in eukaryotes.
Prokaryotes:
Prokaryotic cells can lead to genetic variation by recombining their genetic material. In prokaryotes, horizontal gene transfer (HGT), in which gene transfer from one organism to another in the same generation. The three most common ways of HGT are transformation, conjugation, and transduction.
Eukaryotes:
Eukaryotic organisms can perform either sexual and asexual or both reproduction in which they are able to transfer genetic material (DNA) to their offsprings. Such transfer of genetic material process is called vertical gene transfer. In sexually reproducing organisms, independent assortment during zygote formation, a mutation in genes, and crossing over during prophase 1 in meiosis is the process that increases the chances of genetic variation.
Palm trees grow in warm climates. The climate in Alaska where the scientist found the fossil is very cold. Since the palm tree died millions of years ago, what is most likely true about the Alaska's climate?
Z 00m 336"083"2553 (wZE2XQ)
What was one major effect of urbanization on British society during the
Industrial Revolution?
O A. Urban citizens were forced to drink unsanitary and polluted water.
B. Improved living conditions resulted in a decline in the mortality
rate.
O C. Governments passed strict regulations to reduce the levels of
pollution.
D. Wealthy corporations relocated their factories to rural areas.
Answer:
B is the answer
B. Improved living conditions resulted in a decline in the mortality
rate.
Hope it helps
The major effect of urbanization is improved living conditions resulted in a decline in the mortality rate during industrial revolution.
What is industrial revolution?The Industrial Revolution was the shift to new industrial methods in the United Kingdom, continental Europe, and the United States from around 1760 until between 1820 and 1840.
The major effect of urbanization is improved living conditions resulted in a decline in the mortality rate during industrial revolution.
Thus, the correct option is B.
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A researcher crossed two plants, and informed an assistant researcher to determine the genotypes and phenotypes of the plants that were crossed by analyzing the offspring. The assistant counted 30 plants with green pods and 10 plants with yellow pods. Which of the following conclusions can accurately be made by the assistant?
a. The researcher had selfed a true-breeding plant with green pods.
b. The researcher had crossed true-breeding plants of differing pod colors.
c. The researcher had crossed two heterozygous plants.
d. The researcher had crossed two plants with yellow pods.
e. The researcher had crossed a plant with green pods to a plant with yellow pods.
Answer:
c. The researcher had crossed two heterozygous plants.
Explanation:
Due to technical problems, you will find the complete explanation in the attached files.
Complete each sentence with the correct word or phrase
a. An action potential reaches the axon terminal causing __________to open.
b. Acetylcholine diffuses across the synaptic cleft before binding to its receptor, which is located on the _____
c. When the membrane potential reaches ________an action potential spreads across the sarcolemma due to the opening of ___________
d. In response to acetylcholine binding, ________ move into the muscle fiber causing the membrane potential to rise.
Answer:
a). Voltage-gated Ca2+ channels
b). the motor end plate
c). Threshold, voltage-gated Na channels
d). sodium ions
Explanation:
a). The voltage-gated [tex]Ca^{2+}[/tex] channels are the key transducers of the membrane potential that changes into a intracellular [tex]Ca^{2+}[/tex] transients which initiates the physiological events. When the action potential makes a contact with axon terminal, the voltage-gated [tex]Ca^{2+}[/tex] channels opens.
b). The acetylcholine is the main neurotransmitter of the parasympathetic nervous system. It helps in blood vessels dilation, muscle contraction, and perform many more functions.
It diffuses with the synaptic cleft that is located on the motor end plate of the nervous system.
c). The membrane potential is also known as the membrane voltage or the transmembrane potential. When it recaches the threshold, the voltage-gated Na channels opens to spread the action potential across sarcolemma.
d). The sodium ions in case of acetylcholine binding moves to the muscle fiber due to which the membrane potential rises.
Old is Gold - B.Sc. 2nd year 203
2074/What is mutation? Explain different types of mutation involving changes in
chromosome number and chromosome structure?
Answer:
Mutation is the changing of the structure of genes resulting in a varied form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes.
A silent mutation is a mutation where the codon still corresponds to the same amino acid. The sequence of amino acids is not changed so the protein that gets made is the same as the wild type, or normal protein.
A missense mutation changes the codon so that it codes for a different amino acid.
Finally, a nonsense mutation causes protein creation to stop early, which makes a non-functioning protein.
Substitution means that one base is exchanged for another. This is kinda like having a substitute teacher. The sub isn't your normal teacher, but they are still a teacher. A protein that is made with a substitution might still function normally, or it could be nonfunctional.
Deletion is kinda self-explanatory. It happens when a base is deleted or, in other words, is just missing.
Finally, insertion means an extra nucleotide is added.
Explanation:
Hope it helps .
A sample of 100 students shows that 16 have smooth chins (recessive allele to cleft chin). Calculate the number o heterozygous students.
How do somatic and Inherited mutations differ?
O A. Somatic mutations exist in all cells in the body and Inherited mutations only exist In the cell type that mutated.
O B. Inherlted mutations exist in all cells in the body and somatic mutations only exist In the cell type that mutated.
O C. Somatic mutations only affect males and inherited mutations affect any gender.
O D. Inherited mutations only affect males and somatic mutations affect any gender.
4. Which statement is true of all biotic factors?
A. They are alive
B. They are renewable.
C. They use photosynthesis.
D. They use chemosynthesis.
Answer:
option a
Explanation:
Answer:
The answer is A
Explanation:
Biotic factors are living organisms in the ecosystem.Examples are animals,birds,fungi
What is the result of a mutation during meiosis
Answer:
There's a change in the DNA sequence
Explanation:
If a mutation occurs in cells that will make gametes by meiosis or during meiosis itself, it can be passed on to offspring and contribute to genetic variability of the population. Mutations are the sole source of genetic variability that can occur in asexual reproduction. But the effects of mutations can vary widely, from being beneficial, to having no effect, to having lethal consequences, and every possibility in between.
You are a research biologist working at the U.S. research station in Antarctica. You discover a new single-celled organism that is able to survive in the frigid conditions. During your research you observe that the organism has a nucleus. Which domain would this new organism be classified into
Answer: Eukarya.
Explanation:
The cell is the functional and morphological unit of all living beings. Organisms can be classified as follows: if they are composed of a single cell, they are called unicellular (such as protozoa or bacteria which are microscopic organisms), or mutlicellular if they have more cells.
The three-domain system is a biological classification into three groups:
Archaea Bacteria Eukarya.It is based on the differences found in the sequence of the ribosomal RNA of the minor subunit to conclude that these groups developed separately from a common progenitor.
Archaea are a group of unicellular prokaryotic microorganisms that have no nucleus or any internal membranous organelles. However they are different from bacteria, so that they form their own domain.
Bacteria are prokaryotic microorganisms that do not have a defined nucleus nor do they generally have internal membranous organelles.
Although archaea and bacteria are morphologically very similar, archaea are closer to eukaryotes in some genes and pathways of transcription and translation. Thanks to studies of genetic material, now we knot that the evolution of archaea and bacteria had been independent, so archaea could no longer be considered as a group of bacteria. However, the Archaea and Bacteria domains include prokaryotic organisms, i.e. those whose cells do not have a differentiated cell nucleus.
The Eukarya domain includes the best known and most complex forms of life (protists, animals, plants and fungi). It includes organisms formed by cells with a true nucleus. These organisms consist of one or more eukaryotic cells, ranging from unicellular to multicellular organisms in which the different cells are specialized for different tasks and which, in general, cannot survive in isolation.
So, if the observed organism possesses a nucleus, then it is a eukaryote.
Short Answer Questions
What TWO things are necessary for evolution by natural selection to
occur?
3.3
Predict the possible genotypes of offspring if two roan heterozygous
polled cattle were mated
Answer:
RR, Rw, Rw, ww
Explanation:
Rw
R
w
RR, Rw, Rw, ww
The phenotypes would be 1 Red, 2 Roan, and 1 white, assuming the colors of roan are white and red and red is dominant white is recessive, hope that helps!
during chemosis what substance diffuse from one side to other side of the membrane
Answer:
During chemosis,transport chain substance diffuse from one side to other side of the membrane.
what's the right blood cell
How are meiosis and mitosis similar?
Answer:
b
Explanation:
they both produce new cells.
Answer:
heyyy
B is the answer
they produce new cell
ONE FOOD CHAIN that was affected by the introduction of wolves and model it
Answer:
Carnivorous
Explanation:
The wolf, also known as the gray wolf or grey wolf, is a large canine native to Eurasia and North America. More than thirty subspecies of Canis lupus have been recognized, and gray wolves, as colloquially understood, comprise non-domestic/feral subspecies.
Match the structural formula to the chemical formula for this substance.
Hн
но-с-с-он
ІІ.
Hн
C2H2(OH)2
ООО
HOC2OH
С2Н6O2
O H4CO3H2
Answer:
C2H6O2
Explanation:
Just did it on edge...
Answer:
C2H6O2
Explanation:
Edge 2021
What is the
nature of water molecules makes that able to absorb heat and moderate our
climate.
The morphogical characteristics of plant plantain...
Answer:
gbcghhhhbhhhhhhhhhhgffggh
Melanie has had a recent cold with symptoms of runny nose, sneezing, coughing, congestion, and malaise. Today, she is concerned that she has a sharp pain in her chest. She goes to see her health care provider, and is diagnosed with costochondritis, an inflammation in the cartilage between the ribs. From your reading related to cellular injury and adaptations as well as inflammation, answer the following questions:
a. What anatomic problem most likely leads to costochondritis?
b. What is the injury in costochondritis?
c. What would the acute inflammatory response look like?
Answer:
a. Viral infections may lead to inflammation between the ribs (i.e., costochondritis)
b. Viral infection
c. Viral infection may lead to the influx of chemical mediators (cytokines), increased blood flow, and movement of plasma and white blood cells (leukocytes) from the blood into the injured site
Explanation:
Costochondritis is a painful condition caused by the inflammation of the cartilage that joins the ribs to the breastbone (this joint is known as the “costochondral joint”). Costochondritis is caused by inflammation of the costochondral joint, which may be triggered by multiple causes including, among others, viral/bacterial/fungal infections, exercise or strenuous activity, chest trauma, osteoarthritis, presence of tumors, etc. Acute inflammation is the immediate immune response of the body to harmful stimuli (e.g., viral infections), which is characterized by the increased movement of white blood cells (such as neutrophils and macrophages) that rapidly travel from the blood into the injured area. This plasma contains chemical mediators like pro-inflammatory cytokines which are secreted from immune cells (e.g., Th1 cells, CD4+ cells, macrophages) in order to promote inflammation.
Spatial perception and the recognition of familiar objects require activity in which of the following cortical regions?
a. Auditory association areas
b. Primary olfactory cortex
c. Visual association areas
d. Orbitofrontal cortex
Answer:
c. Visual association areas
Explanation:
The visual association areas are part of the cerebral cortex and are responsible for allowing human beings to have special perception, movement perception, visual perception processing and recognition of familiar objects. These areas are extremely important for the maintenance of human activities, and the deterioration or disturbance of these causes serious problems, difficult to be resolved.
A phosphate group has the following chemical composition:
a. -OH
b. -COOH
c. -PS2
d. -CH3
e. -PO4
Answer: The phosphate group has the chemical composition [tex]-PO_{4}[/tex].
Explanation:
A phosphate group is a group where one phosphorus atom is attached to four oxygen atoms.
The oxygen atoms are attached to the phosphorus atom via single bond and one oxygen atom is attached to the phosphorus atom via double bond.
The chemical formula which represents a phosphate group is [tex]-PO_{4}[/tex].
Thus, we can conclude that phosphate group has the chemical composition [tex]-PO_{4}[/tex].
8
Michelle has been given a microscope slide that contains a eukaryotic cell and a prokaryotic cell. What should she look for to
distinguish the eukaryotic cell from the prokaryotic cell?
OA.
ribosomes
ОВ.
cell membrane
OC.
nucleus
OD
cytoplasm
Reset
Next Question
Answer:
Nucleus
Explanation:
Because an only prokaryotic cell has a true nucleus
Earth's biosphere is described as
the zone of life. The sum of all life on Earth.
Factors determine energy a human being requires in a day
PLEASE HELP ASAP!!!!!
Answer:B andC
hope it helps
Without replication, organisms could not successfully
move.
grow and reproduce.
feed.
make proteins.
Answer: grow and reproduce
Explanation:
Where do stars form?
Answer:
Stars are formed within clouds of dust...
Explain why you would recommend the nguni cattle meat to consumers in your locality.
Answer:
Below
Explanation:
All different combinations were catalogued in the beginning of the century by a South African herdmaster. This work inspired the Nguni Cattle Register, a compilation of terms to describe in full a Nguni cow or bull. The cattle are medium-sized, with bulls weighing between 500 and 600 kg,[3] while cows weigh between 300 and 400 kg.