BIOLOGY HIGH SCHOOL

Spermatogonia in the seminiferous tubules are located ________.

Answers

Answer 1
Answer: Here is the answer:

Spermatogonia which is located in the seminiferous tubules are located  closest to the lumen of the tubule. Spermatogonia refers to spermatogenic cells and the sperm that are produced through spermatogenesis happen inside the seminiferous tubules which is located within the testes.

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Which lists the correct order of evolutionary history?

Answers

The lists of the correct order of evolutionary history is Jellyfish, Reptiles, Mammals. This three are classified as vertebrates and all I know that almost all the animals we know are vertebrates. Jellyfish is a fish that do not have a backbones, example of reptiles is garter snake, there are so many mammals in the forest such as bat, rodent, bear and much more.
the answer is d
jellyfish, reptiles, mammals

Which statement is one component of the cell theory?

Answers

The options attached to the question above are given below:

A. All living and nonliving things consist of one or more cells.

B. Cells and living organisms are spontaneously created.

C. Cells are the most complex unit of structure and function in living things.

D. A cell is the basic unit of structure and function of all organisms

ANSWER

The correct option is D.

The cell theory is one of the major theories in biology and it states the facts about living cells. The theory states that, the cell is the most basic unit of all organisms and all living organisms are made up of one or more cells. The organisms that are made up of only one cell are described as unicellular while those that possess many cells are described as multi cellular. The theory also states that all cells come from pre-existing cells.



the correct answer is d

According to Mendel’s law of dominance, which statement best describes the result of a cross between parents with genotypes Rr and Rr?

Answers

Answer:

C: All offspring with at least one R will have red flowers.

Explanation:

Mendel's Law of Dominance states that: “In a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are hybrid for a trait will have only the dominant trait in the phenotype.”

This simply means that if there exists two contrasting traits (I.e Rr), one of the traits will always suppress the other, thereby expressing itself. R suppresses r, thus making the offspring with big R have red flowers. The trait is called a dominating trait and the suppressed is called recessive trait.

Write a paragraph about how one would go about eradicating malaria in West Africa.

Answers

Answer:

Africa needs to urgently put a number of additional measures in place to speed up these advances, and to move towards eliminating the disease. These include accelerated investment and deployment of vaccines, new diagnostic tools, new funding strategies for malaria control and keeping in check the drug and insecticide resistance challenge.

Explanation:

Which is the purpose of transfer RNA?a. to code for protein synthesis
b. to carry the synthesized genetic information from the nucleus to the ribosomes
c. to synthesize proteins from RNA
d. to bring amino acids to the ribosomes to be assembled into proteins

Answers


a. to code for protein synthesis

RNA, also known as Ribonucleic acid, is the molecule that is used when coding and decoding genetic information. It similar to DNA and is assembled as a chain of nucleotides. An error in the coding of RNA can lead to the mutation of the genetic information or DNA. This means that the protein will not function as it should and lead to genetic defects in a species. Probably the best example of this is Down's Syndrome. This occurs in humans when there is an extra chromosome in the DNA.


to bring amino acids to the ribosomes to be assembled into proteins

Given the nucleotide sequences below, what type of mutation has occurred?Before:

A C C G T A T G T C A T

After:

A C C G T A A G T C A T



deletion


insertion


substitution


mixer

Answers

Answer: Substitution

Reasoning: In the DNA strand, we have taken a letter out and put in another letter to see what happens. This method is called substitution, when we take something out, and put a new piece in. 
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