<span>Since alkylating agents work to prevent the cell from replicating its genetic material, the cell would most likely stop at the interphase checkpoint, which is the phase before mitosis (which consists of prophase, metaphase, anaphase, and telophase). During interphase, the cell replicates its genetic material (DNA), but this would be prohibited by alkylating agents.</span>
Answer:
<h2>
AAUAA deletion- (B
)
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Poly(A) tail deletion- (C)
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5' cap deletion- (A)
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Explanation:
(A) introns are not removed from the pre-mRNA due to 5' deletion;
(B) the pre-mRNA is not cleaved at the cleavage site due to AAUAA deletion
(C) the mRNA is not transported to the cytoplasm due to poly A tail deletion;
AAUAA deletion: if we delete the AAUAA sequence then there is the change of sequence of pre- mRNA that the pre-mRNA is not cleaved at the cleavage site
.
Poly(A) tail deletion: Poly(A) tail is the long tail of Adenine in the 3' end of mRNA, after the deletion of Poly(A) tail, it affects the transport of mRNA from the nucleus to the cytoplasm and the mRNA is not transported to the cytoplasm if tail is deleted.
5' cap deletion; the effect of 5' cap deletion is that introns are not removed from the pre-mRNA. The process of intron removing and exon joining is called RNA splicing.
In metaphase, anaphase and telophase of meiosis 2 before cytokinesis the condition prevails.
<h3><u>Explanation:</u></h3>
Meiosis is the type of cell division which takes place in the gamete mother cells to produce gametes. Its a reduction division because the germ mother cells are diploid and gametes are haploid.
In the cells undergoing the meiotic cell division, the cells at first undergo DNA replication which make the DNA content of each chromosome doubled.
Then through meiosis 1, the cell undergo the reduction division which makes the diploid cell haploid. So here the cell with 10 chromosomes become cell with 5 chromosome. But the DNA content per chromosome remains doubled. This is restored by the second meiosis division where the chromosome becomes divided into chromatids with normal DNA amounts.
So in every steps of meiosis 2, untill the cytokinesis is achieved, the cell remains in the haploid yet double DNA amount condition.
Answer: CHANNEL PROTEINS provide openings in the plasma membrane for substances to flow through without changing structure, and CARRIER PROTEINS allow passage of substances through the plasma membrane after undergoing a subtle change in shape.
Explanation: They are described thus:
A channel protein is a protein that allows the transport of specific substances across a cell membrane.
Carrier proteins are proteins that carry substances from one side of a biological membrane to the other. Many carrier proteins are found in a cell’s membrane, though they may also be found in the membranes of internal organelles such as the mitochondria, chloroplasts, nucleolus, and others.
