The following step in cell cycle takes most of the time to complete activities a

Question

The following step in cell cycle takes most of the time to complete activities associated with it: A) Propphase B) Metaphase C) Telophase D) Interphase E) G1 phase Cells of the following organ do not undergo cell cycle, but retain ability to divide when needed: A) Kidney B) Liver C) Skin D) Brain E) Pancreas The following techniques was used to provide evidence that messages are present in the cytoplasm of mammalian cells in order to regulate cell cycle: A) cell fusion B) Southern blot hybridization C) Sanger's method of DNA sequencing D) RNAi technique E) Gene cloning What causes the decrease in the amount of cyclin at a specific point in the cell cycle? A) an increase in production once the restriction point is passed B) the cascade of increased production once its protein is phosphorylated by Cdk C) the changing ratio of cytoplasm to genome C) its destruction by a process called ubiquitylation E) the binding of PDGF to receptors on the cell surface

Explanation / Answer

1.d. This phase takes about 80 percent of the time required to complete the cell cycle. During cell division, the nucleus disappears after prophase. Cell division does not take a long time.Prophase is the longest phase of mitosis, but it occurs faster thaninterphase. Anaphase is the shortest phase of mitosis.

4.d.Cell fusion occurs during differentiation of muscle, bone and trophoblastcells, during embryogenesis, and during morphogenesis.

A Southern blot is a method used in molecular biology for detection of a specific DNA sequence in DNA samples.

Sanger sequencing, also known as the chain termination method, is a technique for DNA sequencing based upon the selective incorporation of chain-terminating dideoxynucleotides (ddNTPs) by DNA polymerase during in vitro DNA replication.

RNA interference (RNAi) is a biological process in whichRNA molecules inhibit gene expression or translation, by neutralizing targeted mRNA molecules. Historically, it was known by other names, including co-suppression, post-transcriptional gene silencing (PTGS), and quelling.

Gene cloning is the process in which a gene of interest is located and copied (cloned) out of DNA extracted from an organism.

Now regulation of cell cycle is mainly done by CDK and cyclins.These are not their in any of the option .Hence RNA i technology may be some extent used for this as it is the most close option to the control of gene expression or thus it can be concluded to control the cell cycle.

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