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21 Jun 2018

Which of the following would not inhibit a cell from entering S phase?

a.) an absence of G1 CdK

b.) condensation of chromosomes

c.) centromere replication

d.) mitosis

e.) cytokinesis

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Sixta Kovacek
Sixta KovacekLv2
24 Jun 2018
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Related questions

(A) What is the correct order of cell cycle phases? Select one:

a. G1 to S to G2 to M phase b. M to G2 to S to G1 phase c. none of these d. G1 to G2 to S to M phase e. G1 to M to S to G2 phase

(B) What cyclin-cdk complex is critical in mitosis? Select one:

a. Cyclin E - cdk2 b. cyclin E - cdk1 c. cyclin A - cdk 2 d. cyclin B - cdk1 e. cyclin D cdk 4

(C) Which of the following proteins is progressively phosphorylated throughout the cell cycle from G1 through to M phase? Select one:

a. E2F1 b. pRb c. RNA polymerase II d. cyclin D e. cyclin B

(D) An antibody generated from a mouse hybridoma cell line is called a mouse ________. Select one:

a. anticlonal antibody b. polyclonal antibody c. synclonal antibody d. none of these answers e. monoclonal antibody

Part A:

In prokaryotes and eukaryotes cell reproduction is similar in that it requires some kind of signal to proceed, DNA replication, careful separation of the DNA into two equal portions, and division of the cytoplasm. How is cell reproduction different in prokaryotes and eukaryotes?

Select one:

a. In a eukaryotic organism, the signals for cell division are usually not related to the environment but to the function of the entire organism.

b. Eukaryotic cells constantly divide whenever environmental conditions are adequate and the cells are large enough.

c. The linear chromosomes in prokaryotes are constantly being updated.

d. Prokaryotic cell division requires cytokinesis before mitosis because of their small size.

e. The sexual phase of most prokaryotes (bacteria) is essential to the rapid cell division required for infection.

Part B:

What does the name Cyclin Dependent Kinase stand for?

Select one:

a. A protein important to the cell cycle that is dependent on DNA synthesis.

b. An enzyme that cuts DNA so that chromosomes can segregate.

c. An enzyme that phosphorylates other proteins using ATP only when the protein Cyclin is bound to the enzyme.

d. An enzyme that rolls along microtubules dragging a vesicle.

e. An enzyme that connects chromosomes to the spindle fiber.

Part C:

The Cell Cycle is divided into Mitosis, Cytokinesis, and Interphase. Mitosis can be ordered into the following phases:

Select one:

a. Prophase/Prometaphase/Metaphase/Anaphase/Telophase

b. Anaphase/Prometaphase/Metaphase/Prophase/Telophase

c. Metaphase/Anaphase/Telophase/Prophase/Prometaphase

d. Telophase/Prophase/Prometaphase/Metaphase/Anaphase

e. Anaphase/Telophase/Prophase/Prometaphase/Metaphase

Part D:

The Cell Cycle is divided into Mitosis, Cytokinesis, and Interphase. Interphase can be ordered into the following phases:

Select one:

a. S/G1/G2

b. G2/G1/S

c. G1/S/G2

d. G2/S/G1

e. G1/G2/S

A)

In order to move from G1 to S-phase…

Select one:

a. Cyclin-Cdk must phosphorylate cytochrome c, thereby inactivating it.

b. Cyclin-Cdk must phosphorylate cytochrome c, thereby activating it.

c. Cyclin-Cdk must phosphorylate RB, thereby inactivating it.

d. Cyclin-Cdk must phosphorylate ADP to make enough ATP for all that DNA synthesis.

e. Cyclin-Cdk must phosphorylate RB, thereby activating it.

B)

How is meiosis different than mitosis?

Select one:

a. Meiosis is found only in juvenile organisms while mitosis is found at all life stages.

b. Cytokinesis is skipped during meiosis but not during mitosis.

c. During anaphase II of meiosis chromosomes segregate randomly while in mitosis they do not.

d. Meiosis is uncontrolled while mitosis is rigorously controlled.

e. During metaphase I of meiosis homologous chromosomes pair up together and in mitosis they do not.

C.)

“Crossing over” during meiosis leads to…

Select one:

a. the exchange of DNA on a maternal chromosome for DNA on paternal chromosome.

b. free radical formation and DNA damage.

c. incomplete formation of chiasmata.

d. many mitotic errors and mutations.

e. transcription and translation.

D)

“Non-disjunction” during meiosis leads to…

Select one:

a. robust, mutation-proof gametes.

b. parthenogenic reproduction.

c. larger zygotes.

d. the wrong number of chromosomes in the daughter cells.

e. is important for generating heritable genetic variability.

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