Question

1.

Which of the following is true about binary fission?

Group of answer choices

A the original two chromosomes in a bacterial cell each replicate and are placed into two new cells

B the chromosome is copied, then attaches to the cell membrane by spindle fibers

C there is no nuclear membrane to break down and reform

D lysis of the existing cell wall of bacteria occurs during the process

2.

DNA:  

Group of answer choices

A replication is described as semi‑conservative because only half of the DNA amount is replicated in each cell cycle

B would have a high Tm if the G/C content is high

C replication would have DNA gyrase (or Topoisomerase II) acting behind the replication fork during DNA replication

D all are correct

3.

Which of the following is true concerning histones or related structures?

Group of answer choices

A if viewed by electron microscopy, the octamer looks like “squares on a rope”

B a nucleosome contains two copies H2A, H2B, H3, and H4 plus DNA

C the octomer is H1, H2A, H2B, and H4

D histones are involved primarily in control of transcription

4.

Euchromatin:

Group of answer choices

A is transcriptionally active chromosomal DNA

B will stain heavily due to increased condensing of the DNA

C cannot be replicated during DNA duplication

5.

The DNA of an organism has 40% C bases. What percent of its bases would be T bases?

Group of answer choices

A 30%

B 40%

C 10%

D 60%

6.

When adenylyl cyclase is activated:

Group of answer choices

A cAMP is broken down into its components of a sugar, a phosphate and a nitrogen base

B cAMP is formed

C calcium ions are released from intracellular stores

7.

Using polyethylene glycol (PEG), early G1 phase cells were fused with S phase cells. Of the following events, which would you expect to be induced in the G1 cells as a result of the fusion?

Group of answer choices

A spindle fiber formation

B cytokinesis

C condensation of chromosomes

D mitosis

E DNA replication

Answer 1

Question 1) answer is c) there is no nuclear membrane to break down and reform.

Binary fission occurs in bacteria. And since it is a prokaryote, it does not have any membrane bound organelles. So no nuclear membrane break down and reformation is involved during binary fission.

Note to student- Please do post the rest of the questions as separate questions and I shall answer them for you. Or if you have a specific doubt related to a topic, then do let me know in the comments and I shall clear it in the comments. Thanks.