Quiz 2

Question 1

Cell division plays several important roles in the lives of organisms?

Answer 1

• replaces damaged or lost cells,
• permits growth, and
• allows for reproduction.

Question 2

Mitosis is the type of cell division responsible for

Answer 2

• asexual reproduction and
• growth and maintenance of multicellular organisms.

Question 3

Sexual reproduction requires

Answer 3

fertilization of an (haploid)egg by (haploid)a sperm to form a zygote (diploid)

Question 4

Histones are

Answer 4

proteins used to package DNA

Question 5

Nucleosomes consist of

Answer 5

DNA wound around
histone molecules

Question 6

What are the types of mutation?

Answer 6

Missense mutations, Nonsense mutation, and Frameshift mutation

Question 7

Dawn syndrome is?

Answer 7

Ans. Also known as trisomy 21 in which there are 3 chromosomes in chromosome 21 resulting in 47 chromosomes.

Question 8

.Cancer that move beyond the origin is?

Answer 8

Metastasis

Question 9

One function of tRNA is?

Answer 9

it has anticodon that read the codon in mRNA and translate it to it’s matching amino acid.

Question 10

During interphase, a cell…

Answer 10

• performs its normal functions,
• doubles everything in its cytoplasm,
• grows in size.

Question 11

During G1….

Answer 11

each chromosome is single, and the cell performs its normal functions.

Question 12

During S…..

Answer 12

DNA synthesis

Question 13

During G2…..

Answer 13

each chromosome in the cell consists of two identical sister chromatids, and the cell prepares to divide.

Question 14

The mitotic (M) phase includes two overlapping processes:

Answer 14

Mitosis
Cytokinesis

Question 15

Mitosis definition….

Answer 15

nucleus and its contents divide evenly into two daughter nuclei

Question 16

Cytokinesis definition…

Answer 16

cytoplasm is divided in two.

Question 17

mitotic spindle….

Answer 17

football-shaped structure of microtubules that guides the separation of the two sets of daughter chromosomes.

Question 18

Cytokinesis happens during….

Answer 18

Telophase

Question 19

In animal cells, cytokinesis

Answer 19

is known as cleavage and
• begins with the appearance of a cleavage furrow, an indentation at the equator of the cell.

Question 20

Crossing over is….

Answer 20

the exchange of corresponding segments between nonsister chromatids of homologous chromosomes

Question 21

nondisjunction is….

Answer 21

the members of a chromosome pair fail to separate at anaphase, producing gametes with abnormal numbers of chromosomes

Question 22

The four nucleotides found in DNA differ in their nitrogenous bases. The bases can be divided into two types.

Answer 22

1. Thymine (T) and cytosine (C) are single-ring structures.
2. Adenine (A) and guanine (G) are larger, double- ring structures.