Chapter 12 Quiz 1

There are (a)______________ chromosomes in every human body cell. These chromosomes are always in pairs. The two members of each pair of chromosomes are called (b)______________. One member of each pair of chromosomes comes from the male parent. The other member comes from the female parent.

• (a) 23；(b) chromatid

• (a) 46；(b) chromatid

• (a) 23；(b) homologous chromosomes

• (a) 46；(b) homologous chromosomes

Human body cells have two sets of chromosomes, and each set has (c)______________ chromosomes. Cells with two sets of chromosomes are described as (d)______________ cells. Human gametes (sperms and eggs) have only one set of chromosomes, and are therefore described as (e)______________ cells.

• (c) 23；(d) haploid；(e) diploid

• (c) 46；(d) diploid；(e) haploid

• (c) 23；(d) diploid；(e) haploid

• (c) 46；(d) haploid；(e) diploid

The photomicrographs show four stages of the cell cycle in a plant cell.
The correct sequence of the four stages is:

• P → Q → R → S

• Q → P → R → S

• Q → R → P → S

• S → P → Q → R

The photomicrographs show four stages of the cell cycle in a plant cell.

Stage Q accounts for the longest time in the cell cycle.

• True

• False

The photomicrographs show four stages of the cell cycle in a plant cell.

DNA replication occurs during stage Q.

• True

• False

The photomicrographs show four stages of the cell cycle in a plant cell.

New organelles are formed during stage Q.

• True

• False

The photomicrographs show four stages of the cell cycle in a plant cell.

Spindle fibres are formed during stage Q.

• True

• False