Biology - Chapter 8: Cell Reproduction (bd)

In order to fit within a cell, a DNA becomes more compact by...

• breaking apart into separate genes.

• extending to form very long, thin molecules.

• wrapping tightly around associated proteins.

• being enzymatically changed into a protein.

Chromatids are...

• dense patches within the nucleus.

• bacterial chromosomes.

• duplicate halves of a chromosome.

• prokaryotic nuclei.

A protein disk that attaches two chromatids to each other in a chromosome is called a...

• chloroplast.

• centromere.

• gamete.

• centriole.

Tags

NGSS.HS-LS1-4

Which of the following is not a true difference between the chromosomes of eukaryotes and those of prokaryotes?

• Eukaryotic chromosomes are linear, while those of prokaryotic are circular.

• Eukaryotic chromosomes are found free in the nucleus, while those of prokaryotes are attached to the cell membrane.

• Eukaryotes usually have more than one chromosome, while prokaryotes have only one chromosome.

• Eukaryotic chromosomes contain DNA, while prokaryotic chromosomes contain a different form of genetic material.

The chromosomes in your body...

• exist in 23 pairs.

• include two sex chromosomes.

• include 44 autosomes.

• all of the above

A student can study a karyotype to learn about the...

• molecular structure of a chromosome.

• genes that are present in a particular strand of DNA.

• medical history of an individual.

• number of chromosomes present in a body cell.

A diploid cell is one that...

• has two homologues of each chromosome.

• is designated by the symbol 2n.

• has chromosomes found in pairs.

• all of the above

diploid : body cell :: haploid :

• sex chromosome

• chromosome

• reproductive cell

• zygote

Tags

NGSS.HS-LS3-2

The diploid number of chromosomes in a human skin cell is 46. How many chromosomes are in a human egg cell?

• 46

• 92

• 23

• 12.5

How many chromosomes are in the body cells of an organism that has a haploid number of 8?

• 4

• 8

• 12

• 16