RAT #8 - Chromosome Structure

Question 1

A gene can be defined as a segment of DNA that codes for:

a. messenger RNA
b. a functional product
c. messenger RNA or ribosomal RNA
d. a protein

Answer 1

b. a functional product

Question 2

“beads on a string” refers to?

a. 2nd order of chromatin structure
b. 1st order of chromatin structure

c. heterochromatin
d. 3rd order of chromatin structure

Answer 2

b. 1st order of chromatin structure

Question 3

What is Chromatin?

DNA + protein

DNA + RNA
RNA + protein
DNA + RNA + protein

Answer 3

DNA + protein

Question 4

What protein structure organizes DNA in nucleosomes and/or chromatosomes?

a. Helicases
b. Topoisomerase
c. Histones
d. Bridge proteins

Answer 4

c. Histones

Question 5

Euchromatin consists of?

a. is 300 nm in size

b. Decondensed, Transcriptionally Active Chromatin
c. Highly Condensed, Transcriptionally Inactive Chromatin

d. Looped-Solenoid form of Chromatin

Answer 5

b. Decondensed, Transcriptionally Active Chromatin

Question 6

{True / False}

Heterochromatin gets its name from the fact that it contains a mixture of active and inactive genes.

Answer 6

FALSE

Question 7

{True / False}

Interaction between the Finger-like Projections of Histones with DNA is based on a CHARGE Attraction.

Answer 7

TRUE

Question 8

Kinetochores are the:

a. structures at the base of cilia and flagella

b. regions where two chromosomes remain attached during mitosis c. same as centromeres
d. sites of spindle fiber attachment to chromosomes

Answer 8

d. sites of spindle fiber attachment to chromosomes

Question 9

A chromosome is made up of __________ genes?

a. two
b. large numbers of

c. one
d. several

Answer 9

b. large numbers of (genes)

Question 10

One long DNA molecule is found in each?

a. Nucleus
b. Nucleosome
c. Chromosome
d. Gene

Answer 10

c. Chromosome (?)