Deck 4: Genes, genomes, and DNA

Question 1

Homologous chromosomes .

A)are the same length
B)have the same genes at the same loci
C)pair up during cell division
D)are all of the above.

Answer 1

D

Question 2

Alu elements represent of the human genome.

A)less than 1%
B)4-5%
C)6-8%
D)more than 10%

Answer 2

C

Question 3

The most common form of DNA is A-DNA.

Answer 3

False

Question 4

Type II topoisomerases .

A)break both strands of DNA
B)include DNA gyrase,for example
C)change the linking number in steps of two
D)are all of the above

Question 5

Topoisomerases .

A)are antibiotics that kill bacterial cells
B)bend DNA
C)change the level of supercoiling in DNA
D)repair DNA

Question 6

All of the following describe Z-DNA except .

A)left-handed helix
B)12 base pairs per turn
C)acid conditions
D)GC- or GT-rich tracts

Question 7

The melting temperature of DNA is the temperature at which .

A)half of the two strands are separated.
B)the two DNA strands are completely separated.
C)the DNA is completely degraded.
D)half of the DNA is degraded.

Question 8

The form of DNA that consists of a triple helix promoted by acid conditions and runs of purine bases is called .

A)H-DNA
B)Z-DNA
C)A-DNA
D)B-DNA

Question 9

Which of the following sequences would have the highest melting temperature relative to the others listed?

A)5'-ATATATAT-3'
B)5'-GAGAGAGA-3'
C)5'-GCGCGCGC-3'
D)5'-AAAAAAAA-3'

Question 10

DNA wrapped around histones are called .

A)chromatids
B)nucleosomes
C)heterochromatin
D)300 nm fibers

Question 11

Compared to the other answers listed,which is the least compacted structure?

A)DNA double helix
B)chromatid
C)30 nm fiber
D)nucleosome

Question 12

A large amount of satellite DNA is found .

A)in euchromatin
B)around the centromeres of chromosomes
C)in loosely packed forms of chromatin
D)in Alu elements.