Chapter 16 Mastering Biology Quiz

the enzyme that can replicate DNA

DNA polymerase

what kind of chemical bond is found between paired bases of the DNA double helix? a. covalent b. hydrogen c. sulfhydryl d. phosphate e. ionic

b

At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork: 3' C C T A G G C T G C A A T C C 5'An RNA primer is formed starting at the underlined T (T) of the template. Which of the following represents the primer sequence? a. 3' G C C T A G G 5' b. 5' G C C U A G G 3' c. 5"A C G U U A G G 3' d. 5' A C G T T A G G 3' e. 5' G C C T A G G 3'

c

What determines the nucleotide sequence of the newly synthesized strand during DNA replication? a. the arrangement of histones in the sugar phosphate backbone b. the relative amounts of the four nucleoside triphosphates in the cell c. the nucleotide sequence of the template strand d. the primase used in the reaction e. the particular DNA polymerase catalyzing the reaction

c

Which of the following best describes the addition of nucleotides to a growing DNA chain? a. A nucleoside diphosphate is added to the 3' end of the DNA, releasing a molecule of phosphate. b. A nucleoside diphosphate is added to the 5' end of the DNA, releasing a molecule of phosphate. c. A nucleoside triphosphate is added to the 3' end of the DNA, releasing a molecule of pyrophosphate. d. A nucleoside monophosphate is added to the 5' end of the DNA. e. A nucleoside triphosphate is added to the 5' end of the DNA, releasing a molecule of pyrophosphate.

c

Cytosine makes up 38% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine? a. 31 b. 24 c. 38 d. 12 e. It cannot be determined from the information provided.

d

after the replication is complete, the new DNAs, called what are identical to each other?

daughter DNA

What is meant by the description "antiparallel" regarding the strands that make up DNA? a. Base pairings create unequal spacing between the two DNA strands. b. One strand contains only purines and the other contains only pyrimidines. c. The twisting nature of DNA creates nonparallel strands. d. One strand is positively charged and the other is negatively charged. e. The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. Submit

e

the new DNA strand that grows continuously in the 5' to 3' direction

leading strand

short sections of DNA that are synthesized on the lagging strand of the replicating DNA

okazaki fragments

during DNA replication, an open section of DNA, in which a DNA polymerase can replicate DNA, is called what?

replication fork