Purine Pyrimidine DNA

In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?

• DNA contains sulfur, whereas protein does not.

• DNA contains phosphorus, whereas protein does not.

• DNA contains nitrogen, whereas protein does not.

• DNA contains purines, whereas protein includes pyrimidines.

Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine? 

• 8%
• 16%
• 31%
• 42%

In an analysis of the nucleotide composition of DNA, which of the following will be found? 

• A = C 
•  A = G and C = T 
• A + C = G + T 
• G + C = T + A

What is meant by the description "antiparallel" regarding the strands that make up DNA? 

• The twisting nature of DNA creates nonparallel strands. 
• The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. 
• Base pairings create unequal spacing between the two DNA strands.
• One strand is positively charged and the other is negatively charged. 

An Okazaki fragment has which of the following arrangements? 

• primase, polymerase, ligase 
•  3' RNA nucleotides, DNA nucleotides 5' 
• 5' RNA nucleotides, DNA nucleotides 3' 
• DNA polymerase I, DNA polymerase III 

Which enzyme catalyzes the elongation of a DNA strand in the 5' → 3' direction?

• primase 
• DNA ligase 
• DNA polymerase III 
• topoisomerase 

Which of the following provides some evidence that RNA probably evolved before DNA? 

• RNA polymerase uses DNA as a template.
• RNA polymerase makes a single-stranded molecule. 
• RNA polymerase does not require localized unwinding of the DNA. 
• DNA polymerase uses primer, usually made of RNA. 

The two strands of a DNA molecule are held together by

• hydrogen bonds

• phosphodiester bonds

• glycolsyl bonds

• glycosidic linkages

Tags

NGSS.HS-LS1-1

DNA is a polymer made of monomers called

• nucleotides

• ribosomes

• purines

• pyrimidines

Tags

NGSS.HS-LS1-1

The term used to describe DNA replication is

• semi-conservative

• conservative

• antiparallel

• dispersive