Exam 13: Dna and Its Role in Heredity

Watson and Crick used three-dimensional representations of the possible molecular structure of DNA to determine its actual structure. This process is called _______.

Experiments designed to identify the "transforming principle" were based on

The first repair of mistakes during DNA replication is made by

During DNA replication

The material that changed R strain pneumococcus into the virulent S strain was originally referred to as the _______.

The nitrogenous bases classified as purines are _______ and _______.

Evidence of the semiconservative nature of DNA replication came from

If a double-stranded DNA molecule contains 30 percent T, it must contain _______ percent G.

In many eukaryotes, there are repetitive sequences at the ends of chromosomes called telomeres. After successive rounds of DNA replication, the _______ strand becomes shorter. In some cells, an enzyme called _______ repairs the shortened strand.

The enzyme that restores the phosphodiester linkage between adjacent fragments in the lagging strand during DNA replication is

In the Hershey-Chase experiment,

Chargaff observed that the amount of _______ was roughly equal to the amount of _______ in all tested organisms.

A deoxyribose nucleotide is a

Which of the following represents a bond between a purine and a pyrimidine (in the correct order)?

A deoxyribonucleoside is a

Which statement about complementary base pairing is not true?

An enzyme that is found in 90 percent of human cancers and may be responsible for the continuous division of cancer cells is _______.

Which of the following statements about DNA replication is false?

Which of the following statements about the molecular architecture of DNA is true?

An alien DNA-like molecule is isolated from the frozen remains of a life-form found beneath the Martian polar ice caps. In this sample, for every base designated Q, there is twice that amount of base R; for every base Z, there is twice that amount of base S. If the molecule contains 33.33 percent R, what percentage of Z would you expect?