Exam 13: Dna and Its Role in Heredity

In the 1920s, a dye that stained DNA was developed.If this dye showed that DNA was present in 4 units in a gamete of an organism, how many units of DNA would be present in a somatic cell of that organism?

In Griffith's experiments, the S cells caused disease, but the R cells did not, because the R cells lacked an enzyme that catalyzes the synthesis of a _______.

If the end of one of the sequences that you wish to amplify by PCR begins with TGTCGAT, the primer should _______ with _______.Note: All sequences are shown in the 5-to-3 orientation.

Explain how the Hershey and Chase experiment demonstrated that DNA is the genetic material.

The maximum amount of C in a double-stranded molecule of DNA is 50 percent.If the C is at this maximum, there are no As or _______ in the DNA molecule.

Given the DNA sequence shown, what would the opposite (3-to-5) strand sequence be? 5-GCTAACTGTGATCGTATAAGCTGA-3

If 30 percent of the bases in a double-stranded DNA molecule are T, _______ percent must be G.

Refer to the chemical formula of dideoxycytidine. The drug dideoxycytidine, used to treat certain viral infections, is a nucleotide made with 2,3-dideoxyribose.This sugar lacks -OH groups at both the 2 and the 3 positions.This drug stops the growth of a DNA chain when added to DNA because

In any sample of double-stranded DNA, _______ percent of the bases are purines.

In which mode of replication would fragments of both strands serve as the templates for generating two molecules from one double-helix DNA?

DNA polymerase can only elongate preexisting polynucleotide strands.What problem does this create?

Which base pairing represents a bond between a purine and a pyrimidine (in that order)?

According to the Watson and Crick model for the structure of DNA, _______ are on the outside and _______ are on the inside of the double-stranded DNA molecule.The strands run _______.

If 23 percent of the bases in a sample of double-stranded DNA are adenine, what percentage of the bases are uracil? a. 0 b. 23 c. 27 d. 50 e. 73

Refer to the figure, which shows DNA replication. Which diagram (A or B) depicts the process of DNA replication that occurs in human cells?

In the positive control experiment run by Avery and his team, pure DNA from a cell-free extract containing the transforming substance was shown to cause _______ transformation.

Suppose the actual transforming substance had been found to be protein and not DNA.Which scenario would be expected to produce a transformation that would cause mice to become sick?

Using the following information, calculate the number of origins of DNA replication on a human chromosome: DNA polymerase adds nucleotides at 3,000 bp per minute in one direction; replication is bidirectional; S phase lasts 300 minutes; there are 120 million bp per chromosome.In a typical chromosome 3 m long, how many origins are there per micrometer?

The nitrogenous bases classified as purines are adenine and _______.

The Hershey and Chase experiment proved that