Exam 6: DNA Structure, Replication, and Recombination

Two strains of S.cerevisae (yeast)are crossed.One has the genotype ABC and the other abc.Five sets of the resultant tetrads are noted below.In which set did a gene conversion event occur?

The step of DNA replication in which the replication proteins open up the double helix and prepare for complementary base pairing is called

X-ray data showed that the DNA helix undergoes one complete turn every

________ bonds are responsible for the chemical affinity between A and T (or G and

________-form DNA spirals to the right and is the major form of naturally occurring DNA molecules.

During meiotic prophase in a eukaryotic cell, Spo11 initiates recombination by causing a double-strand break in DNA between Gene A and Gene B on one sister chromatid.Which of these events will occur prior to formation of a Holliday junction?

Crossing-over that occurs only between two specific DNA target sites that are usually less than 200 base pairs long is called

The four subunits that make up DNA are called

Which of the following is not involved in ensuring the accuracy of replication of a cell's genetic information?

If 35% of the bases in a region of the mouse genome are cytosine, what percentage in that region are adenine?

Z-form DNA is a ________ helix with ________ backbone.

Which of the following properties of RNA is most directly responsible for its ability to form complex shapes?

The process of ________ is extremely important in generating genetic diversity.

Two strains of S.cerevisae (yeast)are crossed.One has the genotype A B and the other a b.Which statement correctly describes the tetrads that can be produced by one reciprocal exchange without gene conversion in the dihybrid?

The molecule of heredity is usually

The antiparallel polarity of the two DNA strands within the double helix affects DNA replication in that

During early interphase the structure of a eukaryotic DNA chromosome is

Meselson and Weigle grew one strain of bacteriophage lambda with alleles A and B in heavy isotopes and another strain with alleles a and b in light isotopes.Both loci are located near the end of the viral chromosome.Which statement best describes their results and conclusions?

In eukaryotic cells, replication proceeds from ________ origin(s)of replication.

The protein that progressively unwinds DNA ahead of each replication fork is called