Exam 10: Molecular Biology of the Gene

A eukaryotic cell has a nuclear envelope that allows tRNA molecules, but not mRNA molecules, to leave the nucleus. Which of the following processes will not be able to take place in this cell?

Dilated cardiomyopathy (DCM) is a common cause of sudden death and heart failure. Many mutations can cause DCM, but several of them are linked to the protein troponin, which is an essential protein that helps regulate muscle contraction in the heart. -A mutation in troponin that has been linked to DCM is A159E, in which the amino acid A is replaced by the amino acid E. The middle portion of the exons (template strand of DNA) that contain the code for the wild-type A and the mutant E are shown in the accompanying table. Assuming that the reading frame starts with the first triplet, what is the codon for A? Wild-type ATGCGTTAGCTC Mutant ATGCTTTAGCTC

The way that genetic material of a bacteriophage enters a bacterium is most like the way that

How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?

Multiple origins of replication on the DNA molecules of eukaryotic cells serve to

Which of the following statements is false?

Exposure to the HIV virus doesn't necessarily mean that a person will develop AIDS. Some people have genetic resistance to infection by HIV. Dr. Stephen O'Brien from the U.S. National Cancer Institute has recently identified a mutant form of a gene, called CCR5, that can protect against HIV infection. The mutation probably originated in Europe and became more prevalent among survivors of the bubonic plague. The mutated gene prevents the plague bacteria from attaching to cell membranes and, therefore, from entering and infecting body cells. Although the HIV virus is very different from the bacteria that causes the plague, both diseases affect the exact same cells and use the same method of infection. The presence of the mutated gene in descendants of plague survivors helps prevent them from contracting AIDS. Pharmaceutical companies are using this information as the basis for a new approach to AIDS prevention. This could be very important in areas of the world where the mutation is scarce or absent, such as Africa. -Which of the following shows the steps of a viral infection in the proper order?

If one strand of DNA is CGGTAC, then the complementary strand would be

Which of the following is a function of a tRNA molecule?

Which of the following takes place during translation?

Which of the following statements characterizes the lytic cycle of a viral infection?

Which of the following statements regarding DNA is false?

Conjugation between a bacterium that lacks an F factor (F−) and a bacterium that has an F factor on its chromosome (F+) could produce which of the following results?

Which of the following occurs when RNA polymerase attaches to the promoter DNA?

Normal genes have a promoter followed by a start codon. In a mutant gene, the "A" in the start codon has been deleted. Which of the following is not a possible outcome?

Which of the following statements regarding the flow of genetic information is false?

The copying mechanism of DNA is most like

Which of the following statements about ribosomes is false?

When a bacterial cell with a chromosome-borne F factor conjugates with another bacterium, how is the transmitted donor DNA incorporated into the recipient's genome?

The "one gene-one enzyme" hypothesis states that