Question

21. Which of the following techniques is most likely to lead to heteroplasmy?

Select one:

a. cytoplasmic (ooplasmic) donation

b. embryo adoption

c. in vitro fertilization

d. preimplantation genetic diagnosis

22. Identifying combinations of _______ alleles is useful in tissue typing, establishing identity, and estimating disease risk.

Select one:

a. HIV

b. CCR5

c. HLA

d. antibody

23. A gene expression microarray has:

Select one:

a. an entire genome of DNA, cut into hundreds of pieces, attached to a small plastic or glass square.

b. short pieces of DNA of known sequence attached to a small plastic or glass square.

c. several human genes sent into bacterial cells, and the cells allowed to divide.

d. amino acids attached to a small plastic or glass square.

24. Freezing oocytes has not been very successful because:

Select one:

a. they undergo an extra meiosis.

b. the woman can become dangerously cold.

c. ice crystals can form in the abundant, watery cytoplasm.

d. the nuclei shatter.

25. In normal differentiated somatic cells, telomerase:

Select one:

a. adds material to the ends of chromosomes with each cell division to keep them immortal.

b. is not expressed and telomere tips erode with each division until the cell dies via apoptosis.

c. turns off tumor suppressor genes.

d. repairs double strand breaks in DNA.

Answer 1

Answer 21. Pre implantation genetic disorder

Answer 22. HLA

Answer 23. Amino acid attached to a plastic and glass square.

Answer 24. Nuclei shatter

Answer 25. Is not expressed and telomere tips erode with each division until the cell dies via apoptosis.