15. Cinnabar eyes is a sex-linked, recessive characteristic in fruit flies. If a female having cinnabar eyes is crossed with a wild-type male, what percentage of the F1 males will have cinnabar eyes?
(A) 0%
(B) 25%
(C) 50%
(D) 100%

11. A drug designed to inhibit the response of cells to testosterone would most likely result in  ________.(A) lower cytoplasmic levels of cAMP (B) a decrease in transcriptional activity of certain genes (C) an increase in cytosolic calcium concentration (D) a decrease in G protein activity

12. Motor proteins require which of the following to function in the movement of chromosomes toward the poles of the mitotic spindle? (A) intact centromeres (B) a microtubule-organizing center (C) ATP as an energy source (D) synthesis of cohesin

13. A female with a paternal set of one orange and one long gene chromosome and a maternal set comprised of one blue and one short gene chromosome is expected to produce which of the following types of eggs after meiosis? (A) All eggs will have maternal types of gene combinations. (B) All eggs will have paternal types of gene combinations. (C) Half the eggs will have maternal and half will have paternal combinations. (D) Each egg has a one-fourth chance of having either blue long, blue short, orange long, or orange short combinations.

14. Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division? (A) prophase I of meiosis (B) anaphase II of meiosis (C) metaphase II of meiosis (D) anaphase I of meiosis

16. What is the role of DNA ligase in the elongation of the lagging strand during DNA replication? (A) It synthesizes RNA nucleotides to make a primer. (B) It joins Okazaki fragments together. (C) It unwinds the parental double helix. (D) It stabilizes the unwound parental DNA.

17. An original section of DNA has the base sequence AGCGTTACCGT. A mutation in this DNA strand results in the base sequence AGGCGTTACCGT. This change represents  ________.(A) a missense mutation (B) a point mutation (C) a silent mutation (D) frameshift mutation

18. Imagine that you've isolated a yeast mutant that contains histones resistant to acetylation. What phenotype do you predict for this mutant? (A) The mutant will grow rapidly. (B) The mutant will require galactose for growth. (C) The mutant will show low levels of gene expression. (D) The mutant will show high levels of gene expression.

19. Which of the following human diseases is caused by a virus that requires reverse transcriptase to transcribe its genome inside the host cell? (A) herpes (B) AIDS (C) smallpox (D) influenza

20. A laboratory might use dideoxyribonucleotides to  ________.(A) separate DNA fragments (B) produce cDNA from mRNA (C) sequence a DNA fragment (D) visualize DNA expression

21. When gene duplication occurs to its ultimate extent by doubling all genes in a genome, what has occurred? (A) pseudogene creation (B) creation of a gene cluster (C) creation of a polyploid (D) creation of a diploid