BIOL 214 Exam 2 2020/2021 Questions and Answers

BIOL 214 Exam 2 2020/2021 Questions and Answers 1. A homologous chromosome pair is best described as two chromosomes having . a. the same genes in the same order but possibly having different alleles of those genes b. the same alleles of the same genes in the same order c. the same alleles of the same genes in a different order d. different alleles of the same genes arranged in a different order e. identical DNA sequences 2. What is the difference between sister chromatids before and after anaphase II? a. Before anaphase II, the sister chromatids are separate; after anaphase II, the sister chromatids join and form a chromosome. b. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, each sister chromatid is an individual chromosome. c. Before anaphase II, each sister chromatid is an individual chromosome; after anaphase II, the sister chromatids form a single chromosome. d. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, the sister chromatids become homologous chromosomes. e. There is no difference; they are still together as a single chromosome. 3. Crossing over during meiosis results in . a. two changed and two unchanged chromatids b. four unchanged chromatids c. four changed chromatids d. a random number of changed vs. unchanged chromatids e. one unchanged and three changed chromatids 4. Crossing-over during meiosis . a. holds homologous pairs of chromosomes together b. produces chromosomes consisting of two identical sister chromatids c. produces daughter nuclei with too much or too little genetic material d. creates chromosomes containing both paternal and maternal genes e. ensures that the developing zygote receives cytoplasm from one of the parents 5. In the Hershey and Chase experiment, the pellet was radioactive after bacteria had been infected with 32P-labeled viruses and centrifuged. Why? a. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive proteins into their DNA. b. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive DNA. c. Viruses were centrifuged to form the pellet, and they had incorporated radioactive proteins from the bacterial DNA. d. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive proteins into their cell membranes. e. Viruses were centrifuged to form the pellet, and they had incorporated radioactive DNA.