Biological Sciences II, BIO 202 Sample Exam 2 Fall 2015

1. Embryonic determination
a) prevents cells from being pleuripotent
b) results in some cells transcribing different genes than other cells
c) occurs in steps, with early cleavage being a time with much determination
d) a and b, but not c e) a, b, and c

2. Which of the following is not a part of gastrulation?
a) repeated mitosis divisions b) formation of the archenteron
c) formation of three germ layers d) many cells becoming determined
e) folding in of the neurectoderm

3. Some alleles increase in a gene pool because they give organisms that possess them greater probabilities of surviving and reproducing. This describes
a) natural selection b) genetic drift c) allopatric speciation
d) uniformitarianism e) inheritance of acquired characteristics

4. During the early cleavage divisions of a vertebrate embryo, the blastomeres
a) are produced by meiosis b) contain different alleles from one another
c) contain different cytoplasmic chemicals
d) perform lots of transcription
e) repeatedly skip the S part of interphase

5. Which of the following is part of a DNA molecule?
a) uracil b) amino acids c) cytosine d) polymerase e) ribose

6. The term “zygote” refers to
a) a large haploid ovum prior to fertilization b) the diploid cell created by fertilization
c) the entire embryo prior to gastrulation d) a female gamete
e) the embryo produced after the first cleavage division

7. Suppose that we place a new gene in a blastomere that lies in the ectoderm of a frog embryo during late gastrulation. In which of the following tissues of the adult frog might the gene be found after the frog completes development? a) muscles b) notochord
c) vertebrae