Cell differentiation occurs due to ____
a. unequal cytoplasmic divisions
b. the removal of different genes in different cell types
c. polarization of the cell
d. the presence of the X and/or Y chromosome in the cell
e. changes in gene expression in different cell types
ANSWER: e
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Complex organisms can be characterized as having:
A. a small genome with few genes. B. a small genome with many genes. C. a large genome with few genes. D. a large genome with many genes. E. None of the answer options; there is no correlation between the complexity of an organism and these characteristics.
Your mother has albinism, which is a recessive trait. Your father has cystic fibrosis, which is also a recessive trait
You discover that your new father-in-law has albinism and cystic fibrosis. If neither you nor your spouse has either albinism or cystic fibrosis, what are the odds that your first child will have neither albinism nor cystic fibrosis?
a. 1/16 b. 3/8 c. 1/8 d. 9/16 e. 0
cIn the spiral staircase model of DNA, the handrails
are a. covalent bonds. b. hydrogen bonds. c. nucleotide base pairs. d. phosphate and deoxyribose groups. e. composed of all of these.
Solar aquatic systems constructed by biologist John
Todd work with all of the following EXCEPT a. decomposers that degrade waste. b. plants that grow on nutrients released. c. heat from sunlight that speeds degradation. d. an artificial marsh used to filter algae. e. aquatic fish and birds used to finish the process.