Which structure is not a component of a nucleotide?
a. Phosphate group
b. Sulfhydryl Oxygen group
c. Nitrogen-containing base
d. Pentose
Ans: b. Sulfhydryl Oxygen group
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What is the main prerequisite for clearance at the G2 checkpoint?
a. cell has reached a sufficient size b. an adequate stockpile of nucleotides c. accurate and complete DNA replication d. proper attachment of mitotic spindle fibers to
Pituitary dwarfism may be caused by reduced production of:
a. mineralocorticoid b. glucocorticoid c. calcitonin d. growth hormone e. the parathyroid hormone
Catalase
a. is an enzyme found in most cells, including liver. b. catalyzes the production of hydrogen peroxide. c. has as its substrate water and oxygen gas. d. is a substance that encourages the growth of microorganisms.
Why is the filamentous morphology of the water molds considered a case of convergent evolution with the hyphae of fungi?
a. Fungi are closely related to the water molds. b. Body shape reflects ancestor-descendant relationships among organisms. c. Filamentous shape is an adaptation for a nutritional mode as a decomposer. d. Hyphae and filaments are necessary for locomotion in both groups. e. Filamentous body shape is evolutionarily primitive for all eukaryotes.