In plants, the vascular tissue that consists of living cells that distribute sugars throughout the plant is called
A) xylem.
B) phloem.
C) lignin.
D) pollen.
Answer: B
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Which of these factors would have the least effect on heat transfer processes in animals?
A. surface area of the body B. difference between body temperature and ambient temperature C. internal insulation such as blubber D. external insulation such as feathers or fur E. bone density
Which of the following statements concerning decarboxylation reactions is FALSE?
a. They occur as part of the citric acid cycle. b. They produce CO2 that is then exhaled via breathing. c. They involve the removal of a carboxyl group (?COOH) from a substrate. d. They are one type of general reaction that occurs during aerobic respiration. e. They involve the removal of two protons and two electrons.
Ribose differs from deoxyribose by having:a
two attached bases. b. one less oxygen. c. an extra hydroxyl group. d. an extra carbon in the ring. e. one less carbon in the ring.
When is cell-to-cell communication particularly important in regulating gene expression?
A) During mitosis B) During meiosis C) During embryonic development D) During replication