All of the following are mechanisms of thermoregulation in ectothermic animals EXCEPT
A. countercurrent heat exchangers.
B. changing the rate of heat production by muscular activity.
C. changing the rate of heat loss by vasodilation and vasoconstriction.
D. relocating to cool areas when too hot or warm areas when too cold.
E. insulation in the form of feathers or fur.
E. insulation in the form of feathers or fur.
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Major classes of macromolecules present in all living microorganisms include
A) amino acids, carbohydrates, lipids, and nucleic acids. B) cell wall, cytoplasmic membrane, nucleoid, and ribosomes. C) genes, proteins, and vitamins. D) inorganic and organic compounds.
Mycorrhizae are
a. roots. b. bacteria. c. fungus roots. d. isolated plants. e. small animals found in agricultural soils
In primary mutant screens,
A) mutant flies are identified by morphology and then the mutant genes are isolated and studied. B) mutant flies are created by RNAi using random RNA sequences and then the genes affected identified. C) mutant flies are created by gain-of-function expression of random genes. D) two mutant flies are mated to determine if there is an effect on morphology.
Which of the following plant types complete their life cycle in 2 years?
A) annuals only B) annuals and perennials C) biennials only D) perennials only