What is the purpose of the waxy cuticle in plants?
a. It prevents desiccation.
b. It prevents transpiration.
c. It prevents diffusion of gases.
d. It prevents the transport of nutrients.
e. It prevents the internal transport of water.
a
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Which of the following animals has an
exoskeleton?
a. leeches b. frogs c. crabs d. roundworms e. more than one of these animals has an exoskeleton
Allergy is a ____ response to ____ antigens
a. hypersensitive; environmental b. hyposensitive; cellular c. normal level; microbial d. mixed; protein e. mixed; microbial
Looking at the figure above, the darker screen behind the plants in genotype 1:
a. shows that these plants grow tall at high and low elevations but are short at medium elevations. b. shows that the plants respond very differently to elevation. c. shows that this genotype grows tallest at medium elevations and shorter at high and low eleva-tions. d. A and C.
The intermediates of the citric acid cycle are constantly being depleted because they are used to produce many of the amino acids needed to make proteins
The enzyme pyruvate carboxylase converts pyruvate to oxaloacetate to replenish these intermediates. Bacteria, but not animal cells, have additional enzymes that can carry out the reaction acetyl CoA + isocitrate -> oxaloacetate + succinate. Which of the following compounds will not support the growth of animal cells when used as the major source of carbon in food, but will support the growth of nonphotosynthetic bacteria? (a) pyruvate (b) glucose (c) fatty acids (d) fructose