Enzymes are
A. broken down in reactions that require energy input.
B. not needed for catabolic reactions.
C. proteins that function as catalysts.
D. used up in chemical reactions.
E. All of these choices are correct.
Answer: C
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What is the difference between pollination and fertilization in flowering plants?
A) Fertilization precedes pollination. B) Pollen is formed within megasporangia so that male and female gametes are near each other. C) Pollination is the transfer of pollen from an anther to a stigma. Fertilization is the fusion of haploid nuclei. D) If fertilization occurs, pollination is unnecessary.
Imagine in lemmings, that gray fur color (G) is dominant over white (g). There is another gene, called color, and individuals must have at least one “C” allele for gray color to be expressed. You obtain a white lemming that is heterozygous for gray fur color. What is its genotype?
A. ggcc B. GgCC C. Ggcc D. ggCc E. gc
When might cytosol leak into plant cell vacuoles?
A) if water freezes outside a plant cell B) if water freezes inside a plant cell C) if severe drought conditions shut down normal rates of transpiration D) if the critical night length isn't met
In biological membranes, the phospholipids are arranged in a
A) single layer, with the fatty acids facing the interior of the cell. B) bilayer, with the phosphorus groups in the interior of the membrane. C) bilayer, with the fatty acids pointing toward one another. D) single layer, with the phosphorus-containing region facing the interior of the cell. E) bilayer, with the fatty acids facing outward (facing the interior and exterior of the cell).