Mendel crossed true-breeding plants that had yellow peas with plants that had green peas. The resulting plants all had yellow peas. An F1 cross resulted in three-quarters of the plants having yellow peas and one-quarter of the plants having green peas. What does this tell you about the alleles for colour?
a. Green was the dominant colour.
b. Yellow was the recessive colour.
c. Yellow was the dominant colour.
d. Yellow was usually th
Answer: c. Yellow was the dominant colour.
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In the condition called athlete's foot, the fungus Trichophyton consumes the keratin protein found in hair, nails, and dead skin. Which of the following descriptors does not apply to Trichophyton?
A. Saprobe B. Parasite C. Eukaryote D. Heterotroph
Which statement best describes the gametes of most animals?
a. A sperm is large and motile; an egg is small and nonmotile. b. A sperm is small and nonmotile; an egg is large and motile. c. A sperm is large and nonmotile; an egg is small and motile. d. A sperm is small and motile; an egg is large and nonmotile. e. The sperm and egg are about the same size, but only the sperm is motile.
Consider that you have access to use fluorescent tagging of specific proteins and view cells in a confocal microscope. You isolate a cell with the fluorescent dyes, showing that a very tiny, single-celled organism has not only a cell membrane, but internally folded membranes. You determine also that the membranes do not completely surround internal specialized compartments of the cell. You identify this as
A. a prokaryote. B. a yeast. C. a eukaryote. D. a plant. E. an animal.
Body cells that respond to insulin include
A) Liver cells, as well as most other cells of the body. B) Liver cells and muscle cells only. C) Intestinal cells only. D) Muscle cells only. E) Liver cells only.