New roots can form anywhere along the root, not just at the tip
A. true
B. false
A
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Choanoflagellates are single-celled eukaryotes that feed on bacteria. The presence of their food bacteria causes these cells to cluster into multicellular structures in which the individual choanoflagellate cells are attached to one another
Based on this observation, it may be assumed that: A. the bacterial cells, or a chemical released by the bacteria, bind to a receptor on the plasma membrane of the choanoflagellate cells. B. the choanoflagellate cells use cadherins to attach to each other. C. the choanoflagellates use integrins to attach to each other. D. choanoflagellates are complex multicellular organisms because they alternate between single cell and multicellular states.
The somatic nervous system controls
A) the brain and spinal cord. B) some glands. C) skeletal muscles. D) cardiac muscle. E) smooth muscle.
In some flowers, a purple pigment is synthesized from a red precursor pigment. In the absence of all pigment, flowers are white. A pure-breeding plant with red flowers was crossed to a pure-breeding plant with white flowers. All of the F1 plants had white flowers. The F1 plants were crossed to each other, and the F2 consisted of 165 plants: 123 with white flowers, 32 with purple flowers, and 11 with red flowers. How do these results suggest that flower color is determined?
A) One gene with two alleles exists and heterozygotes have a different phenotype than either homozygote. B) The dominant allele of one gene masks the effect of a second gene. C) The recessive allele of one gene masks the effect of a second gene. D) A dominant allele of two genes is necessary for purple flowers. E) A dominant allele of either of two genes is sufficient for purple flowers.
The primary function of capillaries is to
A. allow exchange of materials between the blood and cells. B. carry blood through the body. C. manufacture blood cells. D. connect arteries to veins.