In tobacco plants, a H+/sugar cotransporter called NtSUT1 is required for sucrose loading into phloem. Levels of NtSUT1 are likely to be highest in what plant tissue?

A. roots
B. leaves
C. flowers
D. seeds


Answer: B

Biology & Microbiology

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Host cells of viruses include ________.

A. protozoa and algae B. humans and other animals C. plants and fungi D. bacteria E. All of the choices are correct.

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Olfactory bulbs are located in which portion of the brain?

a. occipital lobe b. frontal lobe c. parietal lobe d. occipital lobe e. thalamus

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If a Drosophila female has a homozygous mutation for a maternal effect gene, _____

A) she will not develop past the early embryonic stage B) all of her offspring will show the mutant phenotype, regardless of their genotype C) only her male offspring will show the mutant phenotype D) only her female offspring will show the mutant phenotype

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