In people who do not have Tay—Sachs disease, the hexA gene encodes an enzyme that
A) converts purines to uric acid in the kidneys.
B) removes a sugar group from phenylalanine.
C) converts tyrosine to melanin in skin.
D) cleaves acetylgalactosamine from gangliosides.
E) synthesizes glycogen from glucose monomers.
D
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You are a doctor examining a patient's blood test results. The patient's T cell count is low, and T cells that are present are not well developed. You examine scans of the patient's thymus. It is underdeveloped, which means the T cells in the blood ______
(Select all correct answer options.) A. will be present in lower numbers because the thymus is where T cells are formed. B. will be present in lower numbers because the thymus is where T cells mature. C. will have not undergone selection against self-recognition, and the patient will be more susceptible to autoimmune diseases.
On what basis have Microsporidia been classified as fungi?
A. Lack of mitochondria B. Analysis of ribosomal RNA C. Presence of a polar tube D. Presence of mitosomes E. Role as an obligate intracellular parasite
What traits do green algae and plants have in common?
_____ plastids. _____ chlorophyll a and b. _____ a sporic life cycle. _____ beta-carotene. _____ embryos.
Parasitic helminths have the following characteristics, except
A. they have a definitive host where the adult form lives. B. they include tapeworms. C. they are multicellular animals. D. they have developmental forms that include cysts. E. they include roundworms.