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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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.
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.