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.
B,C
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Which gene-altering event is most likely to create a new gene encoding a functional protein?
a. gene duplication followed by small mutations b. gene duplication followed by large mutations c. exon shuffling d. transposition of DNA sequences e. inversion of DNA sequences
While a eukaryotic pre-mRNA is still being synthesized it is modified on its 5' end when
a. exon shuffling mixes mRNA pieces. b. enzymes recognize a polyadenylation signal in the trailing RNA sequence. c. the RNA introns are cut out by the spliceosome. d. an enzyme adds a guanine-containing cap. e. the RNA exons are spliced together.
Immediately after a meal, the concentration of
glucose in the blood tends to increase due specifically to what digestive system task? a. mechanical processing b. secretion c. digestion d. absorption e. elimination
Which graph shows that species diversity is
much less at the equator than at 60 degrees north latitude? a. A b. B c. both d. neither e. not enough data is provided to answer the question