What is the role of the villi in the small intestine?
A) To absorb small nutrient molecules from the digestive tract
B) To move food along the digestive tract
C) To secrete digestive enzymes into the digestive tract
D) To secrete water into the digestive tract
Ans: A) To absorb small nutrient molecules from the digestive tract
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How could overlapping genes in a positive ssDNA virus genome be predicted?
A) Convert the positive ssDNA into its complementary ssDNA and search for genes in the negative ssDNA strand for sequences used in more than one predicted gene. B) Directly search the three frames of the positive ssDNA for genes that have sequences where more than one gene is predicted. C) Convert the positive ssDNA into negative ssDNA and search all six possible frames for genes that use part of the same sequence. D) Convert the positive ssDNA into its complementary ssDNA and search for genes in the negative ssDNA strand that also share a complementary gene in the positive strand.
Stabilizing selection reduces genetic and phenotypic variation and increases the frequency of intermediate phenotypes
a. True b. False
Water balance is maintained by the structures labeled
a. 1 and 3. b. 5 and 9. c. 7 and 8. d. 6 and 9. e. 1 and 6.
When chromosomes fail to separate at either the first or second meiotic division, this
a)is known as crossing over. b)results in a sperm or egg cell with an abnormal number of chromosomes. c)is known as translocation. d)results in a failure to produce gametes. e)results in arrest during meiosis.