In proteins, structural segments called ____ provide flexibility that allow parts of the protein to bend, fold, or move
a. random coils
b. peptide bonds
c. b sheets
d. a helices
e. b polysaccharides
ANSWER: a
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What is a reasonable conclusion based on the chi-square analysis?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) There is a high probability that the deviation from the expected results is due chance.
B) One can say with a high degree of confidence that genes C and D are linked.
C) The analysis supports the null hypothesis.
D) Genes C and D are most likely unlinked.
HIV is transmitted in ____
a. food b. water c. body fluids d. air e. infected surfaces
In an experimental situation, a student researcher inserts an mRNA molecule into a eukaryotic cell after he has removed its 5' cap and poly-A tail. Which of the following would you expect him to find?
A. The molecule is digested by restriction enzymes in the nucleus. B. The molecule is digested by exonucleases since it is no longer protected at the 5' end. C. The molecule attaches to a ribosome and is translated, but more slowly. D. The cell recognizes the absence of the tail and polyadenylates the mRNA. E. The mRNA could not exit the nucleus to be transcribed.
Inflammation begins when _______________ release the contents of their granules into an affected tissue.
A. eosinophils and neutrophils B. dendritic cells and basophils C. macrophages and neutrophils D. basophils, neutrophils, and mast cells E. B cells, leukocytes, and basophils