Which blood vessels carry oxygenated blood?
A. pulmonary veins
B. systemic veins (such as the femoral vein in your leg)
C. pulmonary arteries
A. pulmonary veins
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Phycobilins are
(a) photosynthetic pigments. (b) found in the red algae. (c) blue and red pigments. (d) all of the above.
What is the difference between the trithorax (TrxG) and polycomb (PcG) complexes of proteins?
A. TrxG proteins methylate lysine 27 on histone H3 while PcG complexes methylate lysine 4 on H3 B. Methylation of lysine at position 4 on H3 results in silencing of gene expression C. TrxG complex proteins activate gene expression by methylating lysine 4 on H3, while PcG complex proteins repress gene expression by methylating lysine 27 on H3. D. Methylation of H3 on lysine 27 can result in activation of transcription
All of the following are explanations for the evolution of a large brain except
What will be an ideal response?
In light of increasing antibiotic resistance, alternative antimicrobial therapies are being explored. These include the CRISPR system, which ____
A. When delivered with an antibiotic, can splice out the genes causing resistance to the drug, which is then able to kill the bacteria B. Directly kill the bacteria instead of requiring an antibiotic C. Is comprised of immune peptides that are not susceptible to bacterial resistance D. Extracts drugs from bacteria that are not cultivable in a laboratory environment