"Sticky ends" are ________
A) single-stranded ends of fragments of double-stranded DNA
B) regions of double-stranded DNA that can be cut by a restriction enzyme
C) portions of DNA used as markers for STR analysis
D) regions of DNA amplified in PCR
A
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Which of the following describes a plant shoot growing upward?
a. positive gravitropism b. negative thigmotropism c. negative gravitropism d. positive feedback
The effect of red light on plants is to:
a. inactivate phytochrome. b. convert Pfr to Pr. c. inhibit germination in some seeds. d. initiate shade avoidance responses. e. impact the equilibrium between Pr and Pfr
Which statement best describes the function of NADH and FADH2?
a. Both produce ATP by substrate-level phosphorylation. b. Both transport acetyl-CoA to mitochondria. c. Both provide electrons to the electron transfer system. d. Both release energy for glycolysis to proceed.
The presence of the loop of Henle allows which animals to reabsorb water and produce a hypertonic urine?
A. Birds and mammals B. Birds C. Birds and reptiles D. Mammals E. Freshwater fish and mammals F. Marine fish