How many chromosomes are there in a human genome?
A. 22
B. 23
C. 46
D. 64
B
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Recall the Bartel lab group experiment to create a ribozyme from scratch. If they had created exact copies of each ribozyme (rather than creating copies with a few differences), the ribozymes would have _____
A) become more efficient with each round of selection B) stayed the same with each round of selection C) become less efficient with each round of selection D) stopped catalyzing reactions after just a few rounds of selection
In skeletal muscle, an action potential leads directly to ________
a. the binding of actin with myosin b. the detachment of troponin from actin c. flexure of the already bound myosin heads d. the release of calcium from the sarcoplasmic reticulum
A vertebrate's circulatory system would include:a
open blood vessels. b. closed blood vessels. c. hemolymph. d. a hemocoel. e. hemocyanin
Which of the following statements about a gram- cell wall is FALSE?
A. It maintains the shape of the cell B. It has a thin layer of peptidoglycan C. It has an outer membrane of lipids D. It has teichoic acids