Which of the following does NOT occur during the latent period of muscle contraction?
a. Myosin heads bind to actin filaments.
b. Myofibrils shorten.
c. Muscle cell membrane initiates an electrical impulse which travels into the muscle cell.
d. Calcium is released from the sarcoplasmic reticulum.
e. all of these
Ans: b. Myofibrils shorten.
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Your roommate is experiencing heartburn and asks you to purchase her an antacid. Chemically speaking, how do you know that the antacid will help eliminate her pain?
A) It is a buffer and will prevent the pH in her digestive tract from changing. B) It has a higher OH- concentration to increase the pH in her digestive tract. C) It is probably high in H+. D) It has a low pH to balance the acidity in her digestive tract.
All calico cats are female because:a
two recessive X-linked genes are required for the calico phenotype. b. Y-linked genes prevent the expression of the calico phenotype. c. the calico phenotype is caused by random X chromosome inactivation. d. the calico phenotype is a Y-linked trait. e. one X chromosome and one Y chromosome are needed for the expression of the calico phenotype.
________ are a major source of restriction enzymes
A) Plant cells B) Human cells C) Bacteria
Oxygen is always required for the regeneration of NAD from NADH.
Answer the following statement true (T) or false (F)