If pregnancy does not occur, ____
a. LH levels rapidly rise
b. the corpus luteum degenerates
c. estrogen and progesterone levels rise
d. the endometrium thickens
e. the luteal phase begins
ANSWER: b
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a. High concentrations of ATP inhibit the formation of more ATP. b. The ATP concentration in cells actually decreases at first when cells need large supplies of energy. c. The activity of many different enzymes influences the supply of ATP in cells. d. Cells constantly adjust their metabolic reactions to provide energy whenever it is needed. e. All of these are true.
Although mutations have been observed in many different genes, they have not been isolated in histones. Why does this seem reasonable? If one wanted to produce antibodies to histones, would it be an easy task? Explain your answer
What will be an ideal response?
Use the word bank to identify the labeled structures on this diagram of the heart:apex, pulmonary trunk, aorta, right atrium, inferior vena cava, left pulmonary veins, right ventricle, left atrium, left subclavian artery, right pulmonary veins, left ventricle, right coronary artery, left common carotid artery, left cardiac vein, brachiocephalic artery, right pulmonary artery, superior vena cana, left pulmonary artery.
a.________j.________b.________k.________c. ________l.________d.________m.________e.________n________f.________o.________g.________p.________h.________q.________i.________r.________
What will be an ideal response?
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Indicate whether the statement is true or false