The corpus luteum secretes some ____ and a lot of ____ which readies the uterus for pregnancy.
A. luteinizing hormone; follicle-stimulating hormone
B. Follicle-stimulating hormone; luteinizing hormone
C. GnRH; progesterone
D. estrogen; progesterone
E. progesterone; estrogen
Answer: D
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While shopping at your local drugstore, you stop at the blood pressure machine. It measures your blood pressure as 115/75 (good—that's healthy!). This number means that
A. arterial pressure is 115 mm Hg when the ventricles contract and 75 mm Hg in between ventricular contractions. B. arterial pressure is 75 mm Hg when the ventricles contract and 115 mm Hg in between ventricular contractions. C. arterial pressure is 115 mm Hg when the atria contract and 75 mm Hg in between atrial contractions. D. your sinoatrial node generates a 115 mV signal and your atrioventricular node generates a 75 mV signal. E. your sinoatrial node generates a 75 mV signal and your atrioventricular node amplifies this to a 75 mV signal.
If a hybrid is unable to produce sperm because meiosis does not proceed correctly, gene flow between the species is restricted by
A) hybrid infertility. B) gametic isolation. C) temporal isolation. D) hybrid viability. E) ecological isolation.
The three natural processes that underlie evolution are genetic variation, inheritance, and ________
Fill in the blank(s) with correct word
Which of the following environmental conditions may have an influence on enzyme activity?
a. substrate concentration b. temperature c. pH d. all of these are correct