Compared with 31P, the radioactive isotope 32P has
A) a different atomic number.
B) one more proton.
C) one more electron.
D) one more neutron.
Ans: D) one more neutron.
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To what disease do individuals heterozygous
for cystic fibrosis have increased resistance?
a. hemophilia b. Tay-Sachs c. typhoid d. diptheria e. cholera
What drives the movement of carbon dioxide from tissue into the bloodstream?
A. active transport against a concentration gradient B. facilitated diffusion down a concentration gradient C. simple diffusion down a concentration gradient D. facilitated diffusion against a concentration gradient E. the heart pumping the carbon dioxide into the bloodstream
The walls of veins tend to be thicker and more elastic than those of comparably sized arteries.
Answer the following statement true (T) or false (F)
What hormones function in both the male and female reproductive system?
A) estrogen and progesterone B) gonadotropin-releasing hormones and progesterone C) luteinizing hormone and follicle-stimulating hormone D) luteinizing hormone and progesterone