Seagrasses can reach high productivity levels with the aid of:
a. oxygen brought to their roots via mud shrimp burrows.
b. symbiotic, nitrogen-fixing bacteria.
c. their leaves, cleared of epiphytes by grazers.
d. fertilization by manatees.
e. eutrophic water conditions.
B
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In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over
spotted (s). If Bb Ss were crossed with Bb ss, the chance that a black, solid individual would be produced is a. 3/16. b. 1/3. c. 9/16. d. 3/8. e. 1/16.
Which are the functional units of the kidney?
a) ureters b) glomeruli c) nephrons d) renal capsules
A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest
A. chorionic villi sampling. B. amniocentesis. C. a pedigree analysis. D. genetic counseling.
What of the following is necessary for the replication process to occur in a cell?
A. enzymatic proteins B. viruses C. carbohydrates D. starches E. lipids