In the vertebrate eye, what structure is light focused onto?
A. Retina
B. Pupil
C. Sclera
D. Lens
E. Iris
Answer: A
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Which of the following questions might be answered by using the method described?
A) How many cells are produced by the culture per hour? B) What is the length of the S phase of the cell cycle? C) When is the S chromosome synthesized? D) How many picograms of DNA are made per cell cycle? E) When do spindle fibers attach to chromosomes?
Which functional group is polar and a key component of alcohols?
a. carbonyl b. hydroxyl c. phosphate d. amino e. carboxyl
The wood duck shown in the above photograph was adversely affected by ____ and is making a comeback thanks to
____. a. global cooling; heat producing chemical added to their diet b. sexually transmitted viruses; a new vaccine c. limited numbers of natural cavities; artificial nesting boxes d. high incidence of males being born; transplantation of females from other areas e. invasive species; removal of introduced predators
Which muscles may contract during a more forceful expiration?
a. external intercostals. b. diaphragm. c. abdominal. d. both b and c.