Pygmies likely evolved because individuals who reproduced early in life were more fit than individuals who reproduced later in life.
a. true
b. false
Ans: a. true
(Small size at maturity results when individuals grow slower or reproduce earlier; since pygmies don’t grow much slower than normal, their size must reflect selection for earlier reproduction.)
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Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against Mr. Johnson's jaw. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. Where was the hearing problem most likely to
be? A. auditory cortex of Mr. Johnson's brain B. auditory nerve leading to Mr. Johnson's brain C. hair cells in the cochlea D. tympanum or the bones of the middle ear E. fluid of the cochlea
The figure above depicts the result of an experiment to determine how DNA replication occurs. Based on these results, it
appears that after replication, each new DNA molecule contains ____.
a. either entirely old DNA strands or entirely new DNA strands b. one old DNA strand and one new DNA strand c. entirely new DNA d. some DNA helix regions from old DNA alternating with some DNA regions from new DNA e. two strands that are each a mix of old and new DNA
Red tides and extensive fish kills are caused by
population blooms of a. Euglena. b. specific dinoflagellates. c. diatoms. d. Plasmodium. e. fish.
Which antimicrobial does not interfere with protein synthesis?
A. Tetracyclines B. Trimethroprim C. Erythromycin D. Chloramphenicol E. Aminoglycosides