DNA was first described by _____ in 1869
a. Johannes Miescher
b. Frederick Griffith
c. Oswald Avery and Macly McCarty
d. Alfred Hershey and Martha Chase
e. Maurice Wilkins
ANSWER: a
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How many different codons in our genetic code specify amino acids?
a. 3 b. 20 c. 60 d. 61 e. 64
Animals that are warm blooded, have body hair, and produce milk for their young are grouped in the class
a. amphibia b. mammalia c. aves d. reptilia
Thomas Malthus proposed that ____.
A. the food supply increases faster than the population B. The food supply limits population increase C. the food supply and population increase at the same rate D. artificial selection is the key to evolution E. natural selection is the key to evolution
The microscope preferred for viewing living specimens is the ________ microscope
A) bright-field B) phase-contrast C) scanning electron D) scanning tunneling E) transmission electron