________ is caused by an interference with the blood supply to the brain.
A. Angina pectoris
B. A stroke
C. Arteriosclerosis
D. Atherosclerosis
Answer: B
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Since Watson and Crick described DNA in 1953, which of the following might best explain why the function of small RNAs (miRNAs) is still not well understood?
A) As RNAs have evolved since that time, they have taken on new functions. B) Watson and Crick described DNA but did not predict any function for RNA. C) The functions of small RNAs could not be approached until the entire human genome was sequenced. D) Ethical considerations prevented scientists from exploring this material until recently. E) Recent advances in technology and our understanding of how DNA is expressed have made this possible.
Compound eyes are composed of independent visual units called
A. apposition segments. B. ocelli. C. ommatidia. D. retinas. E. simple eyes.
Enzymes
a. are very specific. b. act as catalysts. c. are organic molecules. d. have special shapes that control their activities. e. are all of these.
A large organic molecule that contains repeating subunits is called a _____.
A) monomer B) polymer C) steroid D) simple sugar