If you rub the scaled skin of a shark, it feels rough when you move your hand from tail to head but smooth when you move from head to tail. What is a major advantage of the scales being oriented this way?
A. To better prevent water loss from the body tissues
B. To enable the shark to orient itself in space and detect prey
C. To keep the shark afloat in the water
D. To better protect the shark from predators
E. To counteract friction as the shark swims through the water
Answer: E
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Which one of the following scientists tested the hypothesis that microorganisms can arise by spontaneous generation?
A. Elena and Lenski B. Redi C. Pasteur D. Darwin E. Alvarez
Mutation rates:
A. are higher in organisms with larger genomes. B. are similar across all organisms. C. are highest in viruses. D. are lower in organisms with larger genomes. E. are highest in the bacteria.
What is the basic problem with artificial
cloning of adult cells?
a. adult cells are already differentiated b. adult cells do not divide c. adult cells have too many mutations d. adult cells only have a subset of the original embryonic DNA e. more than one of these is a basic problem with the artificial cloning of adult cells
When an mRNA moves into the cell's cytoplasm, it first becomes associated with a:
A) transcription factor. B) protein. C) ribosome. D) tRNA.