You notice that some squirrels in your neighborhood have a much darker coat color than most of the other squirrels. Is this darker color an adaptation?
A) Yes, all variations are adaptations.
B) No, adaptations are traits developed when they're needed to help an organism survive.
C) You can't know unless you can know the coat color of the dark squirrel's parents.
D) The trait is only an adaptation if it gives the squirrels an advantage in their habitat.
D
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Insertions and deletions of three base pairs:
A. change one codon and, therefore, only one amino acid in the protein sequence. B. do not disrupt the reading frame so the protein ends up completely normal. C. do not disrupt the reading frame so the protein will usually retain some degree of function. D. cause frameshifts that will change the reading frame and, therefore, the sequence of the protein. E. usually result in the expression of a truncated protein.
Compounds that kill the cell are said to be:
A. cytotoxic. B. genotoxic. C. mutagenic. D. carcinogenic. E. auxotrophic.
Which type of neuron directly stimulates a muscle or gland?
a. afferent neurons only b. efferent neurons only c. interneurons d. afferent and efferent neurons e. afferent neurons and interneurons
Lamarck’s contribution to the theory of evolution is the concept of
a. natural selection. b. catastrophism. c. inheritance of acquired characteristics. d. mutation. e. geographic distribution of organisms.