The biological species concept cannot be applied to fossils. Which alternate approach to identifying species would be most useful for classifying fossil organisms?
A) an approach based on use of reproductive barriers
B) an approach based on genetic history
C) an approach based on measurable physical traits
D) an approach based on molecular biology
C
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Why are viruses not considered to be living organisms?
What will be an ideal response?
An atom or molecule with an electrical charge is a(n)
A. isomer. B. isotope. C. ion. D. neurotransmitter. E. acid.
Which of the following statements about taste is false?
a. Taste receptors activate second messengers in the signal transduction process. b. Genetics play a role in determining what a person tastes. c. Taste receptors only detect chemicals that have been dissolved in saliva. d. Smell affects flavor because odors pass from the mouth to the nasal cavity. e. If taste receptors are damaged, they are incapable of regeneration
Refer to the accompanying figure. At what point of this life cycle does fertilization occur?
a. 1
b. 4
c. 6
d. 7
e. 8