Habitat fragmentation poses severe threats to many species because of:
A) small size of local populations.
B) undesirable edge effects.
C) barriers to movement in response to changing conditions.
D) all of the above.
Ans: D) all of the above.
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A. Watson and Crick. B. Griffith. C. Garrod. D. Franklin. E. Beadle and Tatum.
The chromosomal theory of inheritance was first proposed by ___________
A. Mendel B. Boveri and Sutton C. Darwin and Mendel D. Weismann and Boveri
Which of the following describes an organ?
a. groups of similar cells that perform specialized functions b. composed of at least two types of tissues c. structure that contains DNA d. a thin bilayer that separates individual cells
What is the light used for in Chlamydomonas?
a. as a source of information about the external environment b. as a source of information about the internal environment c. as a source of energy and as a source of information about the external environment d. as a source of energy