The region of each antibody molecule where amino acid composition is very different from one clone of B lymphocytes to another is the
A. variable region.
B. constant region.
C. hinge region.
D. light region.
E. joining region.
Answer: A
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Grizzly bears have large geographic ranges that consist of mosaics of forests and grasslands at varying altitudes. Grizzlies also require relatively pristine water sources in their range. Based on this, what species type best describes grizzly bears?
A. indicator species. B. keystone species. C. endemic species. D. flagship species. E. umbrella species.
Which variable is least likely to contribute to the species that appear in a community during succession?
a. Number of available nesting sites b. Climate c. Altitude d. Average temperature e. Soil type
Which of the following statements about transport through phloem is true?
A. Mostly dissolved starch is transported. B. It is aided by root pressure. C. Transport only occurs from the roots to the shoot. D. The direction of flow can change at different times if the sources and sinks change. E. No energy is required.
Which step of binary fission is the reason for genetically identical daughter cells?
a. There are four new daughter cells that result from one parental cell b. Elongation of the cell c. Splitting of the two daughter cells d. Replication of the bacterial chromosome