Which of the following is TRUE of peptide hormones?
A. They are generally water-soluble.
B. They bind membrane receptors to elicit a response on target cells.
C. They bind intracellular receptors to elicit a response on target cells.
D. They are water-soluble and bind membrane receptors to elicit a response on target cells.
E. They are lipid soluble.
D. They are water-soluble and bind membrane receptors to elicit a response on target cells
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A scientist studying a material has determined that 12C, 13C, and 14C occur in the material in a ratio of 1000:10:1. How did he most likely differentiate between these forms of carbon?
A. by the number of protons in 12C, 13C, and 14C B. by the number of electrons in 12C, 13C, and 14C C. by the number of neutrons in 12C, 13C, and 14C D. by the biomasses of 12C, 13C, and 14C E. by the number of positrons in 12C, 13C, and 14C
A Venus fly trap’s niche in an ecosystem is as
a ________.
a. producer b. primary consumer c. second-level consumer d. producer and primary consumer e. producer and second-level consumer
Which of the antibody classes is able to destroy an antigen by activating the nonspecific killing action of the natural killer cells?
A) IgM only B) IgE only C) IgG only D) both IgG and IgM E) both IgM and IgE
Flowering plants are pollinated by insects and other animals. What is the advantage of this method of reproduction?
a. Diversity is much more likely within this group. b. It allows these flowering plants to thrive in drier climates. c. It eliminates the need for swimming sperm. d. The success of these plants provides more food for predators. e. Flower pollination by insects and animals is much more efficient than pollination that relies on the wind.