The immune system is capable of mounting specific responses to particular microorganisms because ________
A) lymphocytes are able to change their antigen specificity as required to fight infection
B) the body is able to determine which type of B and T cells to make
C) the body contains an enormous diversity of B and T cells, each with a specific kind of antigen receptor
D) the body is able to make different antigen receptors depending on the invading microorganism
C
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In the chemical shorthand, 14C, the 14 represents the number of ____
a. excess neutrons b. protons plus neutrons c. electrons d. protons plus electrons e. radioactive particles
Which stage of development involves initial cellular
reorganization? a. gamete formation b. fertilization c. gastrulation d. organ formation e. tissue specialization
Nitrogen is a critical requirement for living organisms because it is a component of:
a. carbohydrates and lipids. b. carbohydrates. c. lipids and nucleic acids. d. nucleic acids and proteins. e. nucleic acids and carbohydrates.
Factors of weather and climate that operate on a population regardless of its size are called ________ effects.
Fill in the blank(s) with the appropriate word(s).