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

Biology & Microbiology

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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

Biology & Microbiology

Which stage of development involves initial cellular

reorganization? a. gamete formation b. fertilization c. gastrulation d. organ formation e. tissue specialization

Biology & Microbiology

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.

Biology & Microbiology

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).

Biology & Microbiology