Polysaccharides on bacterial cells stimulate the production of antibodies by binding to
A) B cells that stimulate plasma and memory cell proliferation.
B) helper T cells that directly stimulate plasma and memory cell proliferation.
C) helper T cells that release interleukin-1 to stimulate plasma cell proliferation.
D) B cells that release interleukin-2 to stimulate plasma cell proliferation.
E) B cells that stimulate plasma cell proliferation.
Ans: E) B cells that stimulate plasma cell proliferation.
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A signaling molecule that binds a membrane protein is called a ____
Fill in the blank with the appropriate word.
Ribosomal subunits
a. come together in threes to form functional units. b. are composed of mRNA and structural proteins. c. are synthesized in the cytoplasm. d. converge only when mRNA is to be translated. e. are transcribed from the complementary strand of DNA that is used for tRNA transcription.
A daily intake of 1,200 milligrams of this mineral should prevent osteoporosis.
A. phosphorus B. iron C. calcium D. vitamin A
When a lion competes with a zebra for water, it is an example of interspecific competition.
Answer the following statement true (T) or false (F)