Macrophages secrete ________ which then activates ________ .
A. Interleukin-1 ; Cytotoxic T cells
B. Interleukin-2 ; Helper T cells
C. Interleukin-2 ; Cytotoxic T cells
D. Interleukin-1 ; Helper T cells
Answer: D. Interleukin-1 ; Helper T cells
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What body cavity does the heart reside within?
a. cranial b. spinal c. thoracic d. abdominal e. pelvic
When step "d" is completed, the two DNA molecules produced will be
a. identical to each other but not to the parent DNA. b. identical to the parent DNA but not to each other. c. different from each other and the parent DNA. d. identical to each other and to the parent DNA. e. identical to each other and almost the same as the parent DNA.
How does the early development of the mouse differ from that of Caenorhabditis?
a. Embryonic mouse cells commit to their ultimate fate earlier than do the cells of Caenorhabditis. b. Early development of a mouse is regulative, while early development of Caenorhabditis is not. c. Mouse cells require higher concentrations of nutrients than do the cells of Caenorhabditis. d. Embryonic mouse cells differentiate much later than the cells of Caenorhabditis. e. Embryonic development in the mouse is controlled by transcription factors, while Caenorhabditis is not.
Which of the following binds to codons?
A) DNA B) Transfer RNA C) Messenger RNA D) RNA polymerase