Oral sex can transmit the HIV/AIDS virus just as readily as vaginal sex.
a. true
b. false
Answer: a. true
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What is considered to be the first evidence of differentiation in the cells of an embryo?
a) the occurrence of mRNAs for the production of tissue-specific proteins b) cell division occurring after fertilization c) changes resulting from induction d) determination of specific cells for certain functions e) changes in the size and shape of the cell
Carbon dioxide is split to form oxygen gas and carbon compounds _____
A) during photosynthesis B) during respiration C) during photosynthesis and respiration D) in neither photosynthesis nor respiration
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
Identical copies of genes that can be transcribed simultaneously are called
A. multigene families. B. pseudogenes. C. tandem clusters. D. expressed sequences. E. segmental duplications.