The ________ system of blood proteins act to lyse foreign cells and viruses.
A. cell-mediated
B. humoral immunity
C. lymphoid
D. complement
Answer: D
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Which of the following hypotheses is the most current and accepted one with regard to modern human origins?
A. the multiregional hypothesis B. the out-of-Africa hypothesis C. the convergent hypothesis D. the single regional hypothesis
The brains of female zebra finches lack the hormonal influences that occur in the brains of males. As a result, what
changes are seen in the female brains?
a. auditory processing centers are especially well-developed in females b. more neurons are produced in the higher vocal center c. increased transcription of genes whose products are involved in memory retention d. the number of neurons in the higher vocal center declines e. octopamine levels increase, stimulating neural transmissions
All free viral particles contain _____
a. a viral genome and a plasma membrane b. both DNA and RNA protected by a viral envelope c. RNA enclosed within a helical rod d. a viral genome protected by a protein coat e. a viral genome protected by a viral envelope
In the polymerase chain reaction, what is the purpose of the initial high temperature? What is the purpose of cooling in the second step?
What will be an ideal response?