What cells are also called CD4 cells?
A) B cells
B) suppressor T cells
C) cytotoxic T cells
D) plasma cells
E) helper T cells
Ans: E) helper T cells
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What is the age of the twig in the accompanying figure?
a. 0 years
b. 1 year
c. 2 years
d. 3 years
e. 5 years
Food leaving the pharynx moves next into the stomach. Indicate whether the statement is true or false
Which of the following best describes the opening and closing of the stomata in most plants?
A) They are open during the day and closed at night. B) They are open at night and closed during the day. C) They are open almost all of the time. D) They are closed except for brief periods of time during the day.
To avoid confusion and facilitate ease of data interpretation, researchers working on cloned DNA from the same species use
A. consensus sequencing. B. clone by clone sequencing. C. shotgun sequencing. D. restriction fragment length polymorphisms. E. sequenced-tagged sites.