Which type of white blood cell is the most common/abundant in normal blood?
a. eosinophil?<2-4%
b. monocyte?3-8%
c. neutrophil?60-70%
d. lymphocyte?20-25%
Answer: c. neutrophil?60-70%
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Single-stranded ends generated by the same restriction enzyme are complementary to each other. They can be joined together,
A. even when the source of the DNA is different. B. only when the source of the DNA is the same. C. but the "sticky ends" will most likely have to be modified. D. but the hybridization of the two ends may cause a problem with cloning. E. only if the subunits have been methylated.
Which of the following is TRUE of a genetic mutation?
A. It always produces harmful effects. B. It never affects protein structure or function. C. It is not a mechanism through which biological evolution occurs. D. It happens quite frequently in a population. E. It generally produces a change in the DNA sequence of a gene.
When light hits a pigment, how many electrons are excited by a single photon?
a. one b. two c. three d. four
Which plant tissue contains cells called tracheids?
A) phloem B) meristematic tissue C) ground substance D) xylem