Who of the following is credited with developing and documenting the first vaccination procedure against smallpox?
A. Koch
B. Pasteur
C. Jenner
D. Lister
Answer: C. Jenner
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The zygote has
A. one copy of each chromosome. B. one full haploid complement of chromosomes. C. chromosomes identical to those of a sperm cell. D. chromosomes identical to those of an egg cell. E. two copies of each chromosome.
The fossil record is incomplete because
a. very few organisms were preserved as fossils. b. organisms tend to decay before becoming a fossil. c. animals with hard parts are preserved more easily. d. geologic processes may destroy fossils. e. all of these are true.
Which of the following occurs during metaphase of mitosis?
a. Centrioles migrate to opposite poles of the cell. b. Chromatin condenses into chromosomes. c. The nuclear envelope disappears. d. Chromosomes decondense into chromatin.
Sexually transmitted chlamydia is similar to infection with Yersinia pestis in that they both can produce
A. urethritis. B. pelvic inflammatory disease in females. C. conjunctivitis. D. buboes. E. pneumonia.