You step on something in the yard resulting in a puncture wound that does not bleed freely. Antigens from any microbes that entered the wound will most likely end up in the
A. appendix.
B. lymph nodes of the groin.
C. lymph nodes of the neck (cervical).
D. lymph nodes of the armpit (axilla).
E. spleen.
Answer: B
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The "Southern Beech" tree is found in such diverse places as Australia, South Africa, and South America. People did not transplant it. How did it probably get to these widely separated locations?
A) The simultaneous creation of the same species occurred in different geographic locations. B) Seeds were carried by birds. C) Seeds were blown by the prevailing winds. D) Glaciers split what was once a continuous, huge population of beeches. E) These landmasses were once connected and later drifted apart.
If a gene has three alleles in a population, their frequencies must add up to ________
A) 1.0 B) 0 C) 3.0 D) 1.5
Natural selection is regarded as a theory because:
A) other equally acceptable scientific mechanisms for evolution exist. B) it is a general principle, supported by a wide variety of evidence. C) it has not been tested. D) it has been tested and found to be untrue.
Which of the following occurs during recombination?
a. Homologous chromosomes exchange linear segments of genetic material. b. One gene interferes with the expression of another gene. c. Identical alleles are expressed simultaneously in a heterozygote. d. The gene order of homologous chromosomes is significantly altered.