Four of the five answers listed below are

principal characteristics of all chordates. Select
the EXCEPTION.



a. tail
b. bony vertebra
c. notochord
d. nerve cord
e. pharyngeal gill slits


B

Biology & Microbiology

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Small circular pieces of bacterial DNA that are used as vectors in cloning experiments are called _____

A. phages B. viruses C. plasmids D. chromosomes

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For a particular gene, the frequency of the dominant allele H is 0.65. The total population size is

10,000 individuals. Also, the homozygous recessive condition results in living but sterile offspring. Fill in the table of values for the generations indicated:Generation p q p2 2pq q2 1 2 Does this population exhibit Hardy-Weinberg equilibrium? Why or why not? If not, what assumptions does the Hardy-Weinberg principle make that appear to be inapplicable in this situation? What will be an ideal response?

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All of the following are means of genetic recombination in prokaryotes EXCEPT

A. transformation. B. transduction. C. crossing over. D. conjugation.

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Recent discoveries of microscopic fossils have extended the known history of life to about

A. 1 billion years ago. B. 2 billion years ago. C. 3.5 billion years ago. D. 4.5 billion years ago.

Biology & Microbiology