The laboratory technique used to separate the DNA fragments produced by automated DNA sequencing is:
A. the polymerase chain reaction
B. gel electrophoresis
C. ultracentrifugation
D. electron microscopy
E. fluorescence microscopy
Answer: B. gel electrophoresis
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The chance of a child having albinism when both of his parents are heterozygous for the disorder is ____ percent
a. 0 b. 25 c. 33 d. 50 e. 75
Animal viruses have the ability to attach to and enter almost any animal host cell.
Answer the following statement true (T) or false (F)
An evolutionary model of animal development explains how _____.
A. animal body plans are constrained by existing structures in ancestral organisms. B. homeotic genes are not universal among animals. C. homeotic genes are found only in fruit flies, where they are responsible for odd placement of appendages. D. new genetic lines are produced less by modification than by unique mutation. E. somites form as blocks of genes in cells randomly distributed throughout the body.
Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of
A. an experiment. B. a theory. C. deductive reasoning. D. inductive reasoning. E. a hypothesis.