To which of the following does the term heteroplasmy refer?
A) various stages of development of mitochondria and chloroplasts
B) cells with a variable mixture of normal and abnormal organellar genomes
C) conditions in which the germ plasm is a mixture of dominant and recessive genes
D) a circumstance that is homologous to incomplete dominance
E) heterozygous individuals with more than one gene pair involved
Answer: B
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Gamma rays cause biological damage in living systems by
A. producing reactive molecules such as superoxide and hydroxyl-free radicals. B. causing tiny gravity sinks and black holes to be formed in the substance. C. introducing toxins. D. making the substance radioactive.
The tropical supralittoral zone immersed only at the highest spring tides is the:
a. brown. b. white. c. gray. d. black. e. yellow.
All of the following teeth are found in adult vertebrates except
A. precanines. B. molars. C. incisors. D. premolars. E. canines.
Inoculating loops and needles are typically sterilized by holding in the flame of a Bunsen burner until red-hot. Alternatively,
What will be an ideal response?