Discuss theories regarding the origins of viruses and make a case for whether viruses originated before cellular life-forms or after cellular life-forms.
What will be an ideal response?
Answers will vary.
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An individual basidium ultimately produces
A. eight diploid spores. B. four genetically identical haploid spores. C. four haploid spores, each genetically different. D. eight identical haploid spores. E. eight haploid spores, of which there are two each of four different genetic types.
Mechanisms that evolved in plants to regulate the rate of water loss do not include
A. becoming dormant during dry times of the year. B. losing leaves. C. producing leaves that are thick and hard. D. containing stomata in crypts or pits. E. increasing the number of water vacuoles in the cells.
The adrenal glands are found at the top of the
A. ovaries. B. pancreas. C. kidneys. D. thyroid gland. E. liver.
The number of DNA molecules in a duplicated
chromosome is a. one. b. undetermined. c. half that of an unduplicated chromosome. d. two. e. four.