Explain why microbial cells are excellent models for understanding cell function in higher organisms
What will be an ideal response?
Answer: Answers will vary but should include commonality of function, biochemical and genetic similarities, and ease and speed with which they can be grown in large quantities.
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One of the findings of the human genome project is that humans vary by
a. introns. b. exons. c. SNPs. d. codons. e. deviant bases.
The body system which functions to regulate the activities of other body systems by secreting chemical messengers called hormones is the
A. endocrine system. B. cardiovascular system. C. nervous system. D. respiratory system.
What type of reproductive isolation would include closely related species of orchids that never mate in the wild because they bloom at different times?
What will be an ideal response?
Which one of the following does not match a component of the amniotic egg with its primary function?
A. amnion-encloses embryo within an oxygen-filled cavity B. yolk sac-provides food for the embryo C. allantois-segregates nitrogenous wastes from embryo D. chorion-exchange of respiratory gases; retention of water E. shell-porous, protective covering