According to the endosymbiont hypothesis, what cellular components originated from free-living bacterial cells?
a. mitochondria and nucleus
b. nuclei and ribosomes
c. chloroplasts and ribosomes
d. chloroplasts and mitochondria
e. endoplasmic reticulum and mitochondria
D
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Support the argument that species in the grass family, Poaceae, are the most important seed plants today
What will be an ideal response?
DNA Polymerase III
A. unzips the DNA helix. B. proofreads new DNA. C. synthesizes the primer. D. joins Okazaki fragments. E. removes the primer.
Which statement concerning neurotransmitter release at the effector is true?
a. Preganglionic parasympathetic neurons release serotonin. b. Preganglionic sympathetic neurons release norepinephrine. c. Postganglionic parasympathetic neurons release norepinephrine. d. Postganglionic sympathetic neurons release acetylcholine. e. Postganglionic sympathetic neurons release norepinephrine.
Weather patterns that occur over years or centuries in a particular region make up its ________
Fill in the blank(s) with correct word