Several students were talking about which came first in the history of the Earth. Which student has the best understanding of what happened?
A) Photosynthetic producers must have come first to provide food for other organisms.
B) Anaerobic bacteria must have come first because there was no carbon dioxide in the atmosphere.
C) Photosynthetic producers must have come first to provide oxygen for other organisms.
D) Anaerobic organisms must have come first because there was no oxygen in the atmosphere.
D
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Lymphocytes mature in the _____
I) spleen II) thymus III) bone marrow A) only I and III B) only I and II C) only II and III D) I, II, and III
A molecule or anything else that transports new genes into a cell is called a
(a) vector. (b) plasmid. (c) restriction enzyme. (d) bacterium.
Which hormone is inhibited by hypothalamic somatostatin and can be used to treat short stature in children?
A. insulin-like growth factor I B. testosterone C. estradiol D. cortisol E. growth hormone
A comparison of mitochondria and chloroplasts shows that
A. they have very different electron transport protein complexes. B. only mitochondria contain ATP synthase. C. both use an increase in pH in their inner-membrane space to produce ATP. D. both generate ATP via an H+ electrochemical gradient.