In the Krebs cycle, citrate forms when combines with the two carbons of acetyl CoA.
A. oxygen
B. a cytochrome
C. pyruvate
D. NADH
E. oxaloacetate
E. oxaloacetate
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Endolithic phototrophic communities are MOST common in ________ environments
A) dry B) hot C) humid D) windy
The geologic time scale is subdivided on the
basis of a. the appearance of different radioactive isotopes in different strata. b. levels of background extinction. c. periods of mass extinction. d. the appearance of different radioactive isotopes in different strata and levels of background extinction. e. the appearance of different radioactive isotopes in different strata, levels of background extinction, and periods of mass extinction.
The above figure represents
a. petunia eggs. b. pine pollen. c. pansy spores. d. petal fragments. e. poppy seeds
Which situation has contributed to widespread antibiotic resistance?
A) doctors underprescribing antibiotics that would eradicate cold-causing bacteria B) patients finishing their antibiotic prescription even though they feel better C) farmers using an abundance of antibiotics to treat feedlot animals D) chefs cooking meat thoroughly in restaurants