Which of the following is a correct description of a component of the ATP molecule?
A. High energy bond: glycosidic bond
B. High energy bond: peptide bond
C. Sugar: ribose
D. Sugar: deoxyribose
E. Nitrogenous base: alanine
Answer: C
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The rate of background extinction is
A. 0.1 to 1.0 species per year per million species. B. 0.001 to 0.01 species per year per million species. C. 1.0 to 10 species per year per million species. D. 10 to 100 species per year per million species. E. None of the answers are correct.
Which of the following is NOT an example of a walled-off site of infection that contains a fluid made of dead and dying tissue cells, leukocytes, and pathogens?
A) a boil B) an abscess C) a pimple D) a pustule E) a tumor
Which phylum do roundworms belong to?
A. porifera B. arthropoda C. nematoda D. cnidaria
When ________ is blocked, some algae and cyanobacteria can carry out anoxygenic photosynthesis using compounds other than ________ as an electron source
a. PSI / H2 b. PSI / water c. PSII / H2 d. PSII / water