What is the fate of CoA after it delivers an acetyl group into the citric acid cycle?
a. It is degraded and used for energy.
b. It is recharged with another acetate.
c. It is used in protein synthesis.
d. It remains in an inactive form until the cell dies.
e. It is reused to start glycolysis.
B
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Organisms belonging to the genus Brucella are:
a. gram-positive diplococci. b. gram-positive diphtheroid bacilli. c. gram-negative coccobacilli. d. gram-negative bacilli.
Suppose you wanted to investigate ideas on how polymerization of prebiotic organic molecules may have occurred on the early Earth. Which of the following scenarios might best be utilized for this?
A. Mix some RNA nucleotides in water and heat them to boiling temperatures. B. Mix some amino acids (protein building blocks) in water and add a strong acid or a strong base. C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay. D. Mix some amino acids (protein building blocks) in water and add a bacterium harmless to humans. E. Mix some amino acids in salt water and cool down to 0? C.
While gazing into an aquarium, you observe bubbles coming from an aquatic plant. What are the bubbles and where are they coming from?
What will be an ideal response?
The cytoplasmic membranes of ________ contain unbranched phospholipids and proteins.
A. archaeal cells B. bacterial cells C. eukaryotic cells D. both bacterial and eukaryotic cells E. archaeal, bacterial, and eukaryotic cells