What enzymes hydrolyze proteins, releasing amino acids?
A. Tranaminases
B. Decarboxylases
C. Deaminases
D. Proteases
Answer: D
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The Gram-negative chlamydiae are ________.
A. Gram-positive, spore-forming rods B. obligate intracellular parasites C. motile due to periplasmic flagella D. photosynthetic
Which of the following is the concept associated with an animal shivering in a cold environment to stay warm?
A) homeostasis B) conformer C) counter current heat exchange D) torpor
Amoxicillin is very effective for treating infections with Gram-positive bacteria but rarely causes side effects in humans. This is an example of
A) selective toxicity. B) narrow spectrum of action. C) a broad-spectrum antimicrobial. D) antibiotic resistance. E) altruism.
You explain to a friend what you have learned about Avogadro's number. Your friend thinks the number is so large that he doubts there is even a mole of living cells on the Earth
You have recently heard that there are about 50 trillion (5 × 1013) human cells in each adult human body and that each human contains more bacterial cells (in the digestive system) than human cells, so you bet your friend $5 that there is more than a mole of cells on Earth. The human population is approximately 7 billion (7 × 109). What calculation can you show your friend to convince him you are right?