When proteins are broken down into their subunits, what happens to the amino group removed from the
amino acids that are not used to rebuild proteins or other molecules?
a. They are formed into acetyl-CoA.
b. They are converted into pyruvate.
c. They are excreted in theurine.
d. They are stored as glycogen in liver.
e. They are stored in vacuoles in muscle.
ANSWER: c
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Researchers find a group of crocodiles in which an expanded incubation temperature gives rise to male crocodiles. This particular group of crocodiles hatch male crocodiles even with incubation temperatures as low as 29 ?C. What type of scientific approach has led to this observation?
A. Discovery-based science. B. Hypothesis testing.
Cell-mediated responses work against _____
a. intracellular pathogens b. extracellular pathogens c. cancerous cells d. both intracellular pathogens and extracellular pathogens e. both intracellular pathogens and cancerous cells f. intracellular pathogens, extracellular pathogens, and cancerous cells
An extracellular matrix is characteristic of
a. muscle tissue. b. epithelial tissue. c. connective tissue. d. nervous tissue. e. glandular tissue.
At the most basic level of the living world we find
a. atoms. b. cells. c. molecules. d. compounds. e. ions.