What signal, when present at the ribosome, causes protein synthesis to end?
A) DNA
B) tRNA
C) a stop codon
D) RNA polymerase
C
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Answer the following statements true (T) or false (F)
1. In osmosis, water moves from an area of higher to lower solute concentration. 2. If an animal has a concentration of one substance in its body identical to the concentration of that substance in the environment, this will also be the case with all other substances (i.e., if it conforms with one substance, it will conform with all substances). 3. Homeostasis refers to the property of maintaining particular physiological variables such as body temperature and solute concentrations absolutely constant. 4. Positive feedback loops are more common than negative feedback loops in animal physiological function.
During deep sleep, the brain is emitting ____
a. alpha waves b. beta waves c. delta waves d. gamma waves e. theta waves
What feature is common to all the alveolates?
a. heterotrophy b. lung-like sacs used for respiration c. bioluminescence d. complex life cycle with two hosts e. membrane-bound sacs beneath the plasma membrane
The fluid that surrounds all the cells of the body is called interstitial fluid.
a. true b. false