Which type of chemical bond exists within a water molecule?
A. weak
B. covalent
C. hydrogen
D. ionic
E. It depends on the temperature of the water.
Answer: B
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Epinephrine blocks the contraction of muscles in the airways. Which of the other activities of epinephrine is most likely to be regulated by the same type of pathway?
A. Increased sweating. B. Stimulation of heart muscle cell contraction. C. Promotes the breakdown of glycogen in skeletal muscle cells D. Inhibition of saliva production in salivary glands E. Contraction of smooth muscle cells in blood vessels.
Which organism is part of the trophic level that stores 10% of the initial amount of solar energy that has entered the food web?
a) snake b) hawk c) tree d) deer
How is bacterial translation different from eukaryotic translation?
a. mRNA is read 3' to 5'. b. Bacteria can begin translation before transcription has terminated. c. Bacterial translation does not involve ribosomes.
The secretion of which hormones qualifies the pancreas as an endocrine gland?
A. digestive juices and glucagon B. mineralocorticoids and insulin C. estradiol and digestive juices D. insulin and glucagon E. insulin and digestive juices