Which of the following would most likely diffuse across a synapse?
a. insulin
b. NO
c. histamine
d. acetylcholine
e. prostaglandins
D
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The two major categories of extracellular signal molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones b. steroid hormones and neurotransmitters c. neurotransmitters and vitamins d. growth hormones and vitamins e. peptide hormones and neurotransmitters
Pyoderma in dogs is caused by
A. Staphylococcus aureus B. Staphylococcus intermedius C. Staphylococcus pyogenes D. Staphylococcus epidermidis E. Staphylococcus saprophyticus
To observe the three-dimensional structure of a cell the best type of microscopy would be
A. scanning electron microscopy. B. fluorescence microscopy. C. standard light microscopy. D. differential-interference light microscopy. E. transmission electron microscopy.
Which of the following hormones is mispaired with its target organ?
A. FSH-gonads B. TSH-thyroid C. ACTH-adrenal cortex D. Gonadotropic hormones-testes and ovaries E. LH-kidney