Which of these covalently modifies proteins by phosphorylation?
A. enzymes called protein phosphatases
B. other proteins called allosteric proteins
C. any ligand that can bind to specific binding sites
D. enzymes called protein kinases
E. metal ions, such as Fe2+
D
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Compared to type 1 (slow oxidative) skeletal muscle fibers, how are type 2X (fast-glycolytic) skeletal muscle fibers different?
A. Type 2X fibers fatigue more readily. B. Type 2X fibers have more abundant myoglobin. C. Type 2X fibers are smaller in diameter. D. Type 2X fibers have more abundant mitochondria. E. Type 2X motor units contain fewer fibers per alpha motor neuron.
A cytokine produced by cells in response to invasion by a virus is ________
A) Interferon B) Interleukin C) Mucus D) Complement
When our brains process visual information about objects directly in front of us, they are able to use information that compares signals from the two eyes (steroscopic vision) in order to provide
A. color perception. B. brightness levels. C. depth perception. D. motion detection.
Muscle strength peaks in a/an ________.
A. elderly adult B. middle aged adult C. adolescent D. young adult E. child