If Tina is a carrier, what is the chance that she will have a son with Hemophilia A?
a. No chance (0%). All sons would be normal.
b. She can expect 50% of her sons to have Hemophilia A.
c. All of her sons will have Hemophilia A
d. Not enough data is given.
b
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Which of the following is not a known function of RNAi?
A. directing the replacement of amino acids in an existing polypeptide B. protection against invading RNA viruses C. control of transposon activity D. chromatin structure
Patients with McArdle's Disease lack an enzyme in their livers that catabolizes glycogen. These individuals tire easily during exercise. Which of the following would best explain this symptom?
A. Glycogen is produced from glucose in the blood and then stored in the liver. B. Glycogen synthesis increases the energy available to cells during exercise. C. Glycogen is released from the liver into the blood by the enzyme. D. Glycogen must be broken down to glucose to be used in metabolism.
Contraction of leg muscles aid in the function of which system?
a. digestive b. cardiovascular c. respiratory d. nervous e. endocrine
Which of the following statements about skeletal muscle contraction is false?
(a) When a muscle cell receives a signal from the nervous system, voltage-gated channels open in the T-tubule membrane. (b) The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system cause an influx of Ca2+ into the sarcoplasmic reticulum, triggering a muscle contraction. (c) A change in the conformation of troponin leads to changes in tropomyosin such that it no longer blocks the binding of myosin heads to the actin filament. (d) During muscle contraction, the Z discs move closer together as the myosin heads walk toward the plus ends of the actin filaments.