Which of the following statements about muscular dystrophy (MD) is false?
a. Duchenne MD is caused by a mutation on the X chromosome
b. In all forms of MD, skeletal muscle progressively weakens.
c. Children affected by Duchenne MD usually show signs by age three.
d. Duchenne MD affects boys and girls in equal numbers.
d
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Almost all cases of cystic fibrosis, a(n) ____ genetic disorder, are the result of mating between two unaffected parents
a. mitochondrial b. autosomal dominant c. autosomal recessive d. X-linked dominant e. X-linked recessive
Proteins are made of building blocks called what?
A) amino acids B) lipids C) carbohydrates D) nucleic acids
Micronutrients are needed in very small amounts because _____
A) most of them are mobile in the plant B) most serve mainly as cofactors of enzymes C) they play only a minor role in the growth and health of the plant D) only the most actively growing regions of the plants require micronutrients
A typical aerobic exercise prescription consists of 3-5 days/week for 20 or more minutes per session at 70-90% of maximal heart rate. More than this yields no improvements in fitness.
a. true b. false