Birds have a crop that is modified for:
a. digestion of cellulose
b. food storage
c. mechanical breakdown of food
d. digestion of fats
e. storage and elimination of undigested food
b
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Why are mitochondria so prevalent in skeletal muscle?
A) They give the muscle enough elasticity to contract. B) They are needed to repair damaged tissue that accumulates during exercise. C) They are needed to provide energy for muscle contraction. D) Bones and muscles require a great deal of energy to prevent them from separating. E) The flow of blood is greatest in skeletal muscle.
Differential gene expression can result from two different genes sharing what in common?
a. enhancer b. distal control elements c. promoter d. activators
The spontaneous generation of living things from nonliving things was thought to be common many years ago. Louis Pasteur used specially constructed flasks with a long S-shaped neck to prove that
A. spontaneous generation of organisms occurred in broth in the flasks. B. oxygen was required to have living things present in the broth. C. microorganisms had to enter the flask to get the broth to "spoil." D. the broth "spoiled" even if organisms were not present.
A student notes that an individual has attached earlobes, a recessive trait in humans. A cell is taken from this individual, and the alleles for the trait are isolated. What is the probability that one of the alleles was inherited from the individual's mother?
A. 0% B. 50% C. 75% D. 100%