What did Mendel propose to explain the 3:1 ratio of dominant to recessive traits he observed in his pea plants?
a. Plants expressing dominant traits carry three copies of the genes for those traits versus only one copy for recessive traits.
b. Plants with dominant traits were 300% more likely to survive to maturity after fertilization when they could be observed.
c. Each plant had two copies of each trait, and recessive traits were only expressed if both copies were the recessive form.
d. All pea plants contain the same genetic material, but dominant pea plants express traits three times more strongly than others.
c. Each plant had two copies of each trait, and recessive traits were only expressed if both copies were the recessive form.
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Which trait does the fossil in the accompanying figure share with modern birds?
a. long, clawed fingers on each forelimb b. teeth c. Feathers d. long bony tail e. heavy jaw
Which of the following does not occur in pulmonary emphysema?
a. The alveoli lose their elasticity. b. The surface area of the lung is greatly increased. c. Walls between adjacent alveoli become destroyed. d. The heart becomes enlarged from overexertion. e. Stale air accumulates in the lungs because it cannot be properly expelled.
Describe the main functions of the plasma membrane
What will be an ideal response?
Which of the following is NOT a membrane-disrupting toxin?
A) A-B toxin B) hemolysin C) leukocidin D) streptolysin O E) streptolysin S