You read that the frequency of a particular disease-associated recessive allele in a population is 12%. What does that mean?
A) 12% of the population has the disease caused by that allele.
B) 12% of the population is a carrier for that disease.
C) For every 100 people, there are 12 copies of the allele.
D) The allele is present in 12% of the cells in your body.
C
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What is the difference between active and passive transport?
a. Passive transport is the movement of materials when the cell is resting rather than when it’s active. b. Passive transport is a pre-expiration activity performed by cells at the end of the cell cycle. c. Active transport, unlike passive transport, requires energy because the movement of materials is against the concentration gradient. d. Active transport moves materials across the membrane, but passive transport retains them on the cytoplasmic side only.
Kidney problems can arise from ____
a. viral infections b. gall stones c. arsenic or lead poisoning d. low protein diets e. high protein diets
Which of the photographs in the above figure
represents the seedless vascular plants? a. moss b. fern c. conifer d. monocot e. all of these
It is estimated that animal-pollinated or insect-pollinated plants produce 1000 pollen grains for each ovule; wind-pollinated plants produce 1,000,000 pollen grains for each ovule. What does that indicate about pollination systems?
A) Wind-pollinated plants rarely produce seeds. B) Wind pollination is more efficient than animal-assisted pollination. C) Wind pollination is less efficient than animal-assisted pollination. D) Wind pollination is costlier to the plant than animal-assisted pollination.