Different ABC transporters can transport
A) ions.
B) sugars.
C) amino acids and peptides.
D) polysaccharides.
E) All of the above are correct.
Answer: E
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Which of the following is not well supported by evidence as a likely cause of the P-T mass extinction?
A. bolide impact B. competition for resources C. oceanic turnover D. global warming E. volcanism
A novice gardener notices that many plants in his garden look wilted. What osmotic solution would you suggest the novice gardener use to best return the plants to full health?
A. Place the plants in a 15% solute solution so water can be actively transported out of the plant cells. B. Place the plants in a 15% solute solution so water can diffuse out of the plant cells. C. Place the plants in a 5% solute solution so water can be actively transported out of the plant cells. D. Place the plants in a 5% solute solution so water can diffuse into the plant cells.
Which of the following represents an early stage in primary succession?
A. Pine trees B. Moss and lichens on bare rock C. Weedy annual plants in an open field D. Climax species in succession E. Alder, cottonwood, and willow thickets
In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. If a plant
that is heterozygous for both flower color and seed color genes is self-fertilized, what proportion of the offspring will have one of the dominant phenotypes, either the seed color or flower color, but not both? A) 9/16 B) 9/32 C) 6/64 D) 6/16 E) 6/32