Most often, the largest gradient in water potential is between
A. xylem and phloem.
B. leaf cells and the intracellular spaces inside the leaves.
C. the relative humidity inside the leaf and the relative humidity outside the plant.
D. roots and soil water.
E. root xylem and shoot xylem.
Answer: C
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1.cell marker proteins 2.channel proteins 3.protein receptors 4.transport proteins
If a child more strongly resembles one parent's physical traits than the other parent's, the explanation could be due to chromosome movements during
A) prophase II. B) anaphase II. C) metaphase II. D) telophase I. E) anaphase I.
In an area with nitrogen-poor soil, legumes often dominate over other plants because they
A) have long taproots that can extract nitrogen from deeper down in the soil. B) inhibit the growth of denitrifying bacteria around their roots, thus keeping more nitrate in the soil. C) have unique access to the large atmospheric pool of nitrogen thanks to their symbiotic bacteria. D) obtain supplemental nitrogen by trapping insects and other prey. E) do not need nitrogen at all.
Which of the following statements concerning nucleic acids is CORRECT?
A. Nucleic acid strands are held together by hydrogen bonds between adjacent carbohydrates. B. Cellular DNA is double stranded. C. All viruses have DNA genomes. D. The nucleic acid polymer is composed of peptide bonds. E. There are three naturally occurring purines in nucleic acids.