From the outside to the inside, which is the correct order of tissues in a eudicot root?
a. epidermis>>cortex>>endodermis>>vascular tissue
b. epidermis>>endodermis>>vascular tissue>>cortex
c. endodermis>>cortex>>epidermis>>vascular tissue
d. epidermis>>vascular tissue>>endodermis>>cortex
e. endodermis>>epidermis>>cortex>>vascular tissue
ANSWER: a
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A. to generate a concentration gradient between the inner medulla and outer cortex. B. to dilute the filtrate passing through the loop. C. to concentrate the filtrate passing through the loop. D. selective reabsorption of glucose and other solutes into the bloodstream. E. active secretion of other wastes from the bloodstream.
The waterproof cuticle covering the epidermis of land plants helps prevent dehydration, much like the skin of some land animals. As a consequence of having a cuticle, what other evolutionary adaptation was important for most land plants?
A. the endodermis in the root B. root hairs on the root epidermis C. collenchyma fibers just beneath the surface of the epidermis D. stomata in the leaves E. trichomes on leaf surfaces
Crop plants have been protected from certain insects by the addition of a gene for a specific insect toxin from the bacterium
A. Agrobacterium tumefaciens. B. Bacillus thuringiensis. C. tobacco mosaic. D. Herpes simplex. E. Pseudomonas.
Which of the following has the fewest nucleotides in its strand?
A) mRNA, having 75 nucleotides B) Protein, having 40 amino acids C) mRNA, having 50 codons D) mRNA, having 100 bases E) Protein, with 2 polypeptides, each having 35 amino acids