Which of the following is a component of phloem?

A. Tracheids
B. Sclerenchyma cells
C. Epidermal cells
D. Cork cambium
E. Collenchyma cells


Answer: B

Biology & Microbiology

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Suppose that in studies of genes on the same chromosome you find the following recombination frequencies:Figure

13.1 In this case, it would be proper to say that a, c, and b are ____.

a. linked genes b. different alleles of the same gene c. a trisomy resulting from nondisjunction d. linked genes that are not physically possible since the recombination frequencies do not add up e. three inverted genes

Biology & Microbiology

Puppies born too large experience difficulties

in birthing and tend to have respiratory and other problems. Puppies born too small often can’t compete with their siblings for their mother’s milk. Thus, puppies born not too large or too small have a survival advantage. This is an example of ___ selection.

a. directional b. stabilizing c. disruptive d. frequency e. more than one of these types of

Biology & Microbiology

What type of bond is formed between amino acids?

a. glycosidic b. covalent c. coordinate covalent d. peptide e. network

Biology & Microbiology

If you add a drug that causes the voltage gated Na+ channel to take a longer time to inactivate, which of the following would you expect to observe? AP = action potential. [Choose all that apply.]

Group of answer choices A. The peak of the AP would be at an even more positive membrane potential than normal B. The width of the AP would be thinner than normal. C. An AP would fail to be initiated D. The AP would now go in both directions down an axon. E. The threshold potential would decrease compared to normal. F. The peak of the AP would be at a positive membrane potential closer to zero than normal

Biology & Microbiology