Triggers K+ to pass rapidly out of guard cells.
Choose the letter of the best match:
A. abscisic acid
B. trichomes
C. aquaporin
D. endodermis
E. stoma
A. abscisic acid
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In seed plants, meiosis produces ____ megaspores, however ____ leaving a single functional megaspore to produce a
____ gametophyte.
a. four; three disintegrate; male b. four; three disintegrate; female
c. eight; seven disintegrate; female d. two; one disintegrates; male e. two; one disintegrates; female
Although Lamarck's hypothesis was wrong, it is significant. Why?
What will be an ideal response?
Lyme disease is caused by a bacterium found in the bloodstream of small woodland rodents such as mice or chipmunks and also found occasionally in deer. Yet humans get this disease without coming into direct contact with either rodents or deer
Explain the concept of a biological vector, and discuss how humans contract Lyme disease.
A PCR was designed to clone a DNA sequence of 1.5 kb. When the products were run on an agarose gel, there was a smear of bands ranging from 1.5 kb to 6 kb. Which of the following is a reason for this result?
A) the thermocycler malfunctioned B) one of the primers did not bind C) the polymerase overran the reverse primer D) the polymerase denatured