Which cells are alive at maturity?
A. Sieve elements
B. Vessel elements
C. Tracheids
D. Vessel elements and tracheids
E. Sieve elements and vessel elements
Answer: A
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A D-test is set up on a S. aureus isolate. There was no zone around the Erythromycin disk and the zone of inhibition around the clindamycin disk adjacent to the erythromycin disk was inter-preted as susceptible. Thus, the resistance mechanism for the erythromycin is due to:
a. altered target. b. increased efflux. c. decreased porin channels. d. degradative enzymes.
A woman has six fingers, but one of her parents has five fingers. She marries a man who has
five fingers. What is the probability that they will have a child who is homozygous dominant for this trait?
a. 0 percent b. 25 percent c. 50 percent d. 100 percent
The letter B indicates a(n) ____
a. producer b. herbivore c. detritivore d. carnivore e. decomposer
Which of the following statements is true?
(a) Ribosomes are large RNA structures composed solely of rRNA. (b) Ribosomes are synthesized entirely in the cytoplasm. (c) rRNA contains the catalytic activity that joins amino acids together. (d) A ribosome binds one tRNA at a time.