Each sieve element is associated with a living _____________.
A. root nodule
B. sieve tubes
C. guard cell
D. sieve elements
E. companion cell
Answer: E
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Which pair includes a phase of the cell cycle and a cellular process that occurs during that phase?
A) G1 phase, DNA replication B) G2 phase, preparation for mitosis C) S phase, cell division D) M phase, cell growth
Tracheophyte plants are characterized by all of the following except
A. stomata. B. seeds. C. homosporous or heterosporous. D. a specialized water conducting system. E. a waxy cuticle.
What was the conclusion of the Hershey-Chase experiments?
A. Their results suggested the presence of a transforming principle. B. Their results suggested that DNA is a double helix C. Their results suggested that A+G=T+C D. Their results suggested that the DNA is the genetic material
Proteins are polymers of ____
a. amino acids b. monosaccharides c. steroids d. nucleotides e. phospholipids