Although the same cell types can be found in both primary and secondary phloem, which type of cell
is usually more abundant in secondary phloem?
a. parenchyma
b. fibers
c. vessel elements
d. companion cells
e. sieve tube members
B
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At which regulation level is DNA uncoiled and loosened from nucleosomes in eukaryotic organisms?
a. At the translational level b. At the epigenetic level c. At the transcriptional level d. At the post-transcriptional level
Which statement is true of embryonic splitting?
a. It never occurs in nature. b. It involves the genetic contribution of only one parent. c. It produces immediate differentiation. d. It is applied in animal husbandry to produce genetically diverse offspring. e. It produces identical twins.
Base excision repair is used to
A) correct base mismatches in newly synthesize DNA. B) fix double-strand DNA breaks. C) remove intercalating agents. D) remove modified or depurinated bases. E) remove intercalating agents and modified or depurinated bases.
Which of the following nutrients begins undergoing chemical digestion in the mouth?
A) amino acids B) protein C) starch D) glucose