Most of the plant body is composed of ____
a. dermal tissue
b. root tissue
c. ground tissue
d. vascular tissue
e. cork tissue
ANSWER: c
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The plants referred to as C3 and C4 plants get this designation based on the number of carbons in the first detectable product of carbon dioxide fixation. The C3 product is ________, whereas the C4 product is ________.
A) glycerol; malate B) triose phosphate; oxaloacetate C) 3-phosphoglycerate; malate D) ribose; phosphoenolpyruvate E) 3-phosphoglycerate; oxaloacetate
Which of the following enzymes join the
paired sticky ends of DNA fragments? a. reverse transcriptases b. restriction enzymes c. DNA ligases d. DNA polymerases e. polynucleotide kinases
cIn the spiral staircase model of DNA, the handrails
are a. covalent bonds. b. hydrogen bonds. c. nucleotide base pairs. d. phosphate and deoxyribose groups. e. composed of all of these.
Phylogenetic trees can always be regarded as ________ about evolutionary relationships
A) facts B) hypotheses C) guesses D) none of the above