What is the role of the enzyme ligase in DNA replication?
A. It seals any breaks in the sugar-phosphate backbone.
B. It breaks the hydrogen bonds that hold the two strands of the DNA together.
C. It unzips the double-stranded DNA.
D. It matches new bases to the old strand by complementary base pairing.
E. It folds the DNA into a coiled structure.
Answer: A
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Which plants resemble palm trees (but are not close relatives), and contain toxins that increase the risk of neurodegenerative disorders and cancer?
a. tree ferns b. conifers c. gnetophytes d. ginkos e. cycads
A central vacuole of a mature plant cell
A. stores genetic information. B. produces protein. C. produces energy from nutrients. D. produces turgor pressure. E. produces mRNA.
Of all organisms, prokaryotes are
a. the smallest. b. the most abundant. c. the most metabolically diverse. d. the most widespread. e. all of these
Which of the following best describes mollusks?
A) They have radial body symmetry and a soft body always covered with a shell. B) They are bilaterally symmetrical and have a soft body always covered with a shell. C) They have radial body symmetry and a soft body sometimes covered with a shell. D) They are bilaterally symmetrical and have a soft body sometimes covered with a shell.