Biological evolution differs from chemical evolution in that it would have been possible only after the development of
A. a metabolic pathway.
B. enzymes.
C. true cells.
D. nucleic acids.
Answer: C
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Cancers of nerve tissues in the brain are called ____
a. sarcomas b. leukemia c. gliomas d. lymphomas e. adenocarcinomas
In DNA, pyrimidines are covalently bonded to the pentose sugar. Which one of the following statements is correct?
a. the 1'C of the sugar is covalently bonded to N1 in the pyrimidine ring b. the 1'C of the sugar is covalently bonded to N9 in the pyrimidine ring c. the 1'C of the sugar is hydrogen bonded to N9 in the pyrimidine ring d. the 1'C of the sugar is hydrogen bonded to N1 in the pyrimidine ring
What are the small green appendages that might be found at the base of a leaf’s petiole called?
a. leaflets b. lamina c. stipules d. cuticles
Which of the following is a monomer of
protein?
a. nucleotide b. monosaccharide c. simple sugar d. amino acid e. ribose