The water strider is an insect that skates across the water without sinking. The tips of its feet must be coated with molecules that are
What will be an ideal response?
hydrophobic
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E. corrodens can be easily recognized in culture by its:
a. pink pigmentation. b. grapelike odor. c. large spreading colonial morphologic characteristic. d. bleachlike odor.
What determines the sequence of the amino acids in a particular protein?
a. its primary structure b. the sequence of nucleotides in RNA, which was determined by the sequence of nucleotides in the gene for that protein c. the sequence of nucleotides in DNA, which was determined by the sequence of nucleotides in RNA. d. the sequence of RNA nucleotides making up the ribosome e. the three-dimensional shape of the protein
What is the type of microscope that is used nearly always to observe this specimen?
A) scanning electron microscope B) stereomicroscope C) monocular microscope D) transmission electron microscope
It has been proposed that the first cells used RNA for both information storage and catalysis and that DNA and proteins evolved later. Which modern macromolecules may be relics of the hypothesized RNA world?
A. RNA polymerase B. ribosome C. spliceosome D. sigma factor