Which information was determined about DNA based on X-ray diffraction data?
A) Each gene encodes one enzyme.
B) DNA has a helical structure.
C) There are four different bases on the nucleotides.
D) Chromosomes are made of DNA.
E) Point mutations change a single location in the genome.
Answer: B
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Why would bacteria evolve so that the presence of tryptophan inhibits its own production?
A. Producing the enzymes that synthesize tryptophan is metabolically expensive, so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary. B. Producing high levels of tryptophan inhibits the production of other amino acids, so inhibiting its production allows all amino acids to be synthesized at equal concentrations. C. High levels of tryptophan causes cells to become unresponsive to external stimuli, so its production must be regulated. D. High levels of tryptophan inhibit cellular respiration and the synthesis of ATP, so its production must be regulated. E. All of these choices are TRUE
If one strand of DNA has the nitrogenous base sequence ATTCGACGCTA, then the complementary strand has the nitrogenous base sequence
TAAGCTGCGAT. ATCGCAGCTTA. UAAGCUGCGAU. ATTCGACGCTA
An atom X contains 14 protons, 13 electrons, and 12 neutrons, and atom Y contains 14 protons, 14 electrons, and 12
neutrons. What can you conclude? a. Y is an ion but X is not. b. X and Y are both ions. c. X and Y both have filled valence shells. d. X and Y are isotopes of the same element. e. X and Y are atoms of the same element.
Proteins contain both acidic and basic R groups and can, therefore, function as
A) energy storage macromolecules. B) structural macromolecules. C) buffers. D) catalysts. E) genetic material.