All populations of different species living and interacting within an ecosystem are referred to collectively as a(n)
A) community.
B) biome.
C) population.
D) ecosystem.
A
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Which of the following is NOT true of enzyme behavior?
a. Enzyme shape may change during catalysis. b. Enzymes cannot make something happen that would not happen on its own. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzymes speed up reactions.
Refer to the following diagram of a generalized tetranucleotide to answer questions (a) through (e)
(a) Is this a DNA or an RNA molecule? ________ (b) Place an "X" (in one of the circles in the diagram) at the 3' end of this tetranucleotide. (c) Given that the DNA strand, which served as a template for the synthesis of this tetranucleotide, was composed of the bases 5' – A C A G – 3', fill in the parentheses (in the diagram) with the expected bases. (d) Suppose that one of the precursors for this tetranucleotide was a 32P-labeled guanine nucleoside triphosphate (the innermost phosphate containing the radioactive phosphorus). Circle the radioactive phosphorus atom as it exists in the tetranucleotide. (e) Given that spleen diesterase (breaks between the phosphate and the 5' carbon) digests the pictured tetranucleotide, which base(s) among the breakdown products would be expected to be attached to the 32P? Fill in the blank(s) with correct word
Why can evolution in mosquitoes be more easily observed than evolution in a population of squirrels?
A) Mosquitoes have a shorter generation time. B) Mosquitoes have a higher mutation rate. C) Mosquitoes feed only on blood. D) Mosquitoes lay eggs rather than bear live young.
How does methyl mercury affect living things?
A. It inhibits the electron transport chain during cellular respiration. B. It inhibits transcription. C. It precipitates proteins. D. It interferes with translation of mRNA. E. It interferes with DNA replication.