What is used to cut DNA in generating recombinant DNA?
A) restriction enzymes B) primers
C) bacteriophage D) plasmids
Answer: A
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RNA viruses require their own supply of certain enzymes because _____
A) host cells rapidly destroy the viruses B) host cells lack enzymes that can replicate the viral genome C) these enzymes translate viral mRNA into proteins D) these enzymes penetrate host cell membranes E) these enzymes cannot be made in host cells
Which of the following is true of the structure of the TPP riboswitch only when bound to thiamine pyrophosphate?
A. The conformation of the riboswitch allows the ribosome to access the Shine-Dalgarno sequence. B. The riboswitch folding creates a binding site for the ribosome. C. The riboswitch RNA becomes catalytically active to cleave mRNA. D. The riboswitch is less susceptible to cleavage by ribonuclease.
Matching. Choose the most appropriate answer for
each. 1. ___ millipede 2. ___ annelids 3. ___ arthropods 4. ___ placozoan 5. ___ cnidarians 6. ___ echinoderms 7. ___ flatworms 8. ___ rotifers 9. ___ mollusks 10. ___ roundworms 11. ___ sponges A. two pairs of legs per segment B. tiny, flattened, crawling forms C. planarians, flukes, tapeworms D. nematodes E. snails, squids, clams F. wheel animals G. flagellated collar cells present H. jellyfish and corals I. crustaceans, ticks, and insects J. polychaetes, earthworms, leeches K. sea urchins, sea stars
What is facilitated diffusion
What will be an ideal response?