Answer the following statement(s) true (T) or false (F)
1. RNA was probably the first molecule used to encode genetic information; the use of DNA came later. This is due to RNA's inherent stability and its ability to store information more accurately than DNA.
2. Viruses are self-replicating but the replication is much faster in a host cell.
3. Retroviruses are unique because they are a combination of RNA and DNA.
4. Nucleotide analogs are a class of drugs that are highly effective against many types of viruses. They work by halting the replication of viral genes. They are equally effective at stopping the spread of prion diseases.
5. Tetracycline is effective against viruses because it disrupts the action of the viral ribosomes.
1. FALSE
2. FALSE
3. FALSE
4. FALSE
5. FALSE
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An enzyme has a total of four active sites. When you denature the molecule and study its composition, you find that each active site occurs on a different polypeptide. Which of the following hypotheses does this observation support?
A) The enzyme is subject to regulation. B) The enzyme requires a cofactor to function normally. C) The protein's structure is affected by temperature and pH. D) The protein has quaternary structure.
Bacterial genes can be transferred from one bacterium to another by different mechanisms. The newly
introduced DNA can:
a. recombine with DNA already present. b. generate genetic variability. c. exchange alleles between homologous regions from two different individuals. d. allow growth on minimal media e. all of these
what is the etiology of tetanus?
What will be an ideal response?
Antibiotics stop working effectively when antibiotic resistance occurs. Which of the following doesnot contribute to an increase in antibiotic resistance?
A) antibiotics in animal feed B) stopping antibiotics as soon as you feel better C) increase of good bacteria in the body D) taking antibiotics for viral diseases