please answer all of the questions, just answers please. I haven't got a clue what this is all about
____ 5. Which of the following is associated with
a. allosterism b. allotropism c. isomerization d. racemization
____ 6. Which of the following is commonly associated with protein modification?
a. phosphorylation c. both (a) and (b)
b. dephosphorylation d. neither (a) nor (b)
____ 7. Which of the following are discrete bodies within cells?
a. nuclei c. both (a) and (b)
b. mitochondria d. neither (a) nor (b)
____ 8. Which of the following can be the target of a neurotransmitter?
a. a muscle cell c. a neuron
b. the cell of a gland d. all of these
____ 9. Which of the following hormones is produced in the kidney?
a. insulin b. glucagon c. renin d. vasopressin
____ 10. Which of the following is a secondary messenger associated with acetylcholine?
a. Ca2+ b. K+ c. Mg2+ d. Na+
____ 11. Which of the following is true of the receptor site for amino acid neurotransmitters?
a. all amino acids have a common receptor site
b. each amino acid has its own receptor sites
c. there are four different types of receptor sites corresponding to the four different types of side chains on the amino acids
d. none of the above is true
____ 12. Which of the following diseases is associated with insufficient dopamine?
a. Alzheimer's b. cholera c. Parkinson's d. none of these
____ 13. Which of the following is where genetic information is located?
a. chromosomes c. histones
b. endoplasmic reticulum d. ribosomes
____ 14. Where are genes located?
a. in the cytoplasm c. in the lipid bilayer
b. in the endoplasmic reticulum d. in the nucleus
____ 15. Which of the following is true of DNA and RNA?
a. both are found in chromosomes
b. DNA is found in chromosomes, but RNA is not
c. RNA is found in chromosomes, but DNA is not
d. neither is found in chromosomes
____ 16. How many different components make up a nucleoside?
a. 1 b. 2 c. 3 d. 4
____ 17. Which pair of bases is linked together by two hydrogen bonds?
a. adenine and guanine c. guanine and cytosine
b. adenine and thymine d. guanine and thymine
____ 18. Ribosomes are made up of how many subunits?
a. 1 b. 2 c. 3 d. 4
____ 19. Which of the following is true of the two daughter strands of DNA?
a. they are both synthesized continuously
b. they are both synthesized discontinuously
c. the lagging strand is synthesizes continuously, but the leading strand is synthesized discontinuously
d. the leading strand is synthesizes continuously, but the lagging strand is synthesized discontinuously
____ 20. Which of the following is involved in unwinding the DNA double helix?
a. acetylase b. helicase c. binding proteins d. polymerases
____ 21. The size of ribosomal subunits is given in "S" units. "S" stands for which of the following?
a. selectivity c. Svedberg units
b. size d. synthesizing ability
____ 22. tRNA has a shape similar to which letter of the alphabet?
a. C b. L c. S d. T
____ 23. How many stop codons are there?
a. 1 b. 3 c. 4 d. 20
____ 24. It is now known that there are approximately how many genes in the human genome?
a. 10,000 b. 30,000 c. 100,000 d. 1,000,000
____ 25. Approximately how often does an error occur during DNA replication?
a. 1 in a million b. 1 in a 10 million c. 1 in a billion d. 1 in 10 billion
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