Genetics chapter 13rename
livelove90's version from 2012-04-02 14:43
|Which of the following are among the major components of prokaryotic ribosomes? |
A)12S rRNA, 5.8S rRNA, and proteins
B)16S rRNA, 5.8S rRNA, and 28S rRNA
C)16S rRNA, 5S rRNA, and 23S rRNA
D)lipids and carbohydrates
E)18S rRNA, 5.8S rRNA, and proteins
|The term peptidyltransferase relates to |
A)base additions during mRNA synthesis.
B)peptide bond formation during protein synthesis.
C)elongation factors binding to the large ribosomal subunit.
D)discontinuous strand replication.
E)5' capping of mRNA.
|The one-gene:one-enzyme hypothesis emerged from work on which two organisms? |
A)E. coli and yeast
B)Drosophila and humans
C)Neurospora and humans
D)E. coli and humans
E)all of the above
|The chain of adult hemoglobin is composed of a known sequence of 146 amino acids. In comparing the normal chain with the chain in sickle-cell hemoglobin, what alteration is one likely to find? |
A)valine instead of glutamic acid in the sixth position
B)glutamic acid replacing valine in the first position
C)extensive amino acid substitutions
|The primary structure of a protein is determined by |
A)the sequence of amino acids.
B)hydrogen bonds formed between the components of the peptide linkage.
C)a series of helical domains.
E)covalent bonds formed between fibroin residues.
|One form of posttranslational modification of a protein includes |
A)removal of introns.
B)shuffling of exons.
C)removal or modification of terminal amino acids.
D)removal of exons.
|Which protein class directly controls many of the metabolic reactions within a cell? |
|The secondary structure of a protein includes the following features: |
A)gamma and delta domains.
B)alpha and gamma domains.
C) -helix and -pleated sheet.
|Side groups of amino acids are typically grouped under which of the following categories? |
|A protein is 300 amino acids long. Which of the following is the minimum number of nucleotides in the section of DNA that codes for this protein? (Remember, DNA is double-stranded.) |
|By their experimentation using theNeurospora fungus, Beadle and Tatum were able to propose the far-reaching hypothesis that |
A)prototrophs will grow only if provided with nutritional supplements.
B)several different enzymes may be involved in the same step in a biochemical pathway.
C)the role of a specific gene is to produce a specific enzyme.
D)genetic recombination occurred inNeurospora.
E)more than one codon can specify a given amino acid.
|A short segment of an mRNA molecule is shown below. The polypeptide it codes for is also shown:5'-AUGGUGCUGAAG:methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.) |