Chapter 17 - Bio 1201 QUESTIONS AND ANSWERS
The flow of information in a cell proceeds in what sequence?
A. from RNA to DNA to protein
B. from RNA to protein to DNA
C. from DNA to protein to RNA
D. from DNA to RNA to protein
E. from protein to RNA to DNA
D. from DNA to RNA to protei...
The flow of information in a cell proceeds in what sequence?
A. from RNA to DNA to protein
B. from RNA to protein to DNA
C. from DNA to protein to RNA
D. from DNA to RNA to protein
E. from protein to RNA to DNA
D. from DNA to RNA to protein
A codon consists of _____ bases and specifies which _____ will be inserted into
the polypeptide chain.
A. two ... nucleotide
B. four ... fatty acid
C. three ... amino acid
D. three ... nucleotide
E. four ... amino acid
C. three ... amino acid
Where does RNA polymerase begin transcribing a gene into mRNA?
A. Transfer RNA acts to translate the message to RNA polymerase.
B. The ribosome directs it to the correct portion of the DNA molecule.
C. It starts at one end of the chromosome.
D. It starts after a certain nucleotide sequence called a promoter.
E. It looks for the AUG start codon.
D. It starts after a certain nucleotide sequence called a promoter.
,What is the function of RNA polymerase?
A. It adds nucleotides to the 5' end of the growing mRNA molecule.
B. It proceeds slowly along the DNA strand, requiring about a minute to add two
nucleotides to the growing mRNA molecule.
C. It relies on other enzymes to unwind the double helix.
D. It unwinds the double helix and adds nucleotides to a growing strand of RNA.
E. All of the above.
D. It unwinds the double helix and adds nucleotides to a growing strand of RNA.
After an RNA molecule is transcribed from a eukaryotic gene, what are removed
and what are spliced together to produce an mRNA molecule with a continuous
coding sequence?
A. promoters ... operators
B. operators ... promoters
C. exons ... introns
D. introns ... exons
E. silencers ... enhancers
D. introns ... exons
What is a ribozyme?
A. a DNA sequence near the promoter that assists in the binding of RNA
polymerase
B. an enzyme that holds open the DNA double helix while RNA polymerase adds
nucleotides
C. a mutated ribosome
D. a biological catalyst made of RNA
E. a biological catalyst consisting of DNA
D. a biological catalyst made of RNA
Which one of the following is true of tRNAs?
A. tRNAs carry special sequences known as codons.
B. tRNAs are double-stranded.
, C. There are four types of tRNA.
D. Each tRNA binds a particular codon.
E. All of the above.
F. None of the above.
F. None of the above.
How is translation initiated?
A. The small ribosomal subunit binds to the mRNA.
B. The tRNA bearing methionine binds to the start codon.
C. The large ribosomal subunit binds to the small one.
D. The start codon signals the start of translation.
E. All of the above.
E. All of the above.
What does a mutagen cause?
A. problems with mitosis
B. decreased enzyme activity throughout the cell
C. a reduction in the number of tRNA molecules available for protein synthesis
D. decreased permeability of the nuclear envelope
E. a change in the sequence of DNA
E. a change in the sequence of DNA
Which of these is currently considered the best definition of a gene?
A. A gene codes for a single enzyme.
B. A gene codes for a single polypeptide.
C. A gene codes for a particular ribozyme.
D. A gene codes for a single protein.
E. A gene codes for either a polypeptide or an RNA molecule.
E. A gene codes for either a polypeptide or an RNA molecule.
The genetic code is essentially the same for all organisms. From this, one can
logically assume which of the following?
A. The same codons in different organisms translate into the different amino
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