Chapter 9
there are how many different types of amino acids
20
the genetic code is made up of units consisting of how many nucleotides
3
how many different RNA codons are listed on the Genetic Code chart
64
if the fourth base from the left (C) in RNA were deleted, what would the new 3rd codon be?
CUG
the two steps of transCription followed by transLation
describe the flow of genetic information
Of all the different codons that exist, three of them
do not specify a particular amino acid and provide instructions such as STOP
the portion of the DNA mol that is NOT translated and is a non-coding portion of DNA is called
exons
the portion of the DNA molecule that is translated is composed of
exons
what stage of translation occurs when ribosomal subunits & tRNAs converge around a mRNA transcript
initiation
which event of translation is shown in the figure
initiation
which stage of transLation is shown in the figure
initiation
a gene mutation
is described by all of these
Before messenger RNA is mature
a cap and a tail are provided
Ricin is
a substance found in castor bean seeds & a protein that inactivates ribosomes
Frameshift mutations may involve
addition or deletion of one or more base pairs
which of the following statements is true
all of these are true
during the termination stage
all of these occur
four of the five answers listed below are components of a nucleotide select the EXCEPTION
amino acid
a polysome is
an mRNA molecule with several ribosomes attached
the relationship between strands of RNA & DNA is
complementary
ribosomal subunits
coverage only when mRNA is to be translated
All the different kinds of RNA are transcribed in the
nucleus
DNA & RNA are alike in their
none of these
which of the following carries amino acids to the ribosomes
tRNA
if the 4th base from the left (C) in RNA were deleted, what would the new 4th codon be
AGG
which event occurs during the elongation stage
Peptide bonds form, and anticodons bind to complementary codons.
the helix structure on the right of the figure represents
RNA
which of the following dominates in the process of transcription
RNA polymerase
If the DNA triplets were ATG-CGT, the mRNA codons are
UACGCA
what amino acid is carried by the 2nd anti-codon in the figure
histine
Ricin is toxic because it
inactivates ribosomes
in this depiction of transCription, the ____ strand is_____ because it ______.
lower; RNA; is single-stranded
When a gene transcription occurs, which of the following is produced?
messenger RNA
___ molecules carry protein-assembly instructions from the nucleus to the cytoplasm
messenger RNA
the 1st amino acid of a new polypeptide chain is
methionine
the sequence of amino acids specified by the mRNA codons AUGCGUCCA is
methionine-arginine-proline
the structure in the figure depicts which of the following
multiple ribosomes on a strand of mRNA
transcription starts at a region of DNA called a(n)
promoter
the form of RNA that carries the code from DNA to the site of protein assembly is called
transfer RNA
if the DNA nucleotides read ATGCGTGAC, the amino acid sequence of the resulting polypeptide would be
tyrosine-alanine-leucine
