ESSENTIAL CELL BIOLOGY- CHAPTER
7 EXAM QUESTIONS AND ANSWERS
Eukaryotic mRNAs - ANSWER-are translated after they are exported from the nucleus.
What increases the stability of eukaryotic mRNAs? - ANSWER-5'-end cap
poly-A tail
In bacteria, most protein-coding genes lack introns. - ANSWER-TRUEEE
Introns are removed by - ANSWER-RNA splicing in the nucleus.
In eukaryotes, which parts of the genes are transcribed into RNA? - ANSWER-Introns
AND Exons
Unlink the coding sequence of an exon, most of the nucleotide sequence of an intron is
unimportant. - ANSWER-TRUE
What structure is responsible for selecting and transporting only properly process
eukaryotic mRNAs into the cytoplasm? - ANSWER-Nuclear pore complex
In eukaryotic mRNA, the poly-A tail promotes degradation of the molecule. - ANSWER-
FALSO
Many eukaryotic mRNA have a longer lifetime than bacterial mRNA. - ANSWER-
VERDAD
The longer the lifetime of mRNA, the more protein can be produced from it. - ANSWER-
VERDAD
Each nucleotide in an mRNA encodes one amino acid in a protein. - ANSWER-FALSO;
codons or 3 nucleotides
Some codons code for more than one amino acid. - ANSWER-FALSO
Codons in mRNAs bind to complementary anticodons in tRNAs. - ANSWER-True
Some codons do not code for amino acids. - ANSWER-True
Several different codons can code for the same amino acid. - ANSWER-True
Amino acids are attached to their tRNA molecules by - ANSWER-aminoacyl-
tRNAsynthetase
7 EXAM QUESTIONS AND ANSWERS
Eukaryotic mRNAs - ANSWER-are translated after they are exported from the nucleus.
What increases the stability of eukaryotic mRNAs? - ANSWER-5'-end cap
poly-A tail
In bacteria, most protein-coding genes lack introns. - ANSWER-TRUEEE
Introns are removed by - ANSWER-RNA splicing in the nucleus.
In eukaryotes, which parts of the genes are transcribed into RNA? - ANSWER-Introns
AND Exons
Unlink the coding sequence of an exon, most of the nucleotide sequence of an intron is
unimportant. - ANSWER-TRUE
What structure is responsible for selecting and transporting only properly process
eukaryotic mRNAs into the cytoplasm? - ANSWER-Nuclear pore complex
In eukaryotic mRNA, the poly-A tail promotes degradation of the molecule. - ANSWER-
FALSO
Many eukaryotic mRNA have a longer lifetime than bacterial mRNA. - ANSWER-
VERDAD
The longer the lifetime of mRNA, the more protein can be produced from it. - ANSWER-
VERDAD
Each nucleotide in an mRNA encodes one amino acid in a protein. - ANSWER-FALSO;
codons or 3 nucleotides
Some codons code for more than one amino acid. - ANSWER-FALSO
Codons in mRNAs bind to complementary anticodons in tRNAs. - ANSWER-True
Some codons do not code for amino acids. - ANSWER-True
Several different codons can code for the same amino acid. - ANSWER-True
Amino acids are attached to their tRNA molecules by - ANSWER-aminoacyl-
tRNAsynthetase
