1|Page
BCHM 4360 EXAM 3 LATEST 2026-2027 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
In RNase P, the _______________ RNA component alone can
cut RNA, and the protein part enhances the activity and may
determine substrate range - ANSWER-Bacterial
In RNase P, the ____________________ RNA component
cannot cut RNA alone, but is essential for function - ANSWER-
Eukaryotic, archaeal, and mitochondrial
Introns are present in some tRNAs. tRNA splicing is catalyzed by
- ANSWER-Protein factors
Introns are present in some rRNAs. Some rRNA introns can
catalyze their own removal and are therefore ________________
Precursor RNAs therefore act as ribozymes themselves -
ANSWER-Self splicing
,2|Page
The 3' ends of tRNAs have a conserved _____________
sequence - ANSWER-CCA
The tRNA attachment site for the amino acid - ANSWER-CCA
sequence
The CCA at the 3' end of tRNAs is sometimes
________________ by the tRNA gene - ANSWER-Encoded
The CCA at the 3' end of tRNA is most often added later by a -
ANSWER-CCA adding enzyme
Addition of CCA to the 3' end of tRNA is catalyzed by the -
ANSWER-Nucleotide binding pocket
The nucleotide binding pocket that catalyzes the addition of CCA
to the 3' end of the tRNA has ____________ different
conformations, and these control whether a C or A is added -
ANSWER-Three
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More than ________ modifications have been observed in tRNAs,
and they increase the repertoire of shapes, structures, and
stability of tRNA molecules - ANSWER-80
One of the most common rRNA modifications - ANSWER-2'-O-
methylation
One of the most common rRNA modifications - ANSWER-
Pseudouridylation
Many rRNA modifications are found in regions important for
__________________ function - ANSWER-Ribosome
The enzymes that catalyze ribose methylation and the uridine to
pseudouridine transition are similar in all organisms, but the
____________________________ are different - ANSWER-
Recognition mechanisms
, 4|Page
Eukaryotes and archaea use _______________ to guide
enzymes to the correct site - ANSWER-Small nucleolar RNAs
(snoRNAs)
Small nucleolar RNAs (snoRNAs) associate with a complex of
proteins to make an RNP called - ANSWER-snoRNP
Found in the nucleolus
60-300 nucleotides long
Made from the introns of precursor mRNAs - ANSWER-Small
nucleolar RNAs (snoRNAs)
Base pairs with specific regions of target RNAs and directs
enzymes to those positions for ribose
methylation/pseudouridylation - ANSWER-Small nucleolar RNAs
(snoRNAs)
BCHM 4360 EXAM 3 LATEST 2026-2027 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
In RNase P, the _______________ RNA component alone can
cut RNA, and the protein part enhances the activity and may
determine substrate range - ANSWER-Bacterial
In RNase P, the ____________________ RNA component
cannot cut RNA alone, but is essential for function - ANSWER-
Eukaryotic, archaeal, and mitochondrial
Introns are present in some tRNAs. tRNA splicing is catalyzed by
- ANSWER-Protein factors
Introns are present in some rRNAs. Some rRNA introns can
catalyze their own removal and are therefore ________________
Precursor RNAs therefore act as ribozymes themselves -
ANSWER-Self splicing
,2|Page
The 3' ends of tRNAs have a conserved _____________
sequence - ANSWER-CCA
The tRNA attachment site for the amino acid - ANSWER-CCA
sequence
The CCA at the 3' end of tRNAs is sometimes
________________ by the tRNA gene - ANSWER-Encoded
The CCA at the 3' end of tRNA is most often added later by a -
ANSWER-CCA adding enzyme
Addition of CCA to the 3' end of tRNA is catalyzed by the -
ANSWER-Nucleotide binding pocket
The nucleotide binding pocket that catalyzes the addition of CCA
to the 3' end of the tRNA has ____________ different
conformations, and these control whether a C or A is added -
ANSWER-Three
,3|Page
More than ________ modifications have been observed in tRNAs,
and they increase the repertoire of shapes, structures, and
stability of tRNA molecules - ANSWER-80
One of the most common rRNA modifications - ANSWER-2'-O-
methylation
One of the most common rRNA modifications - ANSWER-
Pseudouridylation
Many rRNA modifications are found in regions important for
__________________ function - ANSWER-Ribosome
The enzymes that catalyze ribose methylation and the uridine to
pseudouridine transition are similar in all organisms, but the
____________________________ are different - ANSWER-
Recognition mechanisms
, 4|Page
Eukaryotes and archaea use _______________ to guide
enzymes to the correct site - ANSWER-Small nucleolar RNAs
(snoRNAs)
Small nucleolar RNAs (snoRNAs) associate with a complex of
proteins to make an RNP called - ANSWER-snoRNP
Found in the nucleolus
60-300 nucleotides long
Made from the introns of precursor mRNAs - ANSWER-Small
nucleolar RNAs (snoRNAs)
Base pairs with specific regions of target RNAs and directs
enzymes to those positions for ribose
methylation/pseudouridylation - ANSWER-Small nucleolar RNAs
(snoRNAs)
