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WorksheetsSCIENCE
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
DURING TRANSCRIPTION, AN mRNA MOLECULE IS FORMED:
a)
complementary to both strands of a DNA
b)
identical to a part of a single strand of DNA
c)
inside the nucleus
d)
in the cytoplasm
2.
DURING TRANSLATION mRNA BONDS WITH:
a)
RIBOSOME
b)
PROTEINS
c)
GLUCOSE
d)
tRNA
3.
WHAT DO YOU CALL THE RNA SEQUENCE THAT CODIFIES ONE AMINO ACID:
a)
nucleotide
b)
tRNA
c)
codon
d)
mRNA
4.
WHAT IS MOST LIKELY TO HAPPEN WHEN THERE IS A CHANGE IN DNA?
a)
The DNA will change code for the incorrect pattern
b)
it will result to a genetic disease
c)
The DNA will be unable to replicate
d)
The organism will be unable to reproduce
5.
On the ribosome, mRNA binds with:
a)
protein
b)
mRNA
c)
small subunit
d)
large subunit
6.
What is the sequence of the mRNA molecule synthesized?
a)
TTUGCTTUG
b)
AACGTAACG
c)
AACGUAACG
d)
TTGCATTGC
7.
The transcribing enzyme is:
a)
DNA polymerase
b)
mRNA
c)
ribosome
d)
glucose
8.
Eukaryotic mRNA binding to the ribosomes is facilitated by
a)
the 7-methyl guanosine cap
b)
tRNA
c)
glucose
d)
ligase
9.
What sequence on the template strand of DNA corresponds to the first amino acid inserted into a protein?
a)
ACG
b)
TAC
c)
TUG
d)
ATC
10.
Each amino acid in a protein is coded for by how many bases in DNA?
a)
9
b)
6
c)
4
d)
3
11.
What mRNA codon would be made from the DNA triplet CGT?
a)
GCA
b)
GCU
c)
ATG
d)
GTA
12.
In a eukaryotic cell, where does transcription take place?
a)
cell membrane
b)
nucleotide
c)
cytoplasm
d)
nucleus
13.
What catalyzes the linkage between ribonucleotides to form RNA during gene expression?
a)
DNA polymerase
b)
RNA polymerase
c)
glucose
d)
ligase
14.
When does the pairing of GAT and CUA occur?
a)
Transcription
b)
Translation
c)
RNA splicing
d)
Replication
15.
What is the function of tRNA in protein synthesis?
a)
deliver amino acids to their proper site
b)
carry the genetic information copied from DNA
c)
associate with a set of proteins to form ribosomes
16.
What bonds hold tRNA molecules ?
a)
RNA polymerase
b)
hydrogen bonds
c)
amino-acyl transferase
d)
ligase
17.
In translation , where are polypeptides synthesized?
a)
ribosomes
b)
cytoplasm
c)
nucleus
18.
What is usually the first amino acid inserted into a new polypeptide chain?
a)
Valine
b)
Methionine
c)
Isoleucine
d)
Phenylalanine
19.
In what stage does the ribosome encounters a stop codon?
a)
translation
b)
transcription
c)
replication
d)
RNA splicing
20.
What are polysomes?
a)
a simple organic compound containing both a carboxyl (—COOH) and an amino (—NH2) group
b)
a linear organic polymer consisting of a large number of amino acid
c)
groups of ribosomes
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