What enzyme is used to “glue” together the ends of cut pieces of DNA? A. DNA pol
ID: 94428 • Letter: W
Question
What enzyme is used to “glue” together the ends of cut pieces of DNA?
A.
DNA polymerase
B.
restriction enzymes
C.
RNA polymerase
D.
protease
E.
DNA ligase
The most important experimental results that suggested to Watson and Crick that DNA was in the form of a helix was
A.
X-ray data from Rosalind Franklin.
B.
Griffith’s results with transformation.
C.
the findings of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C.
D.
understanding DNA replication.
E.
the discovery that DNA is wound around histone proteins.
In recombinant DNA technology, enzymes used to precisely cut DNA are called
A.
DNA polymerases.
B.
DNA ligases.
C.
restriction enzymes.
D.
vectors.
E.
RNA polymerases.
We refer to the DNA code as being redundant or repetitive. This means that
A.
one codon codes for one amino acid.
B.
each triplet codes for a different amino acid.
C.
each triplet codes for one amino acid.
D.
a single triplet may code for more than one amino acid.
E.
some codons code for the same amino acid.
The fact that the two strands composing a DNA molecule are called antiparallel has to do with the orientation of the
A.
bases.
B.
sugar molecules.
C.
sulfide bonds.
D.
hydrogen bonds.
E.
phosphate molecules.
Base pairing
A.
requires hydrogen bonds.
B.
occurs between identical bases.
C.
explains the X-ray results from Rosalind Franklin.
D.
takes place between sugars and phosphates on the two strands in a helix.
E.
occurs between A and C.
When looking at a table depicting the genetic code, the base sequences signify
A.
tRNA.
B.
rRNA.
C.
mRNA.
D.
DNA.
E.
mtDNA.
In DNA, cytosine bonds to guanine. In RNA, cytosine bonds to
A.
adenine.
B.
thymine.
C.
uracil.
D.
cytosine.
E.
guanine.
The anticodon of the tRNA molecule base pairs with
A.
rRNA.
B.
mRNA.
C.
amino acids.
D.
polypeptides.
E.
DNA.
A component of bacteria that are often used in biotechnology are
A.
plasmids.
B.
introns.
C.
exons.
D.
polypeptides.
E.
operons.
What form of RNA carries instructions from the nucleus to the ribosome?
A.
rRNA
B.
tRNA
C.
mRNA
D.
sRNA
E.
bRNA
A.
DNA polymerase
B.
restriction enzymes
C.
RNA polymerase
D.
protease
E.
DNA ligase
Explanation / Answer
Ans1- when strand of DNA cut by the restriction enzyme,the resultant DNA fragments having sticky ends which is joined together by using DNA ligase.
2-Watson and crick proposed a double helix model which was based on x-ray differaction data produced by Maurice Wilkins and Rosalind Franklin in 1953.
3-Restriction enzymes used to cut the DNA strands.
4-each codons codes for one amino acid
5-The two strands of DNA run in antiparallel directions with 5'-3' in one and 3'-5' in the second according to the orientation of phosphate group.
6- The bases in two strands are paired through Hydrogen bond forming base pairs
7-the bases sequence signify mRNA in genetic code.
8-cytosine bonds with guanine in DNA as well as in RNA and Adenine bonds with thymine in DNA and with uracil in RNA.
9- anticodon of tRNA molecule bases pairs with mRNA.
10- plasmids are autonomously replicating circular extra-chromosomal DNA in bacteria often used in biotechnology.
11-mRNA carries the instructions from nucleus to the ribosomes and other parts of cell.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.