67. Plasmids often encode for proteins a. involved in translation b. required fo
ID: 212805 • Letter: 6
Question
67. Plasmids often encode for proteins a. involved in translation b. required for cellular growth. c. that confer resistance to antibiotics d. involved in DNA replication. 68. The codon on the matches with the anticodon on the to direct the addition of the correct amino acid to the growing polypeptide chain a. mRNA tRNA b. tRNA/mRNA c. DNA/mRNA d. tRNA rRNA 69. The structure and function of a protein are determined by its sequence a. nucleotide b. amino acid c. ribonucleotide d. translocation 70. A triplet of bases on an mRNA molecule is known as a(n) a. amino acid. b. anticodon. c. codon d. ribosome-binding sequence 71. hydrogen bonds, while each guanine-cytosine base Each adenine-thymine base pair has pair has hydrogen bond(s) a. two/one b. two / three c. four three d. three / two 72. In DNA replication there are leading and lagging strands, because a. DNA replication is conservative and a completely new DNA molecule must be made b. DNA replication is semiconservative and each strand is copied simultaneously in opposite c. d. directions the strands of DNA are parallel and are copied in the same direction simultaneously one strand of DNA is copied faster than the other 73. Termination of RNA synthesis is ultimately determined by a. exhaustion of RNA polymerase activity b. special protein factors c. terminases d. specific nucleotide sequences on the template strandExplanation / Answer
67- Plasmids are the extracellular DNA which can replicate inside the host cell when the plasmid is transformed into the cell. The main function of a plasmid is to express the extracellular protein of our interest. The plasmid has the antibiotic resistance which helps us to select the non-transformant cells over the transformant cells. cells which have the plasmid can be able to grow in the presence of the antibiotic.
So correct answer is the option -C
68 - mRNA is the RNA which has the codon which codes for the amino acid.
tRNA carries the amino acids from the cytoplasm to the site of translation. It has one loop called as anticodon loop which has anticodon which pairs with the codon present in the mRNA during translation.
So correct answer is option A.
69 -
Protein is made up of amino acids. Amino acids are joined together by the peptide bonds. This amino joined amino acids makes the primary structure of the protein.
So the answer is option B.
70 - Amino acids are coded by three codons which are present on mRNA. Group of these three nucleotides is called as the codon.
So the answer is an option B.
71 - All the given nitrogen bases are present in DNA. Adenine and GUanine are Purines and cytosine and thymine are pyrimidines.
Adenine pairs with the thymine with two H-bonds and Guanine pairs with the cytosome with three H-bonds
So the answer is option B.
72 - DNA replication always carried out in 5' to 3' direction as DNA polymerase add new nucleotides in this direction. Since DNA replication is semi-conservative and both the strands are replicated at the same time in opposite site which leads to the formation of leading and lagging strand.
So the answer is option B.
73 - During the transcriptional termination RNA polymerase recognise some specific nucleotides in the DNA. This recognization leads to the stalling of RNA polymerase. This allows proteins to binds to the nascent RNA and leads to transactional termination.
The first step of termination is the recognition of specific nucleotide present in the template standard.
So the answer is option D.
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