12th Grade > Biology
MOLECULAR BASIS OF INHERITANCE MCQs
Total Questions : 56
| Page 3 of 6 pages
Answer: Option A. -> Gregor Mendel, Walter Sutton, T.H. Morgan
:
A
The experiments by Mendel, Sutton and Morgan did not directly involve DNA. However, they did play a major role in paving way for research in genetics in the right direction. The other scientists (mentioned in the options) worked directly with DNA in their respective experiments.
:
A
The experiments by Mendel, Sutton and Morgan did not directly involve DNA. However, they did play a major role in paving way for research in genetics in the right direction. The other scientists (mentioned in the options) worked directly with DNA in their respective experiments.
Answer: Option D. -> All the above
:
D
Humans have had a dubious history of using new knowledge for a negative purpose. Moreover, the human genome is a very personal information. It is almost like knowing another person’s name, bank account number, ATM PIN cards and passwords to e-mail accounts. It is very important to protect the knowledge of human genome with laws that prevent unlawful usage.
:
D
Humans have had a dubious history of using new knowledge for a negative purpose. Moreover, the human genome is a very personal information. It is almost like knowing another person’s name, bank account number, ATM PIN cards and passwords to e-mail accounts. It is very important to protect the knowledge of human genome with laws that prevent unlawful usage.
Answer: Option A. -> Ribonucleic acid
:
A
The given structure shows a few nucleotides bonded together to form a long chain, which indicates that the molecule is a nucleic acid and not an individual nucleotide. The sugar molecule in the given structure is ribose, and hence, the molecule has to be ribonucleic acid. Moreover, there is a molecule of uracil shown as part of this polymer, which too, gives a hint that it is RNA and not DNA.
:
A
The given structure shows a few nucleotides bonded together to form a long chain, which indicates that the molecule is a nucleic acid and not an individual nucleotide. The sugar molecule in the given structure is ribose, and hence, the molecule has to be ribonucleic acid. Moreover, there is a molecule of uracil shown as part of this polymer, which too, gives a hint that it is RNA and not DNA.
Answer: Option A. -> True
:
A
Codon is a set of three nucleotide bases on the mRNA strand, and codes for a specific amino acid. Each tRNA molecule carries a specific amino acid at its amino acid (AA) binding site or amino acid acceptor arm. The loop opposite to it (as seen in the clover leaf structure) is called the anticodon loop, which contains a set of three nucleotide bases complementary to the codon of the respective amino acid.
:
A
Codon is a set of three nucleotide bases on the mRNA strand, and codes for a specific amino acid. Each tRNA molecule carries a specific amino acid at its amino acid (AA) binding site or amino acid acceptor arm. The loop opposite to it (as seen in the clover leaf structure) is called the anticodon loop, which contains a set of three nucleotide bases complementary to the codon of the respective amino acid.
Answer: Option A. -> DNA fingerprinting
:
A
DNA fingerprinting is a technique used in forensic investigations to identify criminals. The DNA of the suspects and the DNA sample collected at the crime scene are compared to check if the criminal is one among those suspects.
:
A
DNA fingerprinting is a technique used in forensic investigations to identify criminals. The DNA of the suspects and the DNA sample collected at the crime scene are compared to check if the criminal is one among those suspects.
Answer: Option B. -> Promoter
:
B
The first step of transcription is called initiation, during which the enzyme RNA polymerase binds on to the promoter region. Many eukaryotic genes have a conserved promoter sequence to begin with, called the TATA box, located 25 to 35 base pairs upstream of the transcription unit. This region always has the sequence TATAAA on one DNA strand, and ATATTT on the complementary strand. RNA polymerase specifically identifies this region on the DNA molecule to initiate transcription.
:
B
The first step of transcription is called initiation, during which the enzyme RNA polymerase binds on to the promoter region. Many eukaryotic genes have a conserved promoter sequence to begin with, called the TATA box, located 25 to 35 base pairs upstream of the transcription unit. This region always has the sequence TATAAA on one DNA strand, and ATATTT on the complementary strand. RNA polymerase specifically identifies this region on the DNA molecule to initiate transcription.
Answer: Option A. -> Introns
:
A
In eukaryotes, the DNA includes introns and exons. Introns are the non-coding regions that are removed from the mRNA during splicing. Only the exons, which actually code for genes, are retained.
:
A
In eukaryotes, the DNA includes introns and exons. Introns are the non-coding regions that are removed from the mRNA during splicing. Only the exons, which actually code for genes, are retained.
Answer: Option A. -> STRs
:
A
STRs or Short Tandem Repeats are certain specific nucleotide sequences in the human genome, which are repeated multiple times. The number of these repeats is unique for each individual. STRs do not code for any protein, and thus, are found in the noncoding parts of DNA. Identification of the number of these STRs is basically the key step in DNA fingerprinting.
:
A
STRs or Short Tandem Repeats are certain specific nucleotide sequences in the human genome, which are repeated multiple times. The number of these repeats is unique for each individual. STRs do not code for any protein, and thus, are found in the noncoding parts of DNA. Identification of the number of these STRs is basically the key step in DNA fingerprinting.
Answer: Option A. -> DNA, mRNA, tRNA and amino acids
:
A
The correct sequence of code transfer during polypeptide formation is DNA → mRNA → tRNA → amino acids. This is known as the central dogma of molecular biology.The information in DNA is carried by messenger RNA to the site where proteins can be made, which is the ribosome. According to the information in the mRNA, tRNA brings in the correct amino acid in the respective sequence, eventually forming the polypeptide.
:
A
The correct sequence of code transfer during polypeptide formation is DNA → mRNA → tRNA → amino acids. This is known as the central dogma of molecular biology.The information in DNA is carried by messenger RNA to the site where proteins can be made, which is the ribosome. According to the information in the mRNA, tRNA brings in the correct amino acid in the respective sequence, eventually forming the polypeptide.
Answer: Option C. -> p-ii, q-i, r-iv, s-iii
:
C
Transcription takes place in three major steps- initiation, elongation and termination. Initiation involves binding of RNA polymerase to the TATA box. This is followed by addition or polymerisation of ribonucleotides according to the template. The last step is termination, during which RNA polymerase detaches from the parental DNA in order to end the transcription process. The newly formed mRNA then undergoes processing, which involves capping and tailing by protective molecules.
:
C
Transcription takes place in three major steps- initiation, elongation and termination. Initiation involves binding of RNA polymerase to the TATA box. This is followed by addition or polymerisation of ribonucleotides according to the template. The last step is termination, during which RNA polymerase detaches from the parental DNA in order to end the transcription process. The newly formed mRNA then undergoes processing, which involves capping and tailing by protective molecules.
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