Tag: molecular biology

Questions Related to molecular biology

The double helix of DNA consists of

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Phosphodiester bonds

  2. Stacking of bases

  3. Base pairing

  4. All of these

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Correct Option: D

In the case of double-stranded DNA, which of the following base ratios are always equal to one?
a. $(A+T)/(G+C)$
b. $(A+G)/(C+T)$
c. $C/G$
d. $(G+T)/(A+C)$.
Select the correct answer.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $1$ and $2$

  2. $1$ and $3$

  3. $2, 3$ and $4$

  4. $1, 3$ and $4$

Show answer
Correct Option: A

In relation to double helical bacterial DNA, match list-I(Parameter) with List-II(Value) and select the correct answer using the codes given the lists.

List-I List-II
a. Diameter of the helix $1$. $34A'$
b. Distance between two adjacent bases $2$. $20A'$
c. Distance between two complete turns $3$. $3A'$
d. Length of the hydrogen bond $4$. $3.4A'$
structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. A-$1$, B-$3$, C-$2$, D-$4$

  2. A-$2$, B-$3$, C-$1$, D-$4$

  3. A-$1$, B-$4$, C-$2$, D-$3$

  4. A-$2$, B-$4$, C-$1$, D-$3$

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Correct Option: A

The number of hydrogen bonds needed to bind cytosine with guanine in a DNA stand is?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. One

  2. Two

  3. Three

  4. Four

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Correct Option: A

In aqueous solution, the alcidine molecules bind to DNA by inserting themselves between adjacent base pairs. The process is called ______________.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Depreciation

  2. Substitution

  3. Mutation

  4. Intercalation

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Correct Option: A

Which of the following pairs is/are correctly matched?
a. E.coli - Circular DNA
b. Tobacco Single - Stranded RNA mosaic virus
c. Reo virus - Double-stranded RNA
Select the correct answer using the codes given.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $1$ alone

  2. $1, 2$ and $3$

  3. $1$ and $3$

  4. $2$ and $3$

Show answer
Correct Option: A

The genetic material in the virus $fX _{174}$ is?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Single-stranded RNA

  2. Double-stranded RNA

  3. Single-stranded DNA

  4. Double-stranded DNA

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Correct Option: A

If the sequence of bases in coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. TAAGCTAC

  2. UAAGCUAC

  3. ATTCGATG

  4. AUUCGAUG

Show answer
Correct Option: D
Explanation:

mRNA strand is complementary to template strand of DNA, while coding strand has same sequence as RNA (except thymine at the place of uracil). Hence, the sequence of bases in mRNA will be AUUCGAUG.

If one strand of DNA has the base sequence AAGCAA, the complementary strand has which of the following sequences?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. UUCGUU

  2. TTCGTT

  3. AAGCM

  4. UTCGTU

Show answer
Correct Option: B
Explanation:

The DNA (Deoxyribonucleic acid) molecules have four nucleotide bases along with sugar and phosphate backbone, these four bases are adenine, guanine, thymine, and cytosine. Adenine and thymine are bonded together by two hydrogen bonds while guanine and cytosine are bonded by three hydrogen bonds.

So, the correct option is 'TTCGTT'.

Which of the following is the byproduct of anaerobic respiration in muscles?

biology molecular biology fermentation cell respiration living organisms and energy production

  1. Sugar

  2. Lactic acid 

  3. HCl

  4. Oxygen

Show answer
Correct Option: B
Explanation:
Anaerobic respiration is the breakdown of glucose in the absence of oxygen. In humans, oxygen-starved muscle cells will respire anaerobically under stress such as heavy physical activity. The by-product of anaerobic respiration in muscles is the lactic acid which causes the puffed out feeling. There is a build-up of lactic acid in the muscles during vigorous exercise. The lactic acid needs to be oxidised to carbon dioxide and water later.
So, the correct answer is 'Lactic acid'.