Tag: biology

Questions Related to biology

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 $4$

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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

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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

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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'.

If an organism is a diploid (or 2n) with 16 chromosomes, then how many chromosomes its sperm cells or egg cells will contain?

biology reproduction in animals fertilization in human being fertilization in humans human fertilization

  1. 8

  2. 16

  3. 32

  4. 64

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Correct Option: A
Explanation:

An organism consists of two types of cells in their body, somatic cells and germs cells/ gametes. During the process of meiosis, a diploid number of chromosome is cut down to haploid. This division is an important event since after fertilisation haploid chromosomes from each gamete (male and female) fuse to retain the diploid state in the zygote. Diploid means two sets of chromosome and haploid is one set. Since here the diploid set is 16 thus one set will be half it, i.e, 8. Thus the answer A is correct.

A zygote is a/ an

biology reproduction in animals fertilization in human being fertilization in humans human fertilization

  1. Implanted fertilized egg

  2. Fertilized egg

  3. Ovulated egg

  4. Blastocyst

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Correct Option: B
Explanation:

  • A zygote is formed by the fusion of a male and a female gamete. In this process, the sperm ruptures the cell wall of the ovum and releases the nucleic acid (chromosome). Thereby forming a diploid zygote. This fusion takes place during the process of fertilisation. 
  • Implanted fertilised egg is the mature form of the zygote.
  • Ovulated egg is a unfertilized egg.
  • A blastocyst is also a mature state of a zygote. So, the correct answer is option B.