Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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

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 $4$. $3.4A'$
  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-$3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

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

  1. Depreciation

  2. Substitution

  3. Mutation

  4. Intercalation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Intercalation is the process where planar molecules slip between adjacent base pairs in the DNA double helix, causing distortion and frameshift mutations during replication. Depreciation, substitution, and mutation are unrelated or broader terms.

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

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.

  1. $1$ alone
  2. $1, 2$ and $3$
  3. $1$ and $3$
  4. $2$ and $3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All three given statements are correct. E. coli contains circular double-stranded DNA, tobacco mosaic virus possesses single-stranded RNA, and reoviruses are known for having a double-stranded RNA genome.

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

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

  1. Single-stranded RNA

  2. Double-stranded RNA

  3. Single-stranded DNA

  4. Double-stranded DNA
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacteriophage fX174 is a classic model organism known for having a single-stranded DNA genome. Most other common viruses feature double-stranded DNA or single/double-stranded RNA.

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

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

  1. TAAGCTAC

  2. UAAGCUAC

  3. ATTCGATG

  4. AUUCGAUG
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. UUCGUU

  2. TTCGTT

  3. AAGCM

  4. UTCGTU
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  1. 8

  2. 16

  3. 32

  4. 64
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

A zygote is a/ an

  1. Implanted fertilized egg

  2. Fertilized egg

  3. Ovulated egg

  4. Blastocyst
Reveal answer Fill a bubble to check yourself
B Correct answer
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.