Antiparallel strands of a DNA molecule means that
- One strand turns anti-clockwise
- The phosphate groups of two DNA strands at their ends, share the-same position
- The phosphate groups at the start of two DNA strands are in opposite position (pole)
- One strand turns clockwise
The Correct Option is C
Solution and Explanation
The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).
Watson and Crick (1953) showed that structure of DNA is a double helical containing two polynucleotide chains connected by hydrogen bonds and running antiparallel. Antiparallel means that the two strands of a DNA molecule run in opposite directions, parallel to one another. One strand is in the direction of 5' to 3' and another is in 3' to 5'. The main purpose behind the antiparallel direction of the two strands is to provide stability to the DNA.
Top Questions on the molecular basis of inheritance
- In a DNA molecule, if the percentage of adenine (A) is 30\%, what is the percentage of cytosine (C)?
- MHT CET - 2025
- Biology
- the molecular basis of inheritance
- Who proved transforming principle?
- MHT CET - 2025
- Biology
- the molecular basis of inheritance
- Nucleosome is associated with ______ molecules of histones.
- CUET (UG) - 2024
- Biology
- the molecular basis of inheritance
- Which of the following statements is correct regarding the number of codons and their degeneracy?
- MHT CET - 2024
- Biology
- the molecular basis of inheritance
- Which of the following factors ensures that coding for the same amino acid, such as methionine and valine, using identical anticodons remains non-ambiguous?
- MHT CET - 2024
- Biology
- the molecular basis of inheritance
Questions Asked in NEET exam
The current passing through the battery in the given circuit, is:
- NEET (UG) - 2025
- Current electricity
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
- NEET (UG) - 2025
- Pendulums
- Two cities X and Y are connected by a regular bus service with a bus leaving in either direction every T min. A girl is driving scooty with a speed of 60 km/h in the direction X to Y. She notices that a bus goes past her every 30 minutes in the direction of her motion, and every 10 minutes in the opposite direction. Choose the correct option for the period T of the bus service and the speed (assumed constant) of the buses.
- NEET (UG) - 2025
- Relative Velocity
- The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at \(22.5^\circ\) from the polarization axis of one of the polaroids (\(I_0\) is the intensity of polarised light after passing through the first polaroid):
- NEET (UG) - 2025
- Polarization
A full wave rectifier circuit with diodes (\(D_1\)) and (\(D_2\)) is shown in the figure. If input supply voltage \(V_{in} = 220 \sin(100 \pi t)\) volt, then at \(t = 15\) msec:
- NEET (UG) - 2025
- Semiconductor Diode
Concepts Used:
The Molecular Basis of Inheritance
DNA Replication:
DNA synthesis is commenced at particular points within the DNA strand referred to as ‘origins’, which are certain coding regions. There are numerous origin sites, and when replication of DNA starts, these sites are mentioned as replication forks. Within the replication, the complex is the enzyme DNA Helicase, so that they can be utilized as a template for replication. DNA Primase is another enzyme that's essential in DNA replication.
RNA:
Ribonucleic acid (RNA) is an essential biological macromolecule that exists all together in biological cells. It is principally involved in the synthesis of proteins, that carry the messenger instructions from DNA, which itself contains the genetic instructions needed for the event and maintenance of life. In some viruses, RNA, in spite of DNA, carries genetic information.
Genetic Code:
Genetic code is the term we use in the manner that the four bases of DNA--the A, C, G, and Ts--are strung together in a way that the ribosome, the cellular machinery, can read them and switch them into a protein. In the ordering, every three nucleotides during a row count as a triplet and code for one amino alkanoic acid.
Read More: Molecular Basis of Inheritance