Question

15. The term that describes the directionality of the two strands in DNA Is A antidirectional B polydirectional Csemiparallel D. antiparallel E ntisequencial 16. Which of the following enzymes synthesis new DNA during DNA replication? ADNA primase B. RNA polymerase CONA polymerase D Helicase E DNA ligase 17. Which of the following enzymes generates a covalent bond between Okazaki fragments? A DNA primase B. RNA polymerase C DNA polymerase D Helicase E. DNA ligase strand. 18. During DNA replication Okazaki fragments are found on the A. lagging B. template C. leading D. replication E. double 19. What type of bonds hold together the opposite strands in a DNA molecule? A covalent bonds B. hydrophobic bonds Chydrogen bonds D. hydrophilic bonds E. ionic bonds 20. A promoter is __ A. A specific sequence of bases in RNA that marks the place where proteins synthesis should begin B. A specific sequence of bases in DNA that marks the end of a gene. C. A protein that binds to DNA. D. A specific sequence of bases in DNA that marks the beginning of a gene. E. A specific sequence of bases in RNA that marks the place where protein synthesis should end. 21. The process of copying DNA into RNA is called _ A. transduction B. translation C. transcription D. translocation E transgression

Answer 1

Answer 15: Option (D) is correct

Explanation: As we know that the two strands of DNA runs parallel to each other but in opposite direction so a specific term is used for this type of movement of two strands of DNAthat is Antiparallel.

Answer 16: Option(C) is correct

Explanation: The process of formation of new DNA strand from the previous DNA strand is known as DNA replication. This is also known as Autocatalysis. The basic enzyme needed for this process of DNA replication is DNA polymerase. This enzyme is responsible for adding nucleotide and chain elongation.

Answer 17:Option () is correct

Explanation: Option(E) is correct

Explanation: During the process of DNA replication two type of strands are formed as Continuous strand and discontinuous strand. The discontinuous strand is formed s a result of gap generation in okazaki fragments. so DNA ligase is required to fill this gap by covalent interaction(basically phosphodiester bonding).

Answer:18: Option(A) is correct

Explanation: Okazaki fragments are formed as a result of gap (nick) generation. As we know that during the process of DNA replication two type of strands are formed as

1.Continuous strand (leading strand)

2. Discontinuous strand. (lagging strand)

The discontinuous strand is formed as a result of gap generation in okazaki fragments which is called as lagging strand as it is . short sequences of DNA nucleotides. having gap(nick).

Answer 19: Option(C) is correct

Explanation: The two opposite strands of DNA molecule are hold together by Hydrogen bonds.As we know that  DNA is a double helix structure which consists of a sugar backbone and phosphate molecule.It also contain four different types of nitrogenous bases as A, T, C and G).  Adenine, Thymine, Guanine, Cytosine which is bounded together by hydrogen bond.

A=T

G≡C

Answer 20: Option(D) is correct

Explanation: Promoter is a specific nucleotide sequences which is generally present at the start position of gene and is responsible for the transcription(formation of mRNA from DNA).

Answer 21: Option(C) is correct

Explanation: The process of synthesis of RNA from DNA is known as transcription