Molecular basis of inheritance

What does DNA have that RNA doesn't

• Presence of thymine

• Presence of deoxyribose

• Presence of ribose

• Both a and b

Which of the following best represents the Central Dogma?

• DNA --> RNA --> proteins

• RNA --> DNA --> proteins

• DNA --> proteins --> RNA

• proteins --> RNA --> DNA

If the total amount of adenine and thymine in a double-stranded DNA is 45%, the amount of guanine in this DNA will be

• 22.5%

• 27.5%

• 45%

• 55%

The following is a section of mRNA:

AUC - CUA - ACC - UAG

What's the anticodon for the third amino acid?

• TGG

• UGG

• ACC

• AUG

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

• UGGTUTCGCAT

• AGGUAUCGCAU

• UCCAUAGCGUA

• ACCUAUGCGAU

Tags

NGSS.HS-LS1-1

Under which of the following conditions there will be no change in the reading frame of the following mRNA?

5' AACAGCGGUGCUAUU 3'

• Insertion of G at 5th position

• Deletion of G from 5th position

• Insertion of A and G at 4th and 5th position respectively

• Deletion of GGU from 7th 8th and 9th positions

Name the enzyme that facilitates opening of DNA helix during transcription.

• DNA helicase

• DNA polymerase

• RNA polymerase

• DNA ligase

Choose the correct pair from the following

• Polymerases - Break the DNA into fragments

• Nucleases - Separate the two strands of DNA

• Exonucleases - Make cuts at specific positions within DNA

• Ligases - Join the two DNA molecules

If the distance between two consecutive base pairs is 0.34nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is  $6.6\times10^9$  base pair , then the length of the DNA is approximately

• 2.2 meters

• 2.5 meters

• 2.7 meters

• 2.0 meters

The first phase of translation is

• Recognition of DNA molecule

• Aminoacylation of tRNA

• Recognition of an anti-codon

• Binding of mRNA to ribosome