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20.Chromosomes And DNA eLearn.Punjab
EXERCISE
Q.1 Fill in the blanks.
1. Particular tRNA molecules become attached to specific amino acids through the
action of activating enzymes called________________.
2. _____ _____is the transfer of genetic material from one cell to another and can alter
the genetic make up of the recipient cell.
3. In a bacteria, a subunit of RNA polymerase called____________ recognizes-10
sequence in the promoter and binds RNA polymerase there.
4. A typical human chromosome contain about nucleotides in its DNA.
5. Miescher extracted a white substance from the nuclei of human cells and fish
sperm and called this substance_________ .
Q.2 Write whether the statement is true or false and write the correct statement
if it is false.
1. The strand of DNA that is not transcribed is called the coding strand.
2. TA TAAT sequence called - 35 sequence is part of promoter, where transcription
actually starts.
3. Rosalind Franklin carried out an x-ray diffraction analysis of DNA.
4. The base pairs in DNA helix are planar and stack 34 nm apart as a result of
hydrophobic interactions.
Q.4 Short Questions
1. What are the three major classes of RNA?
2. What is the function of RNA polymerase in transcription?
3. How did Crick and his colleagues determine how many nucleotides are used to
specify each amino acid?
4. What is anticodon?
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