« previous next »

Author Question: There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is (Read 762 times)

Yolanda

  • Hero Member
  • *****
  • Posts: 757
on: Jun 25, 2013
There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is best explained by the fact that
A) some tRNAs have anticodons that recognize four or more different codons.
B) the rules for base pairing between the third base of a codon and tRNA are flexible.
C) many codons are never used, so the tRNAs that recognize them are dispensable.
D) the DNA codes for all 61 tRNAs but some are then destroyed.
E) competitive exclusion forces some tRNAs to be destroyed by nucleases.


coco

  • Hero Member
  • *****
  • Posts: 739
Reply #1 on: Jun 27, 2013
It's B. Have a nice day!


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Yolanda

  • Hero Member
  • *****
  • Posts: 757
Reply #2 on: Jul 6, 2013
Thanks :D


« previous next »
 

Did you know?

Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Did you know?

The average adult has about 21 square feet of skin.

Translational regulation of ferritin mRNA by the iron regulatory protein (IRP) Translational regulation of ferritin mRNA by the iron regulatory protein (IRP)
Evolutionary tree derived from amino acid sequence comparisons Evolutionary tree derived from amino acid sequence comparisons
Messenger RNA (mRNA) carries genetic information from the nucleus to the cytoplasm for protein synth Messenger RNA (mRNA) carries genetic information from the nucleus to the cytoplasm for protein synth
The amino acid neurotransmitters. The amino acid neurotransmitters.
The structure of a lipotechoic acid The structure of a lipotechoic acid
Acid–Base Balance Acid–Base Balance
Video: PET Scan Animation

For a complete list of videos, visit our video library