« previous next »

Author Question: There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is (Read 785 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?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

The 20 common amino acids used to build proteins The 20 common amino acids used to build proteins
Citric Acid Cycle (Kreb's Cycle) Citric Acid Cycle (Kreb's Cycle)
Mass spectrometry (MS) for Mass, Sequence, and Amino Acid Analyses of Purified Proteins Mass spectrometry (MS) for Mass, Sequence, and Amino Acid Analyses of Purified Proteins
Alpha-Linoleic acid Alpha-Linoleic acid
Average Precipitation Acidities and the Effects of Acid Rain Average Precipitation Acidities and the Effects of Acid Rain
Polyadenylation of the 3ˊ end of eukaryotic pre-mRNA Polyadenylation of the 3ˊ end of eukaryotic pre-mRNA
Video: Humerus Adduction Animation

For a complete list of videos, visit our video library