Only 22 tRNAs are required for mitochondrial protein synthesis. The normal codon–anticodon pairing rules are relaxed in mitochondria, so that many tRNA molecules recognize any one of the four nucleotides in the third (wobble) position, allowing four codons to be recognized by a single tRNA.

TLS Online TPP Program

#Id: 7899

#XL - Q Biochemistry

Only 22 tRNAs are required for mitochondrial protein synthesis. The normal codon–anticodon pairing rules are relaxed in mitochondria, so that many tRNA molecules recognize any one of the four nucleotides in the third (wobble) position, allowing four codons to be recognized by a single tRNA.

TLS Online TPP Program

#Id: 7037

#XL - T Zoology

Darwin’s evolutionary theory - Evolution as such is the simple proposition that the characteristics of organisms change over time. 

Geometric increase 

Limited food & Space

Struggle for existence 

Variation 

Natural selection

Inheritance of useful characters

Speciation 

TLS Online TPP Program

#Id: 7038

#XL - T Zoology

Darwin’s evolutionary theory - Common descent

TLS Online TPP Program

#Id: 7039

#XL - T Zoology

Gradualism is Darwin’s proposition that the differences between even radically different organisms have evolved by small steps through intermediate forms, not by leaps

TLS Online TPP Program

#Id: 7040

#XL - T Zoology

Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.

TLS Online TPP Program

#Id: 7041

#XL - T Zoology

 Natural selection was Darwin’s brilliant hypothesis, independently conceived by Wallace, that accounts for adaptations, features that appear “designed” to fit organisms to their environment.

TLS Online TPP Program

#Id: 7042

#XL - T Zoology