Question

1. If the first aa of a tripeptide is Met (AUG) followed by Ile (AUC) and Pro (CCU), the order of codons in the mRNA for the tripeptide should read
   1. AUGAUGILECCUUAG        c. AUGILECCUU                           
   2. AUGILECCUUAG                d. AUGILECCUUAGUAG

2. The first base of the codon is U, the number of codons beginning with U is
   1. 4                      b. 8                           c. 12              d. 16

3.    A codon for Ile is AUC, therefore its anticodon is
   1. GAU               b. CUA                  c. UAG           d. UGA

4.   The folding of tRNA has contributions from the
   1. the TYC and the D arms together
   2. the TYC alone
   3. the TYC, anticodon and D arms
   4. the TYC, aminoacyl, anticodon and D arms

5.   Protein synthesis in bacteria is faster than in animal cells because
   1. transport of mRNA is faster through the smaller bacterial nucleus
   2. there are more ribosomes in bacteria than in the animal cells
   3. there are many nuclei in the bacteria making more mRNA
   4. the mRNA of bacteria goes directly to the ribosome from the polymerase

Answer 1

Question 1

The correct answer is option a - AUGAUGILECCUUAG  

Explanation: First methionine called fmet is removed from most of the proteins. So, to retain methinine in the tripeptide, there should be two methionine at the begining. One will be removed, and the other will be retained. at the last there should be one stop codon , so that protein synthesis stop at that position. So UAG is a stop codon present at the last .

Question 2 - The correct answer is option d-16.

Explanation: There are total 16 codons which begin with U, among them 3 codes for stop codons (UAG, UAA and UGA) and rest 13 codes for different amino acids. ]

UUU and UUC -Phe,

UUA and UUG -leu ,

UCA, UCG,UCU UCC - ser

UGU and UGC- Cys

UGG-trp

UAU and UAC -tyr

Question 3

The correct answer is option c -UAG

Explanation: Codon sequence is AUC, so its complementary sequence is UAG, so anticodon is UAG.

Question 4

The correct answer is option d -the TYC, aminoacyl, anticodon and D arms

Explanation: tRNA is clover leaf like structure which is formed by different stem and lop structure. Four arms are anticodon stem and loop, TYC stem and loop, D arms and loop and aminoacyl stem. All of these structures together form the clover leaf structure of tRNA.

Question 5

The correct answer is option d - the mRNA of bacteria goes directly to the ribosome from the polymerase

Explanation: In bacteria transcription and translation occur simultaneously. So mRNA started translation where it is being transcribed by RNA Polymerase. In eukaryotes transcription occur in the nucleus and after transport of mRNA into the cytoplasm from nucleus, it is translated. But in prokaryotes, both f the process occur simultaneously in the cytoplasm. So rate of translation is much high in bacteria in comparison to eukaryotes.

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