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1-B
2-C
3-E
4-C
5-B
6-E
7-B

1.b
2.c
3.e
4.c
5.b
6.e
7.b

d ans. are-
   1.b
   2. c
   3. e
   4.c
   5.b
   6.d
   7.b

1: What is added to the 3'-end of many eukaryotic mRNAs after transcription? 
A. introns 
B. a poly A tail 
C. a cap structure, consisting of a modified G nucleotide
D. the trinucleotide 5'-CCA 
E. exons
Ans B

2.Which of the following is NOT a feature of eukaryotic gene expression? 
A. polycistronic mRNAs are very rare 
B. many genes are interrupted by noncoding DNA sequences 
C. RNA synthesis and protein synthesis are coupled as in prokaryotes
D. mRNA is often extensively modified before translation 
E. multiple copies of nuclear genes, and pseudogenes can occur
Ans C

3.Why do pre-mRNAs get smaller during RNA processing?
The primary RNA transcript of the chicken ovalbumin gene is 7700 nucleotides long, but the
mature mRNA that is translated on the ribosome is 1872 nucleotides long. This size
difference occurs primarily as a result of:
A. capping  
B. cleavage of polycistronic mRNA
C. removal of poly A tails  
D. reverse transcription  
E. splicing
Ans E

4.RNAs that catalyze biological reactions, such as self-splicing introns, are known as:  
A. enzymes  
B. spliceosomes  
C. ribozymes  
D. lariats  
E. mature RNAs
Ans C

5.Which statement is NOT true about nucleic acid hybridization?  
A. it depends on complementary base pairing  
B. a polysaccharide can hybridize with a DNA strand  
C. a DNA strand can hybridize with another DNA strand
D. an RNA strand can hybridize with a DNA strand  
E. double strand DNA denatures at high temperature

Ans  B

6.Promoters for eukaryotic mRNA synthesis:  
A. are more complex than prokaryotic promoters  
B. can require binding of multiple transcription factors to form a transcription complex  
C. have specific DNA sequences such as the "TATA" box that are recognized by proteins  
 D. are the stretches of DNA to which RNA polymerase binds to initiate transcription  
E. all of these
Ans D
 
7.The regions of DNA in a eukaryotic gene that encode a polypeptide product are called:  
A. hnRNAs  
B. exons  
C. enhancers  
D. leader sequences
E. tRNAs
Ans B

 I wish my answers are correct can anyone pls update me whether i am correct or not?