Question

QUESTIONS During replication the protein that keeps the two stands of DNA from popping back together is called Gene Semiconservative SSB Single Stranded Binding Protein ODNA polymerase QUESTION 2 Tachnow molecule of DNA is a double he which is made up of O two new stands of DNA one new strand and one old strand of DNA two old stands of DNA o the new strands of DNA QUESTIONS QUESTION 19 The process of synthesizing RNA from a specific sequence of DNA is called O translation substitution transcription O genes. QUESTION 20 In the protein synthesis lab. the condition called sickle-cell anemia is due to which category of mutation? O base deletion O base sublination base insertion nonsense mutation QUESTION 13 A DNA code of CAC TAT/AAT transcribes to which of the following RNA codes? CUC TUT/UUA OCACTATIAT QUESTION 17 O GUG/AUA UUT The triplet of RNA bases that determines which amino acids will be added to a growing protein is called enzyme O anticodon. O GUG/AUAUUA O codon O mutagen QUESTION 14 QUESTION 18 The molecule that contains the genetic code, from which the code is transcribed and then translated into proteins is the DNA molecule. the messenger RNA molecule the transfer RNA molecule. A sequence of adjoined amino acids is called a(n) O mutagen O polypeptide ODNA the ribosomal RNA molecule O enzyme

Answer 1

1)The enzyme which prevents the recoiling of the separated strands of the DNA are SSB. These prevents the formation of hydrogen bonds between the strands of the DNA.The single strands are unstable as compared to double stranded DNA. SSB prevents the DNA from being degraded by the nucleases. DNA polymerases synthesise the nucleotides after 3'OH is provided from the primases . So the answer is option3)SSB

2)The method of DNA replication is semiconservative ie each daughter DNA molecule has one strand that is old and one is newly synthesised. This semiconservative method of DNA replication was proven by Meselson and Stahl experiment .It is based on complementary base pairing A pairs with T and G with C. The two old strands or conservative model for replication was proved to be wrong. So the answer is Option 2)one new and one old strand

19)The transcription is referred as the process of synthesising the RNA from the DNA and in this the template strand is used and the bases used for transcription are uracil, adenine, guanine and cytosine. The translation is referred to as the synthesis of the protein from the mRNA sequence. The functional segments of the DNA are called as genes. So the right answer is option c)transcription

20)The sickle cell anaemia is caused by point mutation. Substitution mutation in which one nucleotide is changed to other nucleotide. There is change in the codon from GAG to GTG ie from glutamic acid to valine codon resulting in the shape of the RBC to be sickle shaped. It is case of missense mutation. So the right answer is b) base substitution

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