CUET PG Zoology 2023 Previous Year Question Papers Shift-1 PDF with Solutions Archives - Page 3 of 8 - CSIR NET LIFE SCIENCE COACHING | NTA NET LIFE SCIENCE

$Based on the context given below, answer the following questions: DNA in eukaryotes is a double-helical structure with two anti-parallel strands intertwined equidistantly. The double-helical structure was deciphered by James Watson and Francis Crick on the basis of X-ray diffraction studies. The hydrophilic backbones of alternating sugar and phosphate groups are on the outside of the helix held together by phosphodiester bonds. The purine and pyrimidine bases of both the strands are stacked inside the double helix. Adenine binds with thymine with hydrogen bond and cytosine binds with guanine with hydrogen bond. The DNA is transcribed into messenger RNA, ribosomal RNA and transfer RNA. Messenger RNA is translated into protein in the cytoplasm. Q75.In a 1300 (base-pair) DNA, if number of adenine residues are 800, what is the number of Watson–Crick hydrogen bonds between cytosine and guanine residues? 500 1000 1500 3000$

Unlocking DNA Hydrogen Bonds

$Based on the context given below, answer the following questions: DNA in eukaryotes is a double-helical structure with two anti-parallel strands intertwined equidistantly. The double-helical structure was deciphered by James Watson and Francis Crick on the basis of X-ray diffraction studies. The hydrophilic backbones of alternating sugar and phosphate groups are on the outside of the helix held together by phosphodiester bonds. The purine and pyrimidine bases of both the strands are stacked inside the double helix. Adenine binds with thymine with hydrogen bond and cytosine binds with guanine with hydrogen bond. The DNA is transcribed into messenger RNA, ribosomal RNA and transfer RNA. Messenger RNA is translated into protein in the cytoplasm. Q74.Consider a DNA segment : 5′ – GTAACCTACCG – 3′ 3′ – CATTGGATGGC – 5′ If the RNA polymerase transcribes the segment from left to right, the mRNA sequence would be 1. 5′ – CAUUGGAUGGC – 3′ 2. 5′ – GUAACCUACCG – 3′ 3. 5′ – CGGUAGGUUAC – 3′ 4. 5′ – GCCAUCCAAUG – 3′$

DNA Segment Transcription to mRNA

$Based on the context given below, answer the following questions: DNA in eukaryotes is a double-helical structure with two anti-parallel strands intertwined equidistantly. The double-helical structure was deciphered by James Watson and Francis Crick on the basis of X-ray diffraction studies. The hydrophilic backbones of alternating sugar and phosphate groups are on the outside of the helix held together by phosphodiester bonds. The purine and pyrimidine bases of both the strands are stacked inside the double helix. Adenine binds with thymine with hydrogen bond and cytosine binds with guanine with hydrogen bond. The DNA is transcribed into messenger RNA, ribosomal RNA and transfer RNA. Messenger RNA is translated into protein in the cytoplasm. Q73.X-ray diffraction experiment to analyze the structure of DNA was performed by James Watson and Francis Crick Rosalind Franklin and Maurice Wilkins Tom Cech and Sidney Altman Martha Chase and Alfred Hershey$

X-ray Diffraction DNA Structure

Why Glycine is Highly Conserved Amino Acid

$Based on the context given below, answer the following questions: Glycine is most often used as a buffering agent in biochemical experiments. This diprotic amino acid has a pKa value of 2.4 owing to carboxyl group and 9.6 owing to amino group. Glycine can exist as a zwitterion which can exist in either protonated form (NH₃⁺) or as a free base (–NH₂) because of the reversible reaction: NH₃⁺ – CH₂ – COOH ⇌ NH₃⁺ – CH₂ – COO⁻ ⇌ NH₂ – CH₂ – COO⁻ Q71.In 0.1 M solution of glycine at pH 9.0, what fraction of glycine has its amino group in –NH₃⁺ form? 4/5 1/5 4/6 5/6$