🧬 Biochemistry Solved MCQs with Answers

Practice 1490 approved 🧬 Biochemistry questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1490 solved MCQs

Who's X-ray work aided Watson and Crick in their discovery of the double helix?Answer: R. Franklin DNA replication in eukaryotes occurs only inAnswer: S phase Which polymerase is active in DNA repairingAnswer: Polymerase II For the DNA replication in eukaryotes, the cell cycle consists ofAnswer: G1,S, G2 and M phases Which of the following in DNA replication and transcription are common?Answer: Synthesis in the 5'-3' direction An important difference between eukaryotic and prokaryotic DNA replication isAnswer: Multiple origins of replication in eukaryotes In DNA, nucleotides are covalently joined together byAnswer: 3', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain What is the name given to the points at which a DNA helix is unwound and new strands develop?Answer: Replication forks The DNA is negatively super coiled, complexes to histone,Answer: All of these During conventional transformation experiments E. coli cells and plasmid DNA interacts in an environment ofAnswer: low temperature and Ca⁺⁺ What is the exact name of the classical Watson-Crick double helix DNA?Answer: B-DNA The site on a bacterial chromosome that marks the initiation point for chromosome replication is calledAnswer: Ori The B-DNA structure found in solution is aAnswer: Right-handed double helix of antiparallel chains (∼10 bp/turn) Which will require a higher temperature to denature?Answer: DNA with a high G-C content In an agarose gel, DNA is moving fromAnswer: Cathode to anode Tₘ refers to the temperature at whichAnswer: All of these DNA segments capable of moving from one place in the genome to another is known asAnswer: Transposons What does ligase do during replication of DNA?Answer: Joins nicks in DNA strands Proteins which help to open the double helix for DNA synthesis areAnswer: DNA helicases First evident that DNA is genetic material comes from the experiment of Griffith isAnswer: Transformation An RNA primer is synthesized byAnswer: Primase The voice box is also called _____?Answer: Larynx Milk contain protein called casein. When milk mixed with acid casein molecule combine to form long chain product called ______?Answer: Milk fibre During muscular contraction, if there is no change in the size of muscle, this contraction is said ______?Answer: Isometric The technique to swim, fastest is _____?Answer: Free style Best procedure to develop flexibility is _______?Answer: Slow stretching and holding Cytosine and uracil are found in ______?Answer: RNA Haemorrhage is caused by the deficiency of ______?Answer: Vitamin-K In which treatment waste water is filtered, disinfected with chlorine and any leftover salt is removed?Answer: Tertiary Kwashiorkor and marasmus are diseases caused by deficiency of which one of the following?Answer: Protein