🧬 Biochemistry Solved MCQs with Answers

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

1490 solved MCQs

Buffer solutionsAnswer: Tend to maintain a relatively constant pH. A Bronsted acid becomes __________ upon losing a proton.Answer: Its conjugate base Most of the important functional groups in biological molecules containAnswer: Oxygen and/or nitrogen and are polar What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?Answer: 1 x 10⁻⁷ Which of the following alcohols would be most soluble in water?Answer: Methanol Which of the following acid/base pairs act as natural buffers in living systems?Answer: All of these If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?Answer: Be repelled by water A compound that is capable of forming hydrogen bonds with waterAnswer: Contains at least some polar covalent bonds A biological polymer contains alanine, tyrosine, and lysine. Which of the following will be true about this molecule?Answer: Protein The effectiveness or capacity of a buffer solution can be affected byAnswer: Both (a) and (b) Who discovered and described the blood groups (ABO) classification?Answer: Karl Landsteiner H₂O and CH₄ are both examples ofAnswer: Molecules Hydrogen bonds and hydrophilic interactions are types ofAnswer: Weak chemical bonds that link together separate molecules A solution with pH = 5 is __________ than a solution with pH = 7.Answer: 100 times more acidic The lone pair electrons on oxygen in a H20 moleculeAnswer: Carry a partial negative charge Which of the following statements about water is correct?Answer: All of these The strength of an acid depends onAnswer: Electronegativity Which of the following statements about covalently bonded molecules is false?Answer: Such molecules often result from the interaction of ionized atoms Which of the following character does not apply to water?Answer: The water molecule readily forms hydrophobic interactions The dissociation constant of H2O at 25° C isAnswer: 10⁻¹⁴ M Weak acids generally have pKₐAnswer: pKₐ values greater than 2 The reason that fats contain more energy than simple sugars, is fats have many moreAnswer: Covalent bonds The main difference between an acid and a base is thatAnswer: Acids donate hydrogen ions in water while bases accept hydrogen ions Which of the following will easily dissolve in a polar solvent?Answer: Sodium chloride The elements oxygen, nitrogen, and carbonAnswer: All of these Urine is produced in ____?Answer: Kidney Which symptom is caused by a deficiency of Vitamin D?Answer: Bones breaking easily Patients suffering from Von Gierke's disease are unable to perform gluconeogeneis because they have a defectiveAnswer: Glucose 6 phosphatase The multistep pathways of metabolism are efficient because theyAnswer: Locate all of the enzymes for a pathway in the same place within the cell Metabolic reactions that break down complex molecules into smaller compounds, thereby releasing usable energy for the cell, are best described asAnswer: Catabolic