🧬 Biochemistry Solved MCQs with Answers

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

1490 solved MCQs

Which of the following is a second messenger?Answer: Both (a) and (b) Which of the following statement is incorrect?Answer: None of these Two key organizing principles for large multicellular organisms areAnswer: Cell specialization and communication between cells Which of the following is a hormone whose action requires a cell surface receptor?Answer: Adrenaline The hormone or ligand can be considered asAnswer: First messenger The major second messengers areAnswer: All of the above The signaling molecules called steroid hormonesAnswer: Are made in one location of the body but have their effects some distance away Cholesterol is somewhat amphipathic due toAnswer: The single hydroxyl along with the hydrocarbon nature of the remainder of the molecule BacteriorhodopsinAnswer: All of the above In active transport, the membrane structure that functions isAnswer: Integral proteins Cholesterol is essential for normal membrane functions because itAnswer: Keeps membranes fluid. The model that is now known to be correct for the structure of biological membrane isAnswer: Fluid mosaic model In Fluid mosaic model, the biological membrane can be viewed asAnswer: Two dimensional solutions of oriented lipids and globular proteins Membrane lipids areAnswer: Hydrophilic Pinocytosis occurs inAnswer: All eukaryotic cells Exocytosis is the secretion of proteinsAnswer: Out of the cell across the plasma membrane into the extracellular space The membrane proteins that catalyze active transport reactions differ from soluble enzymes asAnswer: The products of the reaction move in a specific direction The movement of molecules across a membrane by passive transport does not requireAnswer: Vibrational energy Peptidoglycan is a complex consisting ofAnswer: Oligo-saccharide and protein The mesosomes may be the sites ofAnswer: DNA replication and specialized enzymatic reactions Which of the following is correct?Answer: All of the above The smooth endoplasmic reticulum (SER) is the site ofAnswer: Phospholipid synthesis Lysozymes are found inAnswer: Animal cells Biological membranes are like water beds becauseAnswer: All of the above The plasma membrane is a selectively permeable barrier due to presence of specific transportAnswer: Proteins Which type of molecule spans the membrane, from its inner to outer surface according to the Fluid mosaic model of cell membranes?Answer: Protein Which of the following is correct?Answer: All of the above In membranes, lipids areAnswer: All of these Which of the following is not found in membranes?Answer: Nucleic acids The HIV virus infects primarilyAnswer: Cells in the immune system