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Home⇒ Medical Science⇒ Biochemistry⇒ Membrane structure and functions
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ Bacteriorhodopsin all of the above [other wrong options] [Discuss in forum] ![]() ![]() absorbs light and pumps protons is an integral membrane protein contains primarily alpha-helical residues |
Q2 ⇒ The movement of molecules across a membrane by passive transport does not require an input of metabolic energy [other wrong options] [Discuss in forum] ![]() ![]() internal energy vibrational energy none of these |
Q3 ⇒ Which of the following is correct? All of the above [other wrong options] [Discuss in forum] ![]() ![]() Membranes form boundaries around the cell and distinct subcellular components Membranes act as selectively permeable barrier Membranes contain varying amount of lipid and protein and some contain small amount of carbohydrates |
Q4 ⇒ In active transport, the membrane structure that functions is integral proteins [other wrong options] [Discuss in forum] ![]() ![]() cholesterol carbohydrates hydrophobic molecules |
Q5 ⇒ Peptidoglycan is a complex consisting of oligo-saccharide and protein [other wrong options] [Discuss in forum] ![]() ![]() polysaccharide and protein mono-saccharide and protein aminoacid and carbohydrate |
Q6 ⇒ Pinocytosis occurs in all eukaryotic cells [other wrong options] [Discuss in forum] ![]() ![]() all prokaryotic cells mitochondria of all cells none of these |
Q7 ⇒ In membranes, lipids are all of these [other wrong options] [Discuss in forum] ![]() ![]() glycerophospholipids sphingolipids sterols |
Q8 ⇒ Biological membranes are like water beds because all of the above [other wrong options] [Discuss in forum] ![]() ![]() they are always moving they (normally) do not leak their contents the membrane is thin compared to the enclosed volume |
Q9 ⇒ In Fluid mosaic model, the biological membrane can be viewed as two dimensional solutions of oriented lipids and globular proteins [other wrong options] [Discuss in forum] ![]() ![]() three dimensional solutions of oriented lipids and globular proteins two dimensional solutions of oriented lipids and carbohydrate three dimensional solutions of oriented lipids and carbohydrate |
Q10 ⇒ The smooth endoplasmic reticulum (SER) is the site of phospholipid synthesis [other wrong options] [Discuss in forum] ![]() ![]() amino acid synthesis carbohydrate synthesis protein synthesis |
Q11 ⇒ Cholesterol is somewhat amphipathic due to the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule [other wrong options] [Discuss in forum] ![]() ![]() the long branched hydrocarbon along with the four hydrocarbon rings the five-methyl groups along with the hydrocarbon chain the three six-membered rings along with the single five-membered ring |
Q12 ⇒ The membrane proteins that catalyze active transport reactions differ from soluble enzymes as the products of the reaction move in a specific direction [other wrong options] [Discuss in forum] ![]() ![]() they are permanently changed during the reaction the substrates of the reaction are all outside the cell they do not enhance the rates of reaction |
Q13 ⇒ Which type of molecule spans the membrane, from its inner to outer surface according to the Fluid mosaic model of cell membranes? Protein [other wrong options] [Discuss in forum] ![]() ![]() Cholesterol Phospholipid Carbohydrate |
Q14 ⇒ The model that is now known to be correct for the structure of biological membrane is Fluid mosaic model [other wrong options] [Discuss in forum] ![]() ![]() Page's model Lac Operon model Lock and Key model |
Q15 ⇒ Which of the following is correct? All of the above [other wrong options] [Discuss in forum] ![]() ![]() Peroxisomes have a single boundary membrane Peroxisomes contain enzymes that degrade fatty acids and amino acids The byproduct of given reactions in (b) is toxic to cells |
Q16 ⇒ Exocytosis is the secretion of proteins out of the cell across the plasma membrane into the extracellular space [other wrong options] [Discuss in forum] ![]() ![]() out of the cell across the plasma membrane into the intracellular space is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane |
Q17 ⇒ The plasma membrane is a selectively permeable barrier due to presence of specific transport proteins [other wrong options] [Discuss in forum] ![]() ![]() amino acids carbohydrates none of these |
Q18 ⇒ Membrane lipids are hydrophilic [other wrong options] [Discuss in forum] ![]() ![]() hydrophobic ampiphillic none of these |
Q19 ⇒ Lysozymes are found in plant cells [other wrong options] [Discuss in forum] ![]() ![]() animal cells microbial cells all of these |
Q20 ⇒ Cholesterol is essential for normal membrane functions because it keeps membranes fluid. [other wrong options] [Discuss in forum] ![]() ![]() plugs up the cardiac arteries of older men cannot be made by higher organisms spans the thickness of the bilayer |
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