Tag: cell membrane
Questions Related to cell membrane
Beta-oxidation mainly takes place in _________.
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Cytoplasm
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Mitochondria
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Golgi bodies
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None of the above
In biochemistry and metabolism, beta-oxidation is the catabolic process by which fatty acid molecules are broken down in the cytosol in prokaryotes and in the mitochondria in eukaryotes to generate acetyl-CoA, which enters the citric acid cycle, and NADH and FADH2, which are co-enzymes used in the electron transport.
Which among the following is the anabolic process?
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Glucose converts to lactic acid.
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Acetic acid is converted to cholesterol
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Glucose converted to pyruvic acid
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Glycogen converted to glucose
Steroid is derived from
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Cholesterol
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Thyroxine
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Vitamin A
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Fatty acid ester
Misuse of anabolic steroids cause various side-effects in males and females. Which of the following side-effects of anabolic steroids is not observed in females?
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Masculinisation
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Breast enlargement
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Excessive hair growth on face and body
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Deepening of voice
Masculinisation is a side-effect which is not commonly observed in females due to the intake of anabolic steroids. so, 'the correct option is - masculinisation'. "So, the correct answer is 'A' ".
Which of the following is a major substrate for synthesis of fats?
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Acetyl- CoA
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Pyruvate
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Glycogen
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None of the above
Fatty acids are components of the phospholipids that make up the bulk of the lipid bilayers of all cellular membranes. It is synthesized by cytosolic acetyl-CoA through carboxylation by acetyl-CoA carboxylase into malonyl CoA. This conversion occurs primarily in the liver, adipose tissue and lactating mammary glands, where the fatty acids are combined with glycerol to form triglycerides
Stability of the plasma membrane is enhanced by _________ .
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cholesterol molecules
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phospholipids
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glycoproteins
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glycolipids
Cholesterol helps to keep the membrane stable. This stability is maintained as: At high temperatures, cholesterol reduces membrane fluidity by restraining the movement of phospholipids. At low temperatures, cholesterol gives solidification of the membrane because it prevents the close packing of phospholipids.
Heterotrophs can metabolize lipids by a process called ___________ into monomers of _____________ and fatty acids.
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Hydrolysis; Glycerol
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Dehydration synthesis; Glycerol
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Hydrolysis; Glycolipids
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Dehydration synthesis; Glycolipids
Heterotrophs can metabolize lipids by a process of hydrolysis, where water molecule is added to break down a chemical compound (lipids).
Cholesterol content is minimum in
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Fish
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Cow's skimmed milk
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Liver
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Vegetable oils
Cholesterol content is minimum in vegetable oils as plant have ergosterol as the major sterol present in them. Cholesterol is present in animals and 20 % of total cholesterol is sythesised in liver.
Animal membranes contain
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Steroids
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Chlorophyll
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Prostaglandins
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Vitamin A
Saturated fatty acid that reduces oil quality is
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Palmitic acid
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Stearic acid
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Erucic acid
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All the above.
Fatty Acid Composition of Canola Oil The decrease in the level of erucic acid in rapeseed oil resulted in a marked increase in C18 acids, which make up approximately 95% of all fatty acids present in canola oil.