How long after the previous meal do hunger pangs usually start?
Correct answer A. 12-24 hours
Subject / 3,947 questions
Everyday Science MCQs
Page 128 of Everyday Science multiple-choice questions with answers. Tap an option to check yourself.
Page 128 of 198
Which chemical component(s) form a smaller proportion of a eukaryotic cell than of a prokaryotic cell: (i) lipids, (ii) carbohydrates, (iii) proteins, (iv) DNA?
Correct answer B. iv only
What percentage of a cell’s total dry weight is made up of proteins?
Correct answer B. 50%
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Which statement about fats containing unsaturated fatty acids is incorrect?
Correct answer C. They are usually solid at room temperature
Which of these is an example of almost pure cellulose?
Correct answer D. Cotton
Which of these can tolerate the highest external osmotic pressure?
Correct answer C. Fungi
What do starch, cellulose and glycogen yield on complete hydrolysis?
Correct answer B. Glucose
What is a complex substance that yields polyhydroxy aldehyde or ketone units on hydrolysis called?
Correct answer D. Carbohydrate
Which substance is best suited to forming the structural component of biological membranes?
Correct answer B. Hydrophobic fats
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Which of these is found in every living thing?
Correct answer A. DNA or RNA
What is the valency of a carbon atom?
Correct answer D. Tetravalent
Which chemical component contributes most to the total weight of a mammalian cell?
Correct answer B. Water
What are reactions called in which simple substances combine to form complex ones?
Correct answer B. Anabolic reactions
When a phagocytic vacuole fuses with enzyme vesicles from the Golgi apparatus to digest engulfed food, what are the resulting vesicles called?
Correct answer B. Secondary lysosomes
The pancreas produces digestive secretory granules. After passing through the endoplasmic reticulum, from which surface of the Golgi apparatus are these granules pinched off?
Correct answer A. Maturing face
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60S and 40S subunits combine to form which type of ribosome?
Correct answer A. 80S
Which of the following is not a function of the endoplasmic reticulum?
Correct answer B. Synthesis of conjugated molecules
What are the flattened or tubular membranes of the endoplasmic reticulum that separate its contents from the cytoplasm called?
Correct answer C. Cisternae
What material strengthens the cell wall of prokaryotes?
Correct answer A. Peptidoglycan or murein
What is the optimum temperature for enzymes in the human body?
Correct answer A. 37°C