In what state are animal fats at room temperature?
Correct answer C. Solids
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Biology MCQs
Page 51 of Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 51 of 75
What type of bond keeps the helical structure of proteins in place between amino acids?
Correct answer A. H bonds
How is Amphioxus classified?
Correct answer D. All of these
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Which are the simplest organisms that carry out oxygen-producing photosynthesis?
Correct answer A. Cyanobacteria
How many nitrogenous base pairs are there in each turn of the DNA helix?
Correct answer D. 10
How many polypeptide chains make up an insulin molecule?
Correct answer A. 2
How long after the previous meal do hunger pangs usually start?
Correct answer A. 12-24 hours
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