IB Biology

Molecular Biology is the study of

• Biological molecules

• Chemical processes in living organisms

• Organic chemistry

• DNA

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Select all that apply. Urea can be produced by:

• Aerobic respiration in living organisms.

• The urea cycle in the liver.

• From carbon dioxide and ammonia in a laboratory.

• Anaerobic respiration in living organisms.

Typically, in carbon compounds, how many bonds does carbon make?

• 3

• 4

• 5

• none of the above

Common types of carbon compounds in living organisms are:

• DNA, enzymes, nitrogenous bases, and amylose.

• Nucleic acids, amino acids, carbohydrates, and lipids.

• Urea, amino acids, nucleic acids, and carbohydrates

• Carbon dioxide, Lipids, carbohydrates, and proteins.

• Nucleic acids, proteins, carbohydrates, and lipids.

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This molecule is a

• Carbohydrate

• Lipid

• Protein

• Nucleic acid

• Cholesterol

What is a -COOH group called?

• Amine group

• Hydroxyl

• Carboxyl

• Methyl

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Which is not true about carbohydrates?

• They contain oxygen and hydrogen in a 1:2 ratio.

• They contain carbon, oxygen, and hydrogen.

• They have hydroxyl groups.

• They have carboxyl groups.

Which statement is true about amino acids?

• All amino acids have amine groups.

• Some amino acids contain phosphorus.

• No amino acid contains sulfur.

Which statement is true about catabolism?

• Catabolism occurs during protein synthesis.

• Catabolic reactions release energy that can be captured in the form of ATP

• An example of a catabolic process is DNA replication.

• Catabolism is the synthesis of complex molecules from simpler molecules through hydrolysis.

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Metabolism is best defined as:

• A chemical reaction.

• The web of all enzyme-catalyzed reactions in a cell or organism.

• The web of all chemical reactions in a cell or organism.

• The web of all endergonic reactions in a cell or organism.

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