Unit 2: Biomolecules Unit Test

Front

Which of the following is a monomer of proteins? Options: Nucleotide, Amino acid, Monosaccharide, Fatty acid

Back

Amino acid

Answer explanation

Amino acids are the building blocks of proteins, making them the correct monomer. Nucleotides are for nucleic acids, monosaccharides for carbohydrates, and fatty acids for lipids.

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DOK Level 1: Recall

Front

What is the primary function of carbohydrates in the body?

Back

Provide energy

Answer explanation

The primary function of carbohydrates in the body is to provide energy. They are broken down into glucose, which is used by cells for fuel, making this the correct choice over the other options.

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DOK Level 1: Recall

Front

Which element is not commonly found in biomolecules?

Back

Helium

Answer explanation

Helium is a noble gas and is not reactive, making it uncommon in biomolecules. In contrast, carbon, hydrogen, and nitrogen are essential elements found in various biomolecules like proteins, nucleic acids, and carbohydrates.

Tags

DOK Level 1: Recall

Front

What is the role of enzymes in biological reactions?

Back

Speed up reactions

Answer explanation

Enzymes are biological catalysts that speed up reactions by lowering the activation energy required for the reaction to occur. They do not act as reactants or provide energy, making 'speed up reactions' the correct choice.

Tags

DOK Level 1: Recall

Front

What is the primary structural form of DNA?

Back

Double helix

Answer explanation

Nucleic acids, such as DNA, are best described as a double helix structure, consisting of two intertwined strands. This unique shape is crucial for their function in storing and transmitting genetic information.

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DOK Level 1: Recall

Front

Which biomolecule is primarily responsible for storing genetic information?

Back

Nucleic acids

Answer explanation

Nucleic acids, such as DNA and RNA, are the biomolecules that store and transmit genetic information. They contain the instructions needed for the development and functioning of living organisms.

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DOK Level 1: Recall

Front

What happens to an enzyme when it is denatured?

Back

It loses its shape

Answer explanation

When an enzyme is denatured, it loses its shape, which is crucial for its function. This change in structure prevents the enzyme from binding to its substrate, thus inhibiting its activity.

Tags

DOK Level 1: Recall

Front

Function of lipids in biological membranes?

Back

Energy storage

Answer explanation

Lipids in biological membranes primarily provide structural support by forming the lipid bilayer, which maintains the integrity and fluidity of the membrane. The other options do not accurately describe lipid functions.

Tags

DOK Level 1: Recall

Front

Identify the monomer of nucleic acids.

Back

Nucleotide

Answer explanation

The monomer of nucleic acids is a nucleotide, which consists of a sugar, a phosphate group, and a nitrogenous base. Amino acids are for proteins, monosaccharides for carbohydrates, and fatty acids for lipids.

Tags

DOK Level 1: Recall

Front

Which element is a key component of proteins?

Back

Nitrogen

Answer explanation

Nitrogen is a key component of proteins, as it is found in amino acids like cysteine and methionine. The other elements listed (phosphorus, calcium, potassium) are not primary components of protein structure.

Tags

DOK Level 1: Recall