Question

question 3
both lipids and carbohydrates are important in animal cells because both __.

• provide insulation
• form cell walls
• contain nitrogen
• store energy

question 4
the monomer of proteins is __.

• fatty acids
• nucleotides
• monosaccharides (simple sugars)
• amino acids

Explanation:

Analyze Question 3

This question asks for a shared function of lipids and carbohydrates in animal cells. Let's evaluate the options using our knowledge of Lipid Functions and Carbohydrate Functions:

• "provide insulation": While lipids (fats) provide thermal insulation, carbohydrates do not serve this function.
• "form cell walls": Animal cells do not have cell walls.
• "contain nitrogen": Neither typical lipids nor simple carbohydrates contain nitrogen (they are composed of carbon, hydrogen, and oxygen).
• "store energy": Both biomolecules are crucial for energy storage. Carbohydrates (like glycogen) provide short-term energy storage, while lipids (like triglycerides) provide long-term energy storage.

Analyze Question 4

This question asks for the building block of proteins. Let's evaluate the options using our knowledge of Protein Monomers:

• "fatty acids": These are components of lipids.
• "nucleotides": These are the monomers of nucleic acids (DNA and RNA).
• "monosaccharides (simple sugars)": These are the monomers of carbohydrates.
• "amino acids": These are the monomers that link together via peptide bonds to form proteins.

Answer:

Question 3

• provide insulation
• form cell walls
• contain nitrogen
• store energy (Correct answer)

Question 4

• fatty acids
• nucleotides
• monosaccharides (simple sugars)
• amino acids (Correct answer)