Question

1. why are lipids important for the survival of animals?

a lipids carry genetic information in the form of rna.
b. lipids store energy and vitamins that animals need.
c. lipids provide animals with quick energy for routine tasks.
d. lipids contain amino acids necessary for protein synthesis.

1. which best explains why the rate of a biochemical reaction decreases at high temperatures?

a the activation energy increases.
b. the shape of the enzyme changes.
c. the enzyme-substrate complex forms.
d. the bonds between substrates are broken.

1. amylase is a biocatalyst that hydrolyzes starch into simple sugar molecules in the pancreas. which best describes amylase?

a lipid
b. protein
c. fatty acid
d. carbohydrate

1. why are enzymes essential to organisms?

a they are catalysts for biochemical reactions in cells.
b. they provide short term and long term energy for the cells.
c. they provide instructions for protein synthesis and determine traits.
d. they create semipermeable barriers in the cell that separates the inside and outside of the cell.

Explanation:

• Question 10: Lipids are known to store energy (as fats) and can also store fat - soluble vitamins (like vitamins A, D, E, and K). Option A is incorrect because nucleic acids (not lipids) carry genetic information. Option C is wrong as carbohydrates (not lipids) provide quick energy. Option D is incorrect since amino acids are part of proteins, not lipids.
• Question 11: Enzymes are proteins. At high temperatures, the shape of the enzyme (protein) changes (denatures). When the enzyme's shape changes, it can no longer bind effectively to the substrate, so the reaction rate decreases. The activation energy is a property of the reaction itself and not directly increased by high temperature in this context. The enzyme - substrate complex forming is a normal part of the reaction mechanism and not the reason for the rate decrease at high temperatures. Breaking bonds between substrates is part of the reaction process but not the cause of the rate decrease at high temperatures.
• Question 12: Amylase is an enzyme. Enzymes are proteins. Lipids are fats, fatty acids are components of lipids, and carbohydrates are sugars and starches.
• Question 13: Enzymes are essential because they act as catalysts for biochemical reactions in cells. They speed up reactions that would otherwise occur too slowly. Option B is incorrect as carbohydrates (short - term) and lipids (long - term) provide energy. Option C is wrong as nucleic acids provide instructions for protein synthesis. Option D is incorrect as phospholipids (a type of lipid) create semi - permeable barriers in the cell.

Answer:

1. B. Lipids store energy and vitamins that animals need.
2. B. The shape of the enzyme changes.
3. B. protein
4. A. They are catalysts for biochemical reactions in cells.