Unit 2 Review

________________ are made from chains of amino acids. They are the building blocks of tissues, such as skin and muscles.

• Carbohydrates

• Proteins

• Metals

• Lipids

Tags

NGSS.HS-LS1-1

Which of the following are examples of nucleic acids?

• Collagen and keratin

• Saturated fats and unsaturated fats

• Glucose and starch

• DNA and RNA

Why do organisms only need a very small amount of any one enzyme?

• Enzymes are only used by the body systems in small amounts

• Your body system performs very few chemical reactions

• Enzymes can be reused and are not used up in chemical reactions

• Your body is constantly generating new enzymes as they are being used up during chemical reactions

Why are enzymes considered reusable?

• Enzymes are constantly renewed by other enzymes

• Enzymes are made of unusually strong materials

• Enzymes are constantly regenerated by respiration

• Enzymes are not changed when they catalyze a chemical reaction

Which of the following best describes a carbohydrate?

• Carbohydrates always consist of a five-carbon sugar, a nitrogenous base, and one or more phosphate groups and are used to store genetic information.

• Carbohydrates are composed of amino acid monomers and are involved in cell signaling, cell transport, immune responses, and the cell cycle.

• Carbohydrates are organic molecules that are insoluble in water and have the ability to store energy for extended periods of time.

• Carbohydrates are organic macromolecules that are made up of carbon, hydrogen, and oxygen atoms and are used for quick energy or as structural molecules.

Lactase is an enzyme that breaks down lactose. Why can't other enzymes in the body break down lactose for individuals with lactose intolerance?

• Other enzymes cannot bind to lactose due to enzyme specificity.

• Other enzymes would decrease the temperature within the cell.

• Other enzymes within the body are destroyed after catalyzing reactions.

• Other enzymes would catalyze the lactose reaction too quickly.

How would an organism's homeostasis be affected if it was not able to produce enzymes?

• Without enzymes, biochemical reactions would cease completely.

• Without enzymes, the temperature inside cells would increase rapidly.

• Without enzymes, ribosomes would break down proteins, rather than build them.

• Without enzymes, chemical reactions would not occur quickly enough to sustain life.

Tags

NGSS.HS-LS1-3

Which element is included in every organic biomolecule?

• Calcium

• Carbon

• Phosphorous

• Nitrogen

Tags

NGSS.HS-LS1-6

Which substances are required to build the monomer of a DNA molecule?

• Ribose, phosphate group, amino group

• Disaccharide, nitrogen base, phosphate group

• Deoxyribose, phosphate group, nitrogen base

• Sugar, amino group, nitrogen base

Sugars are a type of __________. They are produced by plants and release energy when they are broken down into smaller molecules.

• lipid

• protein

• hydrocarbon

• carbohydrate