Biology- Unit 2 Test

Which statement best describes the relationship between activation energy and rate of reaction? Increasing the activation energy can increase the rate of a reaction. Reducing the activation energy can increase the rate of a reaction. Increasing the reaction energy does not alter the rate of reaction. Reducing the activation energy can decrease the rate of a reaction.

Which will increase the rate of a chemical reaction? adding a catalyst decreasing the pressure decreasing the temperature removing a catalyst

Which statement about enzymes is true? An enzyme functions to increase the rate of a chemical reaction. Enzymes are proteins that function as catalysts in nonliving things. Each enzyme can catalyze many different biochemical reactions. Enzymes and substrates fit together like a lock and key.

What would most likely happen to a person who is not getting enough essential amino acids in his or her diet? The body would synthesize the amino acids. Muscle tissue would break down to supply amino acids. Protein synthesis would increase. Protein synthesis would stop.

Which is released during the formation of a peptide bond? a five-carbon sugar an amino group an amino acid a water molecule

Which type of protein will fight disease? insulin antibodies ligaments genes

What would most likely happen if an error occurred when RNA was receiving coding information? Proteins would be formed incorrectly. DNA would form incorrectly. RNA could not form a correct blueprint. The incorrect amino acid would form.

What would most likely happen if a person increased the amount of saturated fat in his or her diet? The person's risk of cardiovascular disease would increase. The person's risk of cardiovascular disease would decrease. The person's bad cholesterol would decrease. The person's good cholesterol would increase.

Why do phospholipids form a bilayer in water? The phosphate portions repel each other. The hydrophilic and hydrophobic parts attract each other. The phosphate portions attract water, and the lipid portions repel water. The lipid portions attract water, and the phosphate portions repel water.

What is the general term for any carbohydrate monomer? glucose polysaccharide monosaccharide fructose

What is a difference between starch and glycogen? Starch stores energy, and glycogen provides structural support. Starch is found in plants, and glycogen is found in animals. Starch is composed of fructose, and glycogen is composed of glucose. Starch is a monomer, and glycogen is a polymer.

Which carbohydrate can be used by the body as an immediate source of energy? glucose cellulose chitin glycogen

After school, Kai feels hungry and tired. He finds some sugar cookies in the cabinet and finishes the whole package. Which statements best describe the role of glucagon and insulin in this scenario? Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. Insulin was secreted after he ate the cookies because his blood glucose was high. Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. Glucagon was secreted after he ate the cookies because his blood glucose was high. Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, insulin from the cookies increased his blood sugar levels. Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, glucagon from the cookies increased his blood sugar levels.

A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas. Which group of statements best describe all of the materials he is using in the investigation? They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter. They are each made of matter. Some are compounds and some are elements. They all contain atoms. They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms. They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.

Which type of molecule that can be found in living things lacks carbon atoms? protein carbohydrate fat water

A scientist is examining the role of an element found in fats and carbohydrates of living things. This element makes up 65% of human body mass. Which statement describes the element he is studying? He is studying oxygen, which can also be found in proteins. He is studying oxygen, which is the most abundant element in the atmosphere. He is studying nitrogen, which can also be found in proteins. He is studying nitrogen, which is the most abundant element in the atmosphere.

Which element is found in both DNA and protein? sulfur sodium nitrogen chlorine

Responding to the environment is a characteristic of life best shown by which example? a human shivers on a cold day a horse trots in a field a dog swims in a pond a cat licks its paws

Organisms may contain up to five levels of organization within their bodies. Which level of organization is best represented by the liver? tissue organ organism organ system

The heart is an example of which level of organization within an organism? cell organ tissue organ system