Free CLEP Biology Exam Practice Questions
- Enzymes catalyze biochemical reactions by
- Lowering the potential energy of the products
- Separating inhibitors from products
- Forming a complex with the products
- Lowering the activation energy of the reaction
- Providing energy to the reaction
- Which of the following is an example of a cofactor?
- Zinc
- Actin
- Cholesterol
- GTP
- Chlorophyll
- Cyanide is a poison that binds to the active site of the enzyme cytochrome c and prevents its activity. Cyanide is a(n):
- Prosthetic group
- Cofactor
- Coenzyme
- Inhibitor
- Reverse regulator
- The graph above shows the potential energy of molecules during the process of a chemical reaction. All of the following may be true EXCEPT
- This is an endergonic reaction
- The activation energy in curve 2 is less than the activation energy in curve 1
- The energy of the products is less than the energy of the substrate
- Curve 2 shows the reaction in the presence of an enzyme
- The reaction required ATP
- Which of the following is not a characteristic of enzymes?
- They change shape when they bind their substrates
- They can catalyze reactions in both forward and reverse directions
- Their activity is sensitive to changes in temperature
- They are always active on more than one kind of substrate
- They may have more than one binding site
- In a strenuously exercising muscle, NADH begins to accumulate in high concentration. Which of the following metabolic process will be activated to reduce the concentration of NADH?
- Glycolysis
- The Krebs cycle
- Lactic acid fermentation
- Oxidative phosphorylation
- Acetyl CoA synthesis
- Which of the following statements regarding chemiosmosis in mitochondria is not correct?
- ATP synthase is powered by protons flowing through membrane channels
- Energy from ATP is used to transport protons to the intermembrane space
- Energy from the electron transport chain is used to transport protons to the intermembrane space
- An electrical gradient and a pH gradient both exist across the inner membrane
- The waste product of chemosmosis is water
- In photosynthesis, high-energy electrons move through electron transport chains to produce ATP and NADPH. Which of the following provides the energy to create high energy electrons?
- NADH
- NADP+
- O2
- Water
- Light
- Which of the following kinds of plants is most likely to perform CAM photosynthesis?
- Mosses
- Grasses
- Deciduous trees
- Cacti
- Legumes
- The combination of DNA with histones is called
- A centromere
- Chromatin
- A chromatid
- Nucleoli
- A plasmid
CLEP Biology Exam Answer Key
Last Updated: 07/05/2018
