BIO 101 EXAM 2 NVCC ACTUAL EXAM 100 REAL
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED ANSWERS)
|ALREADY GRADED A+
What is ATP molecule consists of? Why is it unstable? - ANSWER- is composed of ribose (a sugar), adenine (a nitrogenous base), and three phosphate groupsThe triphosphate tail of ATP is the chemical equivalent of a compressed spring
What is a catalyst? - ANSWER- is a chemical agent that speeds up a reaction without being consumed by the reaction
What are the three things required for any reaction to occur? -
ANSWER-
How does an enzyme lowers the activation energy of the substrate? - ANSWER- Enzyme can speed up a reaction by lowering the EA barrier without itself being consumed, also by right orientation of molecules.
Which factors affect enzyme activity? - ANSWER- temperature pH substrate concentration
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How competitive and non competitive inhibitors differ from each other?
- ANSWER- Competitive inhibitors bind to the active site of an enzyme,
competing with the substrate Noncompetitive inhibitors bind to another part of an enzyme, causing the enzyme to change shape and making the active site less effective
What are the examples of inhibitors? - ANSWER- toxins, poisons, pesticides, and antibiotics
What is a feedback inhibition? - ANSWER- the end product of a metabolic pathway shuts down the pathway
What are the laws of thermodynamics? - ANSWER- the energy of the universe is constant, Every energy transfer or transformation increases the entropy (heat) of the universe,
What are the parts of an enzyme? - ANSWER- substrate, active site
What is the difference between oxidation and reduction? - ANSWER- In oxidation, a substance loses electrons, or is oxidized In reduction, a substance gains electrons, or is reduced (the amount of positive charge is reduced)
What is the ultimate source of energy? - ANSWER- sun
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