Energy and Metabolism- Week 5 Flashcards
A ribozyme is known to catalyze the splicing of DNA molecules in bacteria. This is an example of ______________________.
anabolic reactions.
intermolecular catalysis.
intramolecular catalysis.
a biochemical pathway.
intermolecular catalysis.
Which of the following is NOT true about enzymes?
They are protein in nature.
They catalyze specific reactions.
They are reusable.
They increase the rate of the forward and reverse reactions at the same rate.
They are protein in nature.
The energy currency of cells is ___________________.
Adenosine monophosphate.
Adenosine diphosphate.
Adenosine triphosphate.
Simple sugar molecules.
Adenosine triphosphate.
We are able to see because photoreceptors convert optical energy of photons to electrical energy of neurons. This observation fulfills the ______________________.
first law of thermodynamics.
second law of thermodynamics.
fourth law of thermodynamics.
third law of thermodynamics.
third law of thermodynamics.
The most convenient way of measuring energy is by measuring ___________________
Heat energy.
Potential energy.
Mechanical energy.
Kinetic energy
Heat Energy
Vitamins serve as _____________ in reactions.
cofactors
enzymes
coenzymes
reactants
coenzymes
The energy in starch exists in what state?
Kinetic energy
Chemical energy
Heat energy
Potential energy
Potential energy
When several subunits of enzymes work together as one unit to catalyze a series of reactions they are described as ___________________.
synchronized complexes.
enzyme-substrate complexes.
multienzyme complexes.
enzyme complexes.
multienzyme complexes.
Bonds in the phosphates of ATP are unstable because ________________________.
they carry negative charges that repel each other.
they have hydrogen bonds that are readily broken and reformed.
of the presence of ribose and adenine.
they have low activation energy.
they carry negative charges that repel each other.
The phenomenon where enzymes cause substrates to adjust their shapes after binding to each other is known as _________________.
activation energy.
lock and key.
enzyme-substrate complex.
induced fit.
induced fit
In redox reactions which molecule has the most energy?
All reactants have similar energy.
The reduced molecule has the most energy.
All products have the similar energy.
The oxidized molecule has the most energy.
The reduced molecule has the most energy.
Characteristics of catalysts include ____________________
lowering the activation energy of reactants.
increasing the amount of products produce.
increasing the energy of reacting molecules.
making endergonic reactions spontaneous.
lowering the activation energy of reactants.
Magnesium is needed for over 300 enzyme-catalyzed reactions for the structural functions of proteins, nucleic acids, and mitochondria. What role does magnesium play in these reactions?
A coenzyme.
An enzyme.
A cofactor.
A reactant.
A cofactor.
