Biochemistry Flashcards
How do the properties of water allow it to move through the vessels in a plant?
Cohesion allows water to be pulled along a pathway.
Adhesion resists the downward pull of gravity while cohesion uses a pulling force.
How do enzymes catalyze a reaction?
Enzymes lower the activation energy needed start a reaction, speeding up the rate of chemical reactions
How does a non competitive inhibitor decrease the rate of an enzyme reaction?
It changes the shape or the enzymes active site
What does it mean if a chemical reaction has a positive ΔG or a negative ΔG?
Positive: ΔG is endothermic and spontaneous
Negative: ΔG is endothermic and isn’t spontaneous
What does the induced fit hypothesis of an enzyme say?
Suggests in the presence of the substrate the active site may change in order to fit the substrates change.
What factors denature enzymes
Changes in pH, temp, and ionic strength
Difference between primary, secondary, and tertiary structure if proteins
Primary is the amino acid sequence. Secondary is the alpha helix. Tertiary is the entire chain either everything.
Difference between hydrophobic and hydrophilic substances?
Hydro repels water, hydrophilic loves water.
What is the mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway?
Feedback inhibiton
What process builds polymers and what breaks them down?
Hydrolysis breaks down polymers
Why does ice float in water
Bc ice is less sense than the water, the hydrogen bonds keep the molecules of ice farther.
