physiology chapter 4 assignment

green gear shows __________ reactions

endergonic (products <- reactants)

Reactions that release energy are called __________ reactions.

exergonic

Slightly different forms of an enzyme found in different organs are called _________

isoenzymes

How often can a sucrase molecule be used to hydrolyze sucrose?

many times

Where is sucrase found in the human body?

microvilli of the small intestine

The active site is a binding site for which of the following?

substrates

Which of the following correctly represents the mechanism of enzyme function (S = substrate, P = product, E = enzyme)?

E + S -> E - S -> E - P -> E + P

How does sucrose change the configuration of sucrase?

Sucrose binds to its active site on sucrase, changing the shape of sucrase enzyme.

The function of sucrase is to ________.

break sucrose into glucose and fructose

blue gears show _________ reactions

exergonic (reactants -> product)

T/F: An enzyme can only bind one substrate at a time.

false

T/F: An enzyme speeds up a chemical reaction in the cell, but can only be used once.

false

ATP is able to store and release large amounts of energy because of its ________.

high energy bond to the third phosphate group and its ability to couple to exergonic and endergonic reactions

Consider the following reversible reaction: CO2 + H2O <--> H2CO3. In which direction (right or left) will the reaction proceed if the CO2 concentration in the blood is reduced?

left

Which type of organic compound are enzymes?

proteins

The direction of reversible reactions depends on the __________ concentrations of the reactants and products.

relative