______________ is life's primary source of energy.
sunlight
Which of the following is not correct?
a. Energy cannot be created or destroyed
b. Energy cannot change from one form to another
c. Energy tends to disperse spontaneously
b.
If we liken a reaction an an energy hill, then a reaction that _____________ is an uphill run.
a. require energy
b. releases energy
c. runs from reactants to products
d. uses an ezyme and a cofactor
a.
In an energy-requiring reaction, activation energy is a bit like ______________.
a. a burst of speed
b. coasting downhill
c. a bump at the top of the hill
d. putting on the brakes
c.
____________are always changed by participating in a reaction.
a. enzymes
b. cofactors
c. reactants
d. coenzymes
c.
An environmental factor that directly influences enzyme function is _________________.
Answer: temperature
A metabolic pathway __________________.
a. may build or break down molecules
b. generates heat
c. can include an electron transfer chain
d. all of the above.
d.
Which of the following statements is not correct?
a. Some metabolic pathways are cyclic.
b. Glucose can diffuse directly through a lipid bilayer
c. Feedback inhibition controls some metabolic pathways
d. All coenzymes are cofactors
e. Osmosis is a case of diffusion
b.
Ions or molecules tend to diffuse from a region where they are _____________ (more/less) concentrated to another where they are ____________ (more/less) concentrated.
more, less.
____________ cannot diffuse directly across a lipid bilayer.
a. water
b. gases
c. ions
d. all of the above
c.
) If you immerse a human red blood cell in a hypotonic solution, water will ____________.
a. diffuse into the cell
b. diffuse out of the cell
c. show no net movement
d. move in by endocytosis
a.
Fluid pressure against a wall or cell membrane is called _____________.
turgor
A transport protein requires ATP to pump sodium ions across a membrane. This is a case of this type of transport.
active transport.
Vesicles are part of ____________.
a. endocytosis
b. exocytosis
c. phagocytosis
d. a and c
d.
This enters a reaction
reactant
one cell eats another
phagocytosis
the rule that no energy cannot be created or destroyed
first law of thermodynamics
This forms at reactions end.
product
This assists enzymes
cofactor
basis of diffusion.
Concentration graident
no energy required for this transport
Passive transport
Requires energy input for this transport
Active transport
currency in a cell's energy economy
ATP
this goes in circles
Cyclic pathway
A phospate-group transfer
Phosphorylation