mam phys exam 1 questions with 100% correct answers 2024/2025
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Course
Mam phys
Institution
Mam Phys
mam phys exam 1 questions with 100% correct answers 2024/2025
What is the simplest way for a human cell to acquire the activation energy necessary for metabolic reactions? - ANSWERSCouple an exergonic reaction with an endergonic reaction.
An enzyme-catalyzed chemical reaction in which two s...
mam phys exam 1 questions with 100%
correct answers 2024/2025
What is the simplest way for a human cell to acquire the activation energy necessary for metabolic
reactions? - ANSWERSCouple an exergonic reaction with an endergonic reaction.
An enzyme-catalyzed chemical reaction in which two substrates are joined using the energy of ATP is
known as __________. - ANSWERSligation
Why are vitamins important for humans? - ANSWERSMany vitamins are precursors of coenzymes, which
are necessary for metabolic reactions.
Which organic molecule acts as a receptor and carrier for atoms or functional groups that are removed
from substrates during a reaction? - ANSWERSA coenzyme
Enzyme function - ANSWERSlower the activation energy level of a chemical reaction, thus enabling the
reaction to proceed.
In a reaction, a molecule loses an electron. This is an example of which type of reaction? -
ANSWERSOxidation
A kinase moves which functional group or molecule? - ANSWERSPhosphate
An enzyme that transfers chemical groups among substrates is a - ANSWERSTransferase
An allosteric modulator binds to - ANSWERSa region of the enzyme other than the active site.
The active sites of enzymes are - ANSWERSregions of an enzyme that are involved in bringing substrates
together
, When an enzyme is working as fast as it can because its active site is continually refilled with substrate,
the condition is referred to as - ANSWERSSaturation
How does the intracellular fluid compartment differ from the extracellular fluid compartment? -
ANSWERSPotassium ions are more concentrated inside cells than in the extracellular space.
What properties must a molecule have to pass through a cell membrane by simple diffusion? -
ANSWERSThey must be small and/or lipophilic.
Channel proteins that can be opened or closed are called ____ channels. - ANSWERSGated
Membrane receptors are involved in various types of cell signaling. Some membrane receptors function
as _____ channels. - ANSWERSChemically gated
What is a nonpenetrating (NP) solute? - ANSWERSA solute that will not cross the cell membrane.
Water will always move from ________ areas to ________ areas, if there are no impermeable barriers. -
ANSWERShyposmotic, hyperosmotic
Which body fluid compartment contains high levels of K+, large anions, and proteins? -
ANSWERSintracellular fluid only
Facilitated diffusion and active transport differ in that - ANSWERSATP is necessary for active transport,
but not for facilitated diffusion.
Bulk flow is fluid flow as a result of a(n) ________ gradient. - ANSWERSPressure
Fick's law of diffusion states that the rate of diffusion across a membrane is - ANSWERSproportional to
concentration gradient, surface area, and membrane permeability.
What process requires clathrin to form coated pits? - ANSWERSReceptor-mediated endocytosis
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