BIO235 Exam Questions With Verified
Answers 2024/2025
what do cell membranes do?
keep the good in, the bad out, and regulate traffic
what does a phospholipid consist of?
hydrophobic tails and hydrophilic heads
what do channel proteins do?
create gates for moving materials across this membrane
what are the types of transportation across membranes?
-passive transport
-active transport
passive transport moves from ____ to ______
High to Low
describes passive transport
-moves down the gradient
-high to low
-no energy needed
active transport moves from ___ to ____
Low to High
describe active transport
-moves up the gradient
-low to high
-requires more energy
what us a negative feedback loop?
counteraction of an effect by its own influence on the process giving rise to it
what us an example pf a negative of a negative feedback loop?
menstrual cycle
What is an example of positive feedback loop?
Pregnancy
Describe a positive feedback loop?
-sometimes does not shut off
-enhancement or amplification of an effect by its own influence on the process giving rise to it
, Describe a negative feedback loop
Counter action of an effect by its own influence on the process giving rise to it
Describe the process of negative feedback loop
Stimulus - sensor - control - effector
What are carbohydrates?
The sugars we need for energy
Monosaccharides are ....
-simple sugars
-1 monomer
Example of a monosaccharide
Glucose
What are disaccharides?
-More complex sugars
-2 monomers
example of disaccharide
Lactose
What is a polysaccharide?
-Consists of the most complex sugars
-3+ monomers
Describe lipids
-a hydrocarbon compound that is hydrophobic
-the basis for fats in the body
What is a triglycerides
-most common dietary lipid group
-commonly referred to directly as "fat" (ex: dairy)
Important roles of protein :
-enzymes
-hormones
-transport
-muscle contraction
-defense
-structure
What are nucleotides?
Highly specialized organic compounds consisting of a phosphate group, a sugar and a nitrogenous
base
Answers 2024/2025
what do cell membranes do?
keep the good in, the bad out, and regulate traffic
what does a phospholipid consist of?
hydrophobic tails and hydrophilic heads
what do channel proteins do?
create gates for moving materials across this membrane
what are the types of transportation across membranes?
-passive transport
-active transport
passive transport moves from ____ to ______
High to Low
describes passive transport
-moves down the gradient
-high to low
-no energy needed
active transport moves from ___ to ____
Low to High
describe active transport
-moves up the gradient
-low to high
-requires more energy
what us a negative feedback loop?
counteraction of an effect by its own influence on the process giving rise to it
what us an example pf a negative of a negative feedback loop?
menstrual cycle
What is an example of positive feedback loop?
Pregnancy
Describe a positive feedback loop?
-sometimes does not shut off
-enhancement or amplification of an effect by its own influence on the process giving rise to it
, Describe a negative feedback loop
Counter action of an effect by its own influence on the process giving rise to it
Describe the process of negative feedback loop
Stimulus - sensor - control - effector
What are carbohydrates?
The sugars we need for energy
Monosaccharides are ....
-simple sugars
-1 monomer
Example of a monosaccharide
Glucose
What are disaccharides?
-More complex sugars
-2 monomers
example of disaccharide
Lactose
What is a polysaccharide?
-Consists of the most complex sugars
-3+ monomers
Describe lipids
-a hydrocarbon compound that is hydrophobic
-the basis for fats in the body
What is a triglycerides
-most common dietary lipid group
-commonly referred to directly as "fat" (ex: dairy)
Important roles of protein :
-enzymes
-hormones
-transport
-muscle contraction
-defense
-structure
What are nucleotides?
Highly specialized organic compounds consisting of a phosphate group, a sugar and a nitrogenous
base
