How do active transport and facilitated diffusion differ?
a
one uses help from proteins and the other does not
b
one requires energy and the other does not
c
active transport moves molecules against a concentration gradient and facilitated diffusion does not
d
both b & c
d) both b & c
Active transport requires energy to move molecules across a membrane against their concentration gradient, while facilitated diffusion does not require energy and moves molecules along their concentration gradient. Additionally, both processes involve proteins, with active transport relying on transport proteins and facilitated diffusion using carrier or channel proteins.
You work for a company that manufactures food products. A new "wonder food" contains only carbon, oxygen, and hydrogen. At this point, your research can say with certainty that the food ______.
WONDER FOODS SRL - Locuri de munca, Joburi, Angajari, Cariere - eJobs.ro
a
could only be made of triglycerides
b
could only be made of carbohydrates
c
cannot include proteins or nucleic acids
d
includes proteins
You work for a company that manufactures food products. A new "wonder food" contains only carbon, oxygen, and hydrogen. At this point, your research can say with certainty that the food ______.
a
could only be made of triglycerides
b
could only be made of carbohydrates
c
cannot include proteins or nucleic acids
d
includes proteins
D. Both B & C.
Active transport and facilitated diffusion differ in the following ways:
1. Energy requirement: Active transport requires the input of energy, usually in the form of ATP (adenosine triphosphate), to move molecules across the cell membrane. On the other hand, facilitated diffusion does not require energy.
2. Concentration gradient: Active transport moves molecules against their concentration gradient. This means it can move molecules from an area of lower concentration to an area of higher concentration. Facilitated diffusion, however, moves molecules down their concentration gradient – from an area of higher concentration to an area of lower concentration.
In summary, active transport requires energy and can move molecules against their concentration gradient, while facilitated diffusion does not require energy and moves molecules down their concentration gradient. Therefore, the correct option is D.