Answer:
The voltage-gated potassium channels associated with an action potential provide an example of what type of membrane transport?
A. Simple diffusion.
B.<u> Facilitated diffusion.
</u>
C. Coupled transport.
D. Active transport.
You are studying the entry of a small molecule into red blood cells. You determine the rate of movement across the membrane under a variety of conditions and make the following observations:
i. The molecules can move across the membrane in either direction.
ii. The molecules always move down their concentration gradient.
iii. No energy source is required for the molecules to move across the membrane.
iv. As the difference in concentration across the membrane increases, the rate of transport reaches a maximum.
The mechanism used to get this molecule across the membrane is most likely:
A. simple diffusion.
<u>B. facilitated diffusion.
</u>
C. active transport.
D. There is not enough information to determine a mechanism.
Carrier proteins - exist in two conformations, altered by high affinity binding of the transported molecule. Moves material in either direction, down concentration gradient (facilitated diffusion). EXAMPLE: GluT1 erythrocyte glucose transporter.
Channel proteins - primarily for ion transport. Form an aqueous pore through the lipid bilayer. May be gated. Moves material in either direction, down concentration gradient (facilitated diffusion). EXAMPLES: Voltage-gated sodium channel, erytrhocyte bicarbonate exchange protein.
This might be helpful... because I don't know anything about facilitated diffusion.
Maintaining internal conditions within an organism, especially when <span>outside conditions change is called homeostasis.
In Latin, the word homo/homeo means <em>the same, </em>and stasis means <em>state/condition. </em>
</span>
Answer:
B. food production
Explanation:
In the example above described, salinity conditions (3%) completely prevented radicle development (0 mm). Salinity conditions may alter plant development by inhibiting the uptake of nitrogen, and by limiting water intake. Moreover, it has been shown that the excessive accumulation of chloride ions in plant cells may have toxic effects on plant growth, causing ionic stress and thus leading to nutrient deficiency.
Answer:
Option c because from what i know they change to have a more specialized type. Hoping this helps!
The fish is the limiting factor because its population <u>determines the survival and availability of the grizzly bears.</u>
A limiting factor is resources(biotic or abiotic) that affects or determine the availabity and growth of an organism or group of an organism within an ecosystem.
The more fish it takes, the more the liver produces urea, and kidney tubules makes use of the urea in it tubules for urine formation in the loop of Henle. The urine formation and loss, leads to intake of water and the sequence continues.
This is an example of a biological limiting factor because the bear predate on the fish for survival and population.
If the population of the fish drops,( <u>the limiting facto</u>r) the bear drinks less water based on above, and therefore <u>disruptions of the ecosystem</u>.
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