Larger cells have slower diffusion rates.
This is because the ratio of;
surface area of a cell : volume of a cell
Decreases with size, as volume increases exponentially with respect to surface area.
We might consider that;
Surface area = X²,
<em>Volume = X</em>³
As X increases, X² : X³ decreases.
So large cells have more trouble with diffusion.
Answer:
C (Photosystems)
Explanation:
Photosynthesis occurs in two distinct stages, the Light-dependent stage and light-independent stage. The light dependent stage generally involves capturing the light energy from sun to produce ATP and NADPH. It occurs in the thylakoid membrane of the CHLOROPLAST.
The light-dependent reaction cannot occur without a large complex of protein and pigment molecules (light-absorbing) called PHOTOSYSTEMS. The photosystems are structured to harvest photons of light, which triggers electron donation by Chlorophyll, photolysis of water and subsequently creation of proton pump to yield ATP and reduction of NADP+ to NADPH. Photosystems consist of Photosystem I (P680) and II (P700).
The answer is <u>B: a mutation inhibiting human immunodeficiency virus from entering the host cell</u>
I would say B). Hope this helps!
A memory B cell is kinda of how it sounds it has a memory of what your body has fought before such as a virus and can stimulate a response quicker then the first time you encountered it.
If you lack memory B cells your body doesn't built up the same immune response when you come into contact with the virus again.
"Vaccination would prevent further disease" Incorrect, a vaccine lets you build up memory cells to combat the disease if you lack them you cannot build up a defense.
"Vaccination would not prevent further disease" Correct, a vaccine can be a dead version of a virus or parts of a virus that shows your body what to respond to quickly in the future. If you body cannot make memory b cells it wouldn't help to use a vaccine. Your body wouldn't keep a memory of it being bad.
"You would not produce antibodies" Even if your body does not remember a particular virus it does produce antibodies to combat it just not as quick or efficiantly as something it has come into contact with before and produced memory cells.
"You would over produce histamine" Incorrect, different process for that histamine.