Search found 34 matches

by leftventricle
Sun Jan 02, 2011 1:13 pm
Forum: Botany Discussion
Topic: Does anything affect absorption spectrum of chlorophyll?
Replies: 11
Views: 20396

Why are some plants a certain color? Do they only have that 1 accessory pigment? Like red roses with only red pigments?
by leftventricle
Sun Jan 02, 2011 1:10 pm
Forum: Molecular Biology
Topic: POLAR OR NONPOLAR Y OR Y NOT?
Replies: 11
Views: 23310

Lipids are amphiphillic, they have a hydrophilic head (polar) and hydrophobic tail (non-polar).
by leftventricle
Sun Jan 02, 2011 1:07 pm
Forum: Botany Discussion
Topic: Guard cells
Replies: 5
Views: 5707

And also, why does decreased levels of sucrose cause the stomata to close at night?
by leftventricle
Sun Jan 02, 2011 1:03 pm
Forum: Botany Discussion
Topic: Guard cells
Replies: 5
Views: 5707

Speaking of guard cells...I had some questions.

The water that moves in or out of the guard cells when opening or closing has nothing to do with transpiration, am I correct?

Transpiration has to do with the loss of water through the STOMATA of a leaf?
by leftventricle
Sun Jan 02, 2011 9:24 am
Forum: Cell Biology
Topic: Cellular Respiration help
Replies: 4
Views: 7619

Thanks for answering my questions! But since the efficiency is not 100%, where is the heat going inside your cells? And for ETC - the reason that it needs oxygen is because oxygen is required to reduce the electrons from the cofactors (NADH, FADH2) and thus the cofactors can be recycled back to mito...
by leftventricle
Sun Jan 02, 2011 9:15 am
Forum: Botany Discussion
Topic: What are delocalized electrons?
Replies: 5
Views: 6665

Also I was reading the textbook and it said that guard cells are photosynthetic epidermal cells...does that mean there is chloroplasts/chlorophyll found in them too?
by leftventricle
Sun Jan 02, 2011 9:13 am
Forum: Botany Discussion
Topic: What are delocalized electrons?
Replies: 5
Views: 6665

All that orbital stuff is quite confusing. :S Thanks for answering my other questions! I also had a question about transpiration. Why does the plant want to limit water loss? Is it because it needs the water to make glucose (or other sugar in photosynthesis)? Also - if only 85% of water lost is thro...
by leftventricle
Sun Jan 02, 2011 2:22 am
Forum: Off Topic Discussion
Topic: Three Quick and Easy Fat Loss Tips
Replies: 10
Views: 5073

Re:

JackBean wrote:fiber has no value as a food


So it's just necessary for digestion?
by leftventricle
Sat Jan 01, 2011 10:10 pm
Forum: Off Topic Discussion
Topic: Three Quick and Easy Fat Loss Tips
Replies: 10
Views: 5073

Re:

JackBean wrote:I guess because you should cut something. So, will you cut sugars with no additive value or proteins wich provide you with nitrogen?


That does make some sense, however fiber also falls under the carbohydrate umbrella, which this is necessary for a healthy body. I guess it's all about balance.
by leftventricle
Sat Jan 01, 2011 10:08 pm
Forum: Botany Discussion
Topic: What are delocalized electrons?
Replies: 5
Views: 6665

And thirdly if all photosynthetic organisms use chlorophyll a as primary light absorbing pigment, then why is there a need for chlorophyll b?
by leftventricle
Sat Jan 01, 2011 10:07 pm
Forum: Botany Discussion
Topic: What are delocalized electrons?
Replies: 5
Views: 6665

Also the chlorophyll molecule's hydrocarbon tail is used to anchor the molecule in the phospholipid bilayer membrane, but of which cell? Sorry if it sounds like a silly question.
by leftventricle
Sat Jan 01, 2011 9:50 pm
Forum: Botany Discussion
Topic: What are delocalized electrons?
Replies: 5
Views: 6665

What are delocalized electrons?

So in the chlorophyll molecule, inside the phorphyrin ring, well as a part of it - there is the ring of hydrocarbons with alternating single/double bonds, and in the text it says they have delocalized electrons in the bonds which start the photosynthetic process by absorbing light. How do electrons ...