Search found 43 matches

by MIA6
Mon Jan 08, 2007 2:58 am
Forum: Physiology
Topic: Transport
Replies: 1
Views: 3052

Transport

1. What's the colors of deoxygenated blood and oxygenated blood? My teacher always uses blue to represent deoxygenated blood and uses red to represent oxygenated blood. I don't know why? 2. The pulse is a wave of alternate stretchings and contracations of artery walls that proceeds from the aorta al...
by MIA6
Sun Jan 07, 2007 5:11 pm
Forum: Cell Biology
Topic: cell membrane
Replies: 10
Views: 24297

Hi, asutoshsahu. But as you can see the picture you posted, the two surfaces are phospholipid.!! the protein just travels around. THey just appear like a point, not the whole surface.
by MIA6
Sun Jan 07, 2007 3:08 am
Forum: Cell Biology
Topic: cell membrane
Replies: 10
Views: 24297

cell membrane

On my book, it says Cell membrane consists of two layers of lipid molecules. Protein molecules are embedded in this lipid bilayer. My question is: What is on the inner memberane surface and outer membrane surface. i think lipid molecules are on the both surfaces because of the first sentence i wrote...
by MIA6
Sun Dec 31, 2006 12:09 am
Forum: General Discussion
Topic: community
Replies: 1
Views: 1311

community

What's the difference between 'community' and 'ecosystem'?
Does 'community' must have an environment? Does it refer to only living organisms or both? I think ecosystem refers to both living and nonliving organisms, right? I feel they are so confusing. Hope you can help me.
by MIA6
Sat Dec 30, 2006 2:55 pm
Forum: Human Biology
Topic: heart
Replies: 5
Views: 3851

heart

1. The pulse is a wave of alternate stretchings and contractions of artery walls that proceeds from the aorta along all arteries and arterioles. The stretching does not represent the advancing front of a wall of blood. I don't understand the last sentence, 'advancing front'? 2. What is 'fetal' (?) h...
by MIA6
Sat Dec 30, 2006 2:54 pm
Forum: Cell Biology
Topic: epithelial cells
Replies: 1
Views: 1479

epithelial cells

What is epithelial cells? Capillaries wall is made of single epithelial cells. It means it is made of single LAYER of epithelial cells? Is that epithlium the same as epithelial cells?
Thanks for replies.
by MIA6
Thu Dec 07, 2006 6:05 am
Forum: General Discussion
Topic: Respiration
Replies: 1
Views: 1378

Respiration

1. On my book, it says 'The reactions of anaerobic respiration occurs within the general cytoplasm.' But my teacher told us that the respiration occurs in the mitochondria. So i want to know which one is right. 2. The thin, moist walls of the alveoli are composed of a single layer of cells. What doe...
by MIA6
Sat Nov 11, 2006 8:39 pm
Forum: Cell Biology
Topic: Centrioles
Replies: 4
Views: 5176

Centrioles

1. Centrioles are normally present in the: (1) cytoplasm of onion cells (2) cytoplasm of cheek cells (3) nuclei of liver cells (4) nuclei of bean cells. I think the answer should be (2), since the definition of 'centrioles' is most animal cells have tiny structures in the cytoplasm called centrioles...
by MIA6
Sat Nov 11, 2006 8:38 pm
Forum: Physiology
Topic: A question
Replies: 6
Views: 7270

A question

Which statement beest describes an activiry that will contribute to the maintenance of homeostasis in an organism? (1) A desert rattlesnake enters an underground burrow on a hot summer day (2) Roots of a willow tree grow away from a moisture-rich region of the soil. (3) A polor bear sheds must of it...
by MIA6
Wed Nov 01, 2006 4:33 am
Forum: Molecular Biology
Topic: Acids
Replies: 1
Views: 1430

Acids

1. What's the difference between 'organic acids' and 'fatty acids'? What's the molecular formula for the fatty acids?
2. What is enzymes' work?

Thanks for replies!
by MIA6
Wed Nov 01, 2006 12:06 am
Forum: Cell Biology
Topic: Basic questions about cells..
Replies: 2
Views: 3031

Basic questions about cells..

1. Do 'Cells' include living cells and dead cells??? but what does it mean by living and dead? I read my book, it says virus sometimes are thought to be living cells since virus particles can reproduce. So what's the meaning of living cells? Are they just simply cells or....? 1. I think 'protoplasm'...
by MIA6
Tue Oct 31, 2006 4:30 am
Forum: General Discussion
Topic: cells
Replies: 6
Views: 4694

cells

1. Can anyone tell me what is the difference between 'organelles' and 'protoplasm'? I feel they are very similar. 2. What's the difference of the functions of the 'cell wall' and 'cell membrane'? I think they are both controlling the transport throughout the cells? 3. Is the 'living cell' same as 'c...