D. Polarity and size.
<span>The size, polarity, and charge of a substance will determine whether or not the substance can cross the cell membrane by diffusion. The cholesterol was an example of a lipid, and is highly soluble in the nonpolar environment of the lipid bilayer. You saw, in the animation above, the cholesterol freely passing into the hydrophobic environment of the membrane. Cholesterol distributes freely in the membrane and then some fraction will dissolve in the aqueous environment of the cytoplasm. Water, on the other hand, while polar, is small enough to cross the membrane at a slow rate. Note that specialized transport proteins in certain cell membranes can provide a channel for the water, greatly increasing its rate of crossing the membrane. The lipid bilayer is much less permeable to the ion, because of its charge and larger size. As a general rule, charged molecules are much less permeable to the lipid bilayer.</span>
Answer:
be part of the cell signaling process
Explanation:
Glycoproteins and glycolipids are proteins and lipids with carbohydrate chain attached to it. They are an important component of the cell membrane with many roles:
- stabilizing membrane structure-because of their ability to bind water molecules via hydrogen bonds
- cell signaling-they are often membrane receptors for the hormones and neurotrasmitters
- cell attachment (adhesion)-for the connection between cells
- cell recognition-they can act as antigens on the cell surface (immune role)
Answer:
1. They can have constant trained medicals around them, which is good because they could have emergencies.
2. They won’t be alone in there houses, but instead have people and life surrounding them.
3. They’ll have people taking care and looking out for them, other than family.
4. They’ll be comfortable, more happy, and more likely to live a happy end to their lives.
Explanation:
The correct answer among the choices provided is option A. Lung capillaries are responsible for exchanging carbon dioxide for oxygen from the air. Blood that comes from the heart gets oxygen from the alveoli. The carbon dioxide in the blood goes into the alveoli at the same time.
Answer:
C
Explanation:
They turn into fossils! Please crown brainliest!
