Answer:
a. The polarity of membrane phospholipids.
Explanation:
Phospholipids are the amphipathic lipids with polar heads and non-polar tails. The non-polar tails of two lipid layers form the core of the membrane while their heads are oriented towards both of the faces of the membrane. The polarity of the phospholipids does not affect the transport of substances. If a membrane has more of the saturated phospholipid tails in its core, the tight packing of the tails makes the membrane less permeable for large and polar substances.
On the other hand, a membrane with a greater proportion of unsaturated hydrocarbon tails in its core is more permeable. Cholesterol is also an amphipathic sterol and moderates the fluidity of membrane and thereby affects its permeability. A more fluid membrane is more permeable than a more solid membrane. Temperature affects the membrane polarity by affecting the membrane fluidity.
Answer: The difference between them are that Biotic things are living things and abiotic is non living. The biotic and abiotic factors help eachother maintain the ecosystem .
Answer:
Dietitians offer advice on eating to help people improve their health and well being.
If you have a health condition your doctor may refer you to a dietitian. The dietitian will work closely with you and your doctor to develop a suitable diet for you.
Explanation:
Dietitians can also change diets to help manage conditions such as diabetes, heart disease, overweight and obesity, cancer, food allergies, and intolerances.
The Option C is correct.
- C) A reaction rate can be increased when the specific enzyme for a biological reaction is present.
By increasing the enzyme concentration, the maximum reaction rate greatly increases.
Conclusions:
The rate of a chemical reaction increases as the substrate concentration increases. Enzymes can greatly speed up the rate of a reaction. However, enzymes become saturated when the substrate concentration is high.
