Answer: c
Explanation: Plants and animals need nitrogen to make proteins but they cannot take it in from the air. Because nitrogen is unreactive as a gas, it has to be transformed into a new molecule. When bacteria in the soil takes nitrogen from the air, it becomes nitrates. Finally, it can move through the food chain in this form.
Answer; B
they're bones allow them to lift them up in the sky.
Answer:
Answer: The correct option is C
Explanation:
The glycolytic pathway involves the oxidation of glyceraldehyde 3-phosphate.
Glyceraldehyde 3-Phosphate is oxidized by NAD+ and an inorganic phosphate is incorporated into the product to form an acyl-phosphate, 1,3-bisphosglycerate, which is an energy rich intermediate. NAD+ is reduced by the transfer of an hydride ion to form NADH. Once NADH is formed, its affinity for the enzyme decreases so that the free NAD+ displaces this NADH. The energy released by the oxidation of the substrate is conserved in the terminal phosphoanhydride bond of ATP via the formation of high energy intermediates.
Thus the oxidation/reduction is necessary to produce NADP which is required for ATP synthesis.
Answer:
If a person has a diet high in saturated fats, LDL cholesterol molecules can carry cholesterol from the liver to cells and to the arterial walls whereas HDL cholesterol transports cholesterol from the cells to the liver where it is converted to bile salts which can modulate cardiovascular function.
Explanation:
Cholesterol is a lipid generated in the liver that is used to make hormones and vitamin D, but can also be ingested when eating fats.
Cholesterol can be divided into two types: LDL (low-density lipoprotein) and HDL (high-density lipoprotein).
LDL is commonly known as the "bad cholesterol" and is responsible for the deposit of cholesterol in the walls of arteries, which generates atherosclerosis and can potentially lead to strokes or heart attacks because it occludes the vessels and makes it impossible for the blood to advance.
HDL is also called "good cholesterol" because it takes the cholesterol from the cells to the liver where it'll serve a good cause, instead of blocking the arteries.
To reduce the amount of LDL, it's best to limit the consumption of fatty meats, dairy products and other saturated fats. Foods with a good amount of HDL are those with unsaturated fats, like fish, nuts and seeds.
