Answer:
B. Cells
Explanation:
The plasma membrane is one of the essential structural and functional components of all the cells. It maintains the cell's interior and regulates the entry and exit of substances into and out of the cells. Both prokaryotic and eukaryotic cells have a plasma membrane.
Plasma membrane forms the outer most covering of an animal cell. Plant cells and bacterial cells have a cell wall outside the plasma membrane. Irrespective of the cell type, the plasma membrane is made up of a bilayer of phospholipids with a hydrophobic core. Several proteins are embedded in the lipid bilayer.
Answer: B, C and D
Explanation:
Option A is wrong because protons are not pumped into the matrix of the mitochondria, but rather protons are pumped from the mitochondrial matrix to the inner membrane space.
Option B is correct. The NADH dehydrogenase, cytochrome b-c1, and cytochrome oxidase complexes are all protons pumps and pump protons across the membrane.
Option C. Is correct. The pH inside the mitochondrial matrix is higher than in the innner membrane space.
Option D is correct. The mitochondria use the proton gradient to synthesize ATP by the enzyme ATP synthase.
Answer:
Hormones are the body's chemical messengers. They carry information and instructions from one set of cells to another. The endocrine system influences almost every cell, organ, and function in the body.
On the average, about 25% of a teenager's total daily energy intake comes from snacks, this number is quite high, since the intake of other foods, such as proteins, vitamins and micronutrients are affected, unbalancing growth and developing diseases in young people.
