Genes that are expressed all the time are dominant ones. They can also be seen all the time if it is a genotype(ie. eye color, hair color, etc.)
Answer:
Answer: I think it's D
Explanation: A mineral is a chemical substance made up of one or more chemicals having a definite crystal structure. Rocks do not have a definite chemical composition whereas minerals do. Sometimes a rock may contain organic remains in it.
Explanation:
Answer:
B cell membranes protect a cell,and cell walls do not
Answer:
Tropomysin, calcium
Explanation:
Tropomysin is a protein that prevents muscle contraction hence acts as a contraction inhibitor. It wraps around the actin blocking the binding sites for myosin on the actin.
Muscle will only contract when they get a rush of calcium ions.
The calcium ions binds to troponin, the troponin changes its shape. The change in shape will remove tropomyosin from the binding sites allowing myosin to bind on the actin leading to muscle contraction.
