2. The cell membrane is made up of two layers of Phosolipids, which biomolecule makes
up the cell membrane?
O Carbohydrates
O Lipids
O Proteins
O Nucleic Acids

cell membrane is made up of protein And lipid also with some Carbohydrates

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).