The cell membrane is selectively permeable. Which type of membrane protein best illustrates this concept? A. channel
B. marker
C. receptor
D. hormone

marker.

Explanation:

selectively permeable means some materials are allowed in and out of the cell.

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.