Which of the following describes movement of molecules into a cell though active transport? 1. Hydrocarbons dissolve in the lipid bilayer and travel down a concentration gradient
2. Molecules move through passages in the cell membrane that are created by channel proteins
3. Pockets in the cell membrane form vesicles around extracellular material during endocytosis
4. Vesicles carrying large molecules fuse with the cell membrane during exocytosis

The diagram shows the results when two parents are crossed. the letters represent alleles for a trait that is controlled by three different genes. which best describes this inheritance pattern? multiple allele because a trait is controlled by three different genes polygenic because the offspring have alleles from both parents multiple allele because the offspring have alleles from both parents polygenic because a trait is controlled by three different genes