1. which molecule forms the bulk of a cell membrane?
answer: phospholipid
In terms of structure, a cell membrane (or plasma membrane) consists mainly of a phospholipid bilayer (with associated proteins embedded in it).
2. which is the best definition of diffusion?
answer: Diffusion is the bulk movement of particles from a region of higher concentration to a region of lower concentration
3. which substance is commonly found in a cell membrane?
answer: proteins
Proteins are enzymes which help transport things through the membrane.
4. what is the process whereby molecules in vesicles are exported out of a cell?
answer: exocytosis
Actually there are 2 types of bulk transport and these are: exocytosis and endocytosis, and both require the spending of energy (ATP). In exocytosis, resources are excreted out of the cell via secretory vesicles.
5. In a eukaryotic cell, where is most of the DNA located?
answer: inside the nucleus
The nucleus is the main center of our cells. This contains our chromosomes and genetic information essential for the reproduction of life.