40) What cell surface specialization is present on this epithelium? A) villi 40) B) pits C) cilia D) microvilli E) flagella

1) All of the following are functions of proteins within a membrane except __________. A)Maintaining the fluidity of membranes B)transport ions and other polar substances C)receptors to bond molecules outside of the cell D)helping the body to recognize its own cells   2)  Which of the following organelles is not part of the endomembrane system A)mitochondria B)golgi apparatus C)lysosomes D)rough endoplasmic reticulum   3) Which cytoskeletal element is composed of actin and is involved with muscle contraction and provided strength to cells during stretching and compression? A)Microfilimants B)Intermediate filaments C)Microtubules D)Flagella

Which of the below statements correctly describes the extracellular matrix? a)A layer that facilitates connections and communications with other cells in a tissue b)A gel like substance that resists compression c)All of the other answers are correct d)a complex mix of proteins and polysaccharides.

The cell membrane   a)  has no function that is known.   b)  is responsible for starting mitosis.   c)  controls what substances enter the cell.   d)  has a thick cuticle around the outside.