unit 1 chpt 3.docx - Unit 1 Homework 3 Cell Structure and Function Name Davis Sharneice U1HW3 Remember to rename the file when you download it 1 What is

unit 1 chpt 3.docx - Unit 1 Homework 3 Cell Structure and...

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Unit 1 Homework 3: Cell Structure and Function Name: Davis Sharneice U1HW3Remember to rename the file when you download it, lastnamefirstnameU1HW3.doc1.What is a phospholipid bilayer also known as? What is its function?Cell membraneEnable cells to communicate with each other and provides passage of material in and out the cell2.What is an integral membrane protein? A peripheral membrane protein?Integral membrane proteins penetrate the lipid bilayerPeripheral membrane is on one side of the bilayer from the outside rather than being embedded3.Summarize what is meant when we say the plasma membrane is selectively permeable.It means that it regulates entry and exit of substances4.Explain the difference between active and passive membrane transport?Active membrane process doesn’t require ATP to work with a concentration gradientPassive require ATP, usually work against gradients5.Define diffusion. Is it active or passive?Diffusion is Passive, it is the movement of molecules, from a higher concentration to region of lower concentration6.Define facilitated diffusion. Is it active or passive?Facilitated diffusion is passive. It is diffusion across the cell membrane through the ion transporters7.Can fat soluble substances like steroids and cholesterol cross the cell membrane on their own?
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