IB Bio

What happens when you put a drop of oil in water?

• The oil droplet stay together and moves toward one side of the beaker

• The oil droplet stays together and has a rough, undefined shape

• The oil droplet breaks apart and dissolves

• The oil droplet stays together and makes

  a perfect circular shape

What are the properties of a phospholipid molecule?

• Non Polar, hydrophobic head; Polar, hydrophilic tail

• Polar, hydrophilic head; Non Polar, hydrophobic tail

• Polar, hydrophobic head; Non Polar, hydrophilic tail

• Non Polar, hydrophilic head; Polar, hydrophobic tail

What is the function of the phospholipid bilayer?

• It provides a barrier that marks the outside of the cell

• It helps actively move and transport crucial proteins around the cell

• It produces proteins needed for basic functions of the cell

• It helps you with your biology homework

What model disproved the Davson-Danielli model?

• Pastuer-Wilson model

• Nelson-Ansari model

• Singer-Nicholson model

• Watson-Carson model

What is false about the membrane?

• phospholipids are fluid and move laterally

• Peripheral proteins are bound to the outer surface of the membrane

• Integral proteins permeate the surface of the membrane

• Proteins can move laterally along membrane

What does TRACIE stand for in terms of protein function?

• Transport, Receptors, Anchorage, Cell modification, Intercellular detachment, Enzymatic activity

• Transport, Recalibration, Anchorage, Cell recognition, Intercellular joinings, Enzymatic folding

• Transport, Receptors, Antibiotics, Cell recognition, Intercellular detachment, Enzymatic folding

• Transport, Receptors, Anchorage, Cell recognition, Intercellular joinings, Enzymatic activity

What is false about integral proteins?

• Integral Proteins are free flowing proteins

• Integral Proteins are permanently embedded in the membrane

• Integral Proteins all the way through the membrane and are polytopic

• Integral Proteins penetrating just one surface of the membrane are monotopic

What are glycoproteins used for?

• Glycoproteins are used as an indicator for the type of membrane and function each cell has

• Glycoproteins have oligosaccaride chains that help cell recognition by the immune system and are used as hormone receptors

• Glycoproteins have oligosaccaride chain that help them identify and receive new proteins from different cells

• Glycoproteins are used to gauge stress in the body and release certain proteins and chemicals to help maintain homeostasis (eg. when taking this final)

What is Cholesterol's function?

• It helps maintain Vitamin C levels and control fat regulation in your body

• It regulates how tightly or loosely the phospholipids should pack based on water / solute and protein levels

• It makes the phospholipids pack more tightly and regulates the fluidity and flexibility of the membrane

• It helps strengthen the membrane and increases the number of phospholipids present

Do both Integral and Glycoproteins go fully through the membrane?

• Only integral, not glyco

• Only glyco, not integral

• Neither does

• Both do