lecture outline
3.1 cells are the smallest unit of life
a. a human cell has three main parts:
1.
2.
3.
part 1: plasma membrane
3.2 the plasma membrane is a double layer of with embedded proteins
a. membrane lipids form a bilayer, composed of two layers of (75%) with small amounts of (5%), and (20%).
1. the tails of phospholipids are and line up facing each other in the interior of the bilayer, while the phospholipid heads to face the inner and outer surfaces of the membrane.
2. helps maintain the membrane stability of the plasma membrane.
3. are lipids with sugar groups located on the outer membrane surface.
b. cell junctions
1. are integral proteins that form an impermeable junction that prevents molecules from passing through the extracellular space between cells.
where do you find these in the body?
2. are anchoring junctions that are scattered along the sides of adjoining cells that prevent their separation and reduce the chance of tearing when a tissue is stressed.
where do you find these in the body?

Question

lecture outline
3.1 cells are the smallest unit of life
a. a human cell has three main parts:
1.
2.
3.
part 1: plasma membrane
3.2 the plasma membrane is a double layer of  with embedded proteins
a. membrane lipids form a bilayer, composed of two layers of (75%) with small amounts of (5%), and (20%).
1. the tails of phospholipids are  and line up facing each other in the interior of the bilayer, while the  phospholipid heads to face the inner and outer surfaces of the membrane.
2.  helps maintain the membrane stability of the plasma membrane.
3.  are lipids with sugar groups located on the outer membrane surface.
b. cell junctions
1.  are integral proteins that form an impermeable junction that prevents molecules from passing through the extracellular space between cells.
where do you find these in the body?
2.  are anchoring junctions that are scattered along the sides of adjoining cells that prevent their separation and reduce the chance of tearing when a tissue is stressed.
where do you find these in the body?

Accepted Answer

# Brief Explanations:
1. A human cell has three main parts: the nucleus, cytoplasm, and plasma membrane.
2. The plasma membrane is a double - layer of phospholipids with embedded proteins. Membrane lipids form a bilayer, composed of two layers of phospholipids (75%) with small amounts of cholesterol (5%) and glycolipids (20%). The tails of phospholipids are hydrophobic and line up facing each other in the interior of the bilayer, while the hydrophilic phospholipid heads face the inner and outer surfaces of the membrane. Cholesterol helps maintain the membrane stability of the plasma membrane. Glycolipids are lipids with sugar groups located on the outer membrane surface.
3. Tight junctions are integral proteins that form an impermeable junction that prevents molecules from passing through the extracellular space between cells. They are found in the lining of the digestive tract, among other places. Desmosomes are anchoring junctions that are scattered along the sides of adjoining cells that prevent their separation and reduce the chance of tearing when a tissue is stressed. They are found in tissues like the skin and heart muscle.
# Answer:
1. Nucleus, Cytoplasm, Plasma membrane
2. Phospholipids; Phospholipids, Cholesterol, Glycolipids; Hydrophobic, Hydrophilic; Cholesterol; Glycolipids
3. Tight junctions, Digestive tract lining (among others); Desmosomes, Skin and heart muscle (among others)

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