Lecture 1

Question 1

Plasma Membrane

Answer 1

surrounds cell surface

Question 2

Cell Organelles

Answer 2

• perform specific functions; compartmentalize

Question 3

Nucleus

Answer 3

houses the genetic material

Question 4

Cytoplasm

Answer 4

region outside the nucleus

Question 5

Plasma Membrane Functions

Answer 5

1. ) physical barrier
2. ) cell-to-cell communication
3. ) structural support
4. ) transport

Question 6

Biological Membranes

Answer 6

1. ) surround the cell
2. ) consist of a double layer of lipid molecules
3. ) consist of different ratios

Question 7

Lipids

Answer 7

1. ) contain primarily carbon and hydrogen

2. ) are amphipathic

Question 8

Phospholipid Structure

Answer 8

• polar head group (hydrophilic)
  a. ) phosphate
  b. ) nitrogen-containing group
  c. ) glycerol
• nonpolar tail (hydrophobic)
  a. ) 2 fatty acid chains

Question 9

Steroids

Answer 9

• cholesterol
• amphipathic
• maintains membrane fluidity

Question 10

Glycolipids

Answer 10

• CHO chain attached
• amphipathic
• outside plasma membrane
• form glycocalyx

Question 11

Membrane Proteins

Answer 11

• integral
• peripheral
• glycoproteins

Question 12

Cell Junctions

Answer 12

1. ) desmosomes
2. ) tight junctions
3. ) gap junctions

Question 13

Chromatin

Answer 13

DNA associated with proteins

Question 14

Nuclear Envelope

Answer 14

double-layered porous membrane

Question 15

Nuclear Pores

Answer 15

allows selective movement of molecules in and out of nucleus

Question 16

Nucleolus

Answer 16

synthesis of ribosomal RNA

Question 17

Ribosomes

Answer 17

• non-membrane bound
• protein synthesis
• two subunits
• two functional ribosomes
  
  1. ) free
  2. ) bound

Question 18

Endoplasmic Reticulum

Answer 18

• Rough ER
  a. ) granular
  b. ) flattened sacs
• Smooth ER
  a. ) agranular
  b. ) branched tubular structure

Question 19

Golgi Apparatus

Answer 19

• modifies proteins made in RER

- sorts and packages proteins

Question 20

Lysosomes

Answer 20

• contain digestive enzymes

- degrade extracellular and intracellular debris

Question 21

Peroxisomes

Answer 21

• oxidative enzymes

- removes hydrogen peroxide

Question 22

Cytoskeletal Filaments

Answer 22

• actin filament
• intermediate filament
• microtubule

Question 23

Cytoskeleton Functions

Answer 23

1. ) maintain cell shape
2. ) maintain organelle positions
3. ) mediate cell and organelle motility

Question 24

Mitochondria

Answer 24

• cell powerhouse
• double membrane
• number depends on energy needs of cell
• have own DNA