Wk 1_Vid 9-10

Question 1

is a phospholipid a monomer or polymer?

Answer 1

monomer

Question 2

describe structure of phospholipid

Answer 2

1 glycerol

2 fatty acid chains

1 phosphate group

Question 3

amphipathic (definition)

Answer 3

a molecule w/ both hydrophilic and hydrophobic properties

Question 4

what are the polar and non polar parts of the phospholipid?

Answer 4

polar, hydrophilic head –> phosphate group (also includes glycerol)

non polar, hydrophobic tail –> fatty acid chains

Question 5

what do phospholipids form in water?

Answer 5

micelles

or

phospholipid bilayer

Question 6

what are the characteristics of life?

Answer 6

1) complexity and organization (requires energy to actively maintain)

2) respond to environment (homeostasis) –> maintaining of constant internal conditions

3) growth and metabolism

4) reproduction/heredity

5) evolve

Question 7

what are the 2 basic cell types?

what are examples of each?

Answer 7

eukaryotic – animals, plants, fungi, protists

prokaryotic – bacteria and archaea

Question 8

what are major differences b/n eukaryotes and prokaryotes?

Answer 8

eukaryotes:
- have nucleus and an internal membrane system
- can be up to 1000 times larger than prokaryotic cells

prokaryotes:
- no nucleus
- no internal membrane system

Question 9

cell ___ represents demand –> there is lots of ___ occurring (greater ___ = greater demand)

Answer 9

volume

metabolism

volume

Question 10

cell ___ represents supply –> everything that enters the cell must go thru its ___

Answer 10

surface area

Question 11

to survive, ___ >= ___

Answer 11

supply >= emand

Question 12

as cell size increases, cell ___ (demand) increases/decreases faster/slower than cell ___ (supply)

so at some point, ___ begins to outstrip ___

Answer 12

volume increases faster than cell surface area

at some point, demand begins to outstrip supply

Question 13

thus, remaining ___ allows cells to maintain a workable surface area to volume ratio

Answer 13

small