Molecular Bio Flashcards Preview

HSCI100 > Molecular Bio > Flashcards

Flashcards in Molecular Bio Deck (24):
1

are viruses alive?

no (requires host, no homeostasis)

2

why can cows eat grass but we can't?

lack enzymes that recognize linkages that can break down cellulose

3

elements

cannot be broken down by chemical means

4

optimal/max numbers of electrons per shell

1st: 2, 2nd(+): 8

5

covalent bonds

form when 2(+) atoms share the electrons in their outer shells

6

ion

(group of) atom(s) w/ a (+)/(-) charge

7

ionic bonds

result from attraction of oppositely charged ions, rather than shared electrons

8

H2O properties

1. doesnt change temp. quickly
2. high boiling point
3. frozen: less dense than liquid
4. surface tension
5. capillary action
6. hydrogen bonding
7. great solvent for polar molecules

9

H2O role in life

polar bond: electrons of a covalent bond are shared unequally
high heat capacity, high heat of vaporization, dissolving agent

10

hydrogen bonds

weak bonds that form between water molecules or between nucleotide bases of two strands of DNA

11

macromolecules

large biological molecules

eg: carbs, lipids, proteins, nucleic acids

12

polymers

long molecules of many identical or similar building blocks strung together (similar to beads)

13

dehydration synthesis

creating by removing water molecule, occurs when polymers are made

14

hydrolysis

breaks down polymers by adding water

15

carbohydrates

subunits: monosaccharides
short/long-term energy storage, simple and complex forms

16

polysaccharides

many carbon rings

eg: glycogen (animal storage form)
starch (plant form)

17

lipids

don't dissolve in water (non-polar)
used as energy molecules
found in cell membranes
found as fats and oils, phospholipids and steroids

18

fats

usually animal origin, solid @ room temp., long-term energy storage, insulation, cushion for organs

19

oils

plant origin, liquid @ room temp.

20

triglycerides

fats and oils
polymers: 1 molecule of glycerol + 3 fatty acids (bound through dehydration synthesis)

21

double bond triglycerides

unsaturated
(if not: saturated)

22

phospholipids

main component of plasma membrane
hydrophilic heads, hydrophobic tails

23

cholesterol and glycolipids

other lipids, regular components of membranes
C: helps stabilize plasma membrane

24

steroids

lipids, eg: cholesterol, sex hormones