bio study quiz 1

1. (NH₂) group represents —

amino group

sperm is a

haploid

DNA is a

polymer

which of the following is not a function of protein

reproduction?

addition of water molecules in a chemical reaction is known as

hydrolysis

the empirical formula of carbohydrate is

(CH20)n

glucose (C₆H₁₂O₆) is a

monomer

water molecule contains the angle degree of

104.5

which one of the following has least amount of energy?

AMP?

peptide bonds are found in

proteins

the ability to respond to stimulius is an example of

sensitvity

the ultimate source of energy from life on earth is

the sun

in science a hypothesis can be changed after

a expierment

who wrote orginin of species by means of natural selections

charles darwin

amino acid is a

monomer

how many electrons are shared by N≡N 

six

nucleoside contains

???

nucleotide contains

base sugar and phosphate

nucleoside contains

base and sugar

The proposal that one type of organism can change gradually into another type over a long period of time is known as:  

evolution

Triglyceride is an example of 

fats

Recent discoveries of microscopic fossils have extended the known history of life to about:  

3.5 billion years ago ?

cations are _____ charge

positive

anions are _____ charge

negative

what part of the phospholipid is hydrophobic

tails

what part of the phospholipid is hydropholic

head

hydropholic

points towards water

hydrophobic

points away from water

what part of the phospholipid is nonpolar

tails

what part of the phospholipid is polar

head

_______ lipid molecules orient with polar head towards water and nonpolar away from water

micelle

unsaturated

1 or more double bonds low melting points plant orgin melts quicker

saturated

no double bonds between carbon atoms higher melting point animal orgin takes longer to melt

triglycerides

composed of 1 glycerol and fatty acids

fats are ______ in water

insoluble

insoluble

a substance that cannot dissolve in a liquid, or a problem that is impossible to solve

lipid are made up of

fatty acids

what links fatty acids together

CH bond (carbon and hydrogen)

chaperone

newly made proteins folded spontaneously it helps proteins folder correctly

denaturation

protein loses structures and functions due to environmental conditions

what environmental conditions can denaturate proteins

pH, temp and, ionic concentration of solution

pH

potential hydrogen

chaperones require _____ to refolded the protein

ATP

proteins have 4 levels of structures 1:

the shape of a protein determines its function

proteins have 4 levels of structures :primary structure

sequence of amino acids linking together

proteins have 4 levels of structures: secondary structure

Local folding patterns in the chain, such as coils ( a -helices) and flat folds (b-sheets), held by hydrogen bonds.(alpha; beta)

proteins have 4 levels of structures: Tertiary structure

the overall three-dimensional shape of a single protein chain

proteins have 4 levels of structures: Quaternary Structure:

The final arrangement when two or more independent protein chains join together to form a functional complex

pH scale 1-6

acidic (ex stomach acid, vinegar beer, black coffee)

pH scale 7

Neutral ex water

ph scale 8-14

akaline ex great salt lake, household ammonia, household bleach

buffer range

4 to 6.3 pH

buffer

is a chemical solution that stops large changes in pH (acidity or alkalinity) when small amounts of acid or base are added.

water contains ____hydrogen ____ oxygen

2;1

base structure that combines with H+ dissolved in water and this lower the H+ and ______ the pH

higher

acid a substance that dissociates in water to increase H+ and _____ the pH

lower

DNA is

Acid

100 degree Celsius is

boiling temp

0 degrees Celsius

freezing temp

molecule of water linked together by

hydrogen

the chemical o property is to form ____ bonds

H

the bonds between oxygen and hydrogen are highly

polar