Ch. 2 the chemistry of cells

Question 1

Organic compouds (3)

Answer 1

• ALWAYS contain: carbon
• most contain: oxygen and hydrogen
• green plants are the only organisms capable of producing food (organic molecules) from inorganic molecules

Question 2

Carbohydrates

Answer 2

Sugars and starches

Question 3

Lipids

Answer 3

Fats & oils

Question 4

Linear strand of amino acids

Answer 4

AKA: polypeptide & protein

Question 5

Standard

Answer 5

A known result with compared to experimental results

Question 6

Indicators

Answer 6

Chemicals that react with each of the classes of molecules by color change, which indicate the substance is present

Question 7

When iodine is placed on a material and it turns blackish - purple, _________ is present

• iodine
• black —-> purple
• _____ is present ?

Answer 7

Starch

Question 8

When Benedicts reagent is heated with certain sugars, it turns ___________

Benedicts
certain sugars added
It turns from _____ to _____

Answer 8

from blue to
green
yellowish-orange
or brick red

Question 9

In the presence of protein a biuret reagent will change from _________ to ____________

• Protein
• in a biuret reagent
• change from ____ to ____

Answer 9

blue to lilac purple

Question 10

Buffers

Answer 10

Substances that help maintain the PH level of a solution

by releasing or absorbing hydrogen ions

Question 11

Paper impregnated with litmus will turn __________ in the presence of an _________ and ________ in the presence of a __________

Answer 11

Paper impregnated with litmus will turn PINK in the presence of an ACID and BLUE in the presence of a BASE

pink= acid
blue= base