bio lab quiz

What carbohydrate does milk contain?

Lactose

Lactose is a ___ made up of the ______ glucose and galactose

1-disaccharide

2- monosaccharides

Lactase is an _____ which acts as a _____

1- enzyme

2- catalyst

Which type of macromolecule is lactase?

Protein

Where is your body is lactase normally found?

Small intestine

Why do some people have to take lactaid caplets"?

They do not produce lactase

What is the active ingredient in lactaid caplets

Lactase enzyme

Will skim milk have the same results as whole milk on the lipid test, why or why not?

No, they have different contents (fat&saturated)

What is the name of the protein found in milk?

casein

What will happen to the milk as vinegar is added to it?

It will coagulate and settle to the bottom.

What does Benedict’s solution lest for?

Simple sugars/monsaccharides

What does Sudan iv test for?

Lipids

What does Biuret’s indicator test for?

Proteins/polypeptides

Lactase breaks apart ____ into _____ and ____

Lactose, glucose, galactose

What were the observations after running the benedicts test on the carbohydrates?

It turned yellow/orange, to show monosaccharides were present.

Did the lactaid caplets break down the disaccharide, lactose, into monosaccharide?

yes, we could tell because the benedicts solution turned the liquid in the test tube orange.

Did the benedict’s test show which specific monosaccharides were present?

No, you cannot just look and determine this

Did the lactaid solution do the same as a natural lactase?

yes, it separated the lactose into monosaccharides.

What would have happen in the benedict’s test if the lactaid did not work?

it would remain blue, and monosaccharides- would not be present.

What was the result of the Sudan IV test?

There was a red layer of liquid, on top of a white layer of liquid. There were lipids

Did the milk leave a spot on the paper towel after it dried, why?

yes, milk has fatty acid tails, which are not polar and non polar substances dissolve in other non polar substances.

What was the result of the Biurets test? was there protein in the milk?

There was protein in the milk, in the form of curdles, it turned blue to purple.

Which macromolecules are found in milk

Carbohydrates, lipids, and proteins. milk contains casein, which makes up most of protein content. carbs contain lactose, which contains glucose and galactose. Milk contains tryglicerides, which are lipids. There is no nucleic acids, because milk does not have DNA or RNA

If I chew on a saltine cracker fore 2 min. then starch (polysaccharide) will be broken down into a…

Disaccharide

What process disassembles polymers?

hydrolysis

What is starch?

Polymer made from thousands of sugar molecules joined together. its a polysaccharide

What monosaccharide assembles to form starch?

glucose

why shouldn’t you eat sweets before this lab?

there would be monosaccharides, and effect the lab

Before the cracker was the saliva positive or negative?

negative

Which polysaccharide is found in a saltine cracker.

starch

if I change the temp of my spit, the rate of hydrolysis will…

change, because enzymes will work at different rates.

did temp impact the rate of hydrolysis of starch into glucose?

yes. the test tubes took different amounts of time to change color, the boiling water changed the fasts, then room temp, the ice water.