MCQ-2: Biological Molecules
There are twenty questions in this quiz. Select the correct answer from the given choices.
0 of 16 Questions completed
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
0 of 16 Questions answered correctly
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
The diagram shows two food molecules before and after they have been digested by enzymes.
What identifies the products of fat digestion?CorrectIncorrect
Four foods were tested for each of the following nutrients:
- fat (using ethanol);
- protein (using the biuret test);
- reducing sugar (using Benedict’s solution),
Which food contains protein and fat?
colour of result of food test purple / lilac brick-red / orange milky-white A ✓ x ✓ B ✓ x x C x ✓ ✓ D x ✓ x
✓= nutrient present
x = nutrient absentCorrectIncorrect
Which simple molecules are the basic units of protein?CorrectIncorrect
Which substance catalyses the breakdown of fats to fatty acids and glycerol?CorrectIncorrect
Commercial fishermen use ice to store the fish that they catch.
How does the ice keep the fish fresh?CorrectIncorrect
The roots of plants take up nitrates from the soil.
What are the nitrates used to make?CorrectIncorrect
An experiment is set up to investigate gas exchange in aquatic plants.
The hydrogencarbonate indicator solution is orange at the start.
Which colour is it after three hours?CorrectIncorrect
The diagram shows the structure of part of a DNA molecule.
What does X represent?CorrectIncorrect
What is the colour change shown by Benedict’s solution when heated with a reducing sugar?CorrectIncorrect
Two pieces of an aquatic plant were placed into two different test-tubes, P and Q.
Each test-tube contained hydrogencarbonate indicator and was sealed and kept at 20 °C.
Test-tube P was kept in the light and test-tube Q was kept in the dark.
The table shows the effect of carbon dioxide on the colour of the hydrogencarbonate indicator.
dark red orange
What would the colour of the indicator be after 12 hours?
P Q A dark red orange B dark red dark red C orange dark red D orange orangeCorrectIncorrect
The data show the concentrations of sugar and starch in an onion.
total sugar including
/ g per 100g
/ g per 100g
The onion is tested with Benedict’s solution and iodine solution.
Which set of results is correct?
A blue blue-black B blue brown C brick red blue-black D brick red brownCorrectIncorrect
Which statement about the structure of DNA is correct?CorrectIncorrect
The base sequence of part of one strand of a DNA molecule is shown.
What is the base sequence of the other strand?CorrectIncorrect
Which processes depend on the fact that water is a solvent?
from the spongy
in blood plasma
movement of water
loss of sweat from
the skin surface
A ✓ ✓ ✓ ✓ B ✓ ✓ ✓ x C ✓ x x ✓ D x ✓ ✓ xCorrectIncorrect
Which identifies the chemical elements found in proteins?
carbon hydrogen oxygen nitrogen A ✓ ✓ ✓ ✓ B ✓ ✓ ✓ x C ✓ x ✓ x D x ✓ x ✓
✓ = present
x = absentCorrectIncorrect
A student carries out a test to see whether the solution in a test-tube contains protein.
Which row shows the correct food test and a positive result?
name of test colour seen with a
A Benedict’s test blue-black B Benedict’s test purple C biuret test blue-black D biuret test purpleCorrectIncorrect
Please confirm you want to block this member.
You will no longer be able to:
- See blocked member's posts
- Mention this member in posts
- Invite this member to groups
- Message this member
- Add this member as a connection
Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.You have already reported this