Molecules to metabolism quiz 2.1

This is a quiz of multiple choice style questions about the molecules to metabolism, topic 2.1

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Which of the following processes could be described as anabolism?

Anabolism is building up of large complex molecules from smaller simple units (Hint to remember: anacondas are long snakes).

Catabolism is the breakdown of large complex molecules into smaller ones.

What is meant by cell metabolism?

All the enzyme catalysed reactions are described as the cells metabolism.
These reactions are classified as anabolic or catabolic depending on whether they make bigger molecules from small ones, or vice versa.

 

Which of the following molecules contains nitrogen atoms?

Carbohydrates, lipids and phospholipids do not contain nitrogen.
Amino acids and DNA contain nitrogen.

 

The production of urea has been at the centre of discussions between biologists in history concerning the theory of vitalism.
What piece of experimental evidence used urea to falsify the theory of vitalism?

The formation of urea, known since 1773 experiments where the synthesis of an organic compound from two inorganic molecules was achieved for the first time weakened significantly the vitalistic hypothesis on the functioning of living cells,

 

Which of the following correctly identifies the monomers which make a triglyceride molecule when combined.

Triglycerides  are composed of a glycerol molecule and three fatty acids.

 

Which of the molecule diagrams below correctly represents an αD-glucose molecule?

Note: in glucose the four lower carbon atoms have -OH on one side, and -H on the other.

 

What type of molecule is shown in the diagram below?

Fatty acids have a long chain of carbon atoms surrounded by hydrogen and a carboxyl "COOH" group at the end.
This is a saturated fatty acid.

 

To test for a reducing sugar which of the following points best describes the procedure?

Benedict's reagent is used to test for reducing sugars.  It turns from blue to orange if the reducing sugar is present.

 

The image below shows the results of a chemical test for a biological molecule.

What is the test and what does a positive result show?

Iodine turns from straw yellow colour to a blue black colour in the presence of starch.

 

Amino acids are often drawn with a generalised R-group as shown below.

What does the R-group represent?

There are about 20 different amino acids found in living organisms and each has a different molecular structure in the R-group.

This can be a simple -H atom, in alanine, or a more complicated structure.

 

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