Biology Quiz

If the actual length of the chloroplast measured along X–Y is 10 μm, what is the magnification of the image?

• ×6.3

• ×63

• ×630

• ×6300

Which cell structures do not contain cristae?

• 1, 2, 3 and 4

• 1, 2 and 4 only

• 1 and 2 only

• 3 and 4 only

Which letter represents cell structures where mRNA may be found?

• A

• B

• C

• D

Which row is correct for typical prokaryotic cells and mitochondria?

• 70S ribosomes no yes

• circular DNA yes no

• peptidoglycans yes no

• small size, 1–5μm long no no

Which statement is correct?

• A virus is composed of a protein coat which surrounds RNA or DNA.

• Suberin and cellulose are found in all plant cell walls.

• Plasmodesmata and centrioles are found in all plant cells.

• Prokaryotic cells contain an endoplasmic reticulum to synthesise proteins.

The Benedict’s test and ethanol emulsion test were carried out on a sample of biological molecules. The solution became brick-red during the Benedict’s test and cloudy during the ethanol emulsion test. Which molecules did the sample contain?

• Reducing sugars and lipids

• Proteins and reducing sugars only

• Starch, proteins and reducing sugars

• Non-reducing sugars and lipids

Which diagram is correct for α-glucose?

• AB

• CH

• CD

• DE

Which reaction correctly represents one way sucrose can form?

• (α-glucose – OH–) + (fructose – H+) → sucrose + H2O

• (α-glucose + OH–) + (α-glucose + H+) → sucrose – H2O

• (α-glucose – OH–) + (β-glucose – H+) → sucrose + H2O

• (α-glucose + OH–) + (fructose + H+) → sucrose – H2O

Which statement about alginic acid is correct?

• Alginic acid is a linear polysaccharide containing 1,6 glycosidic bonds between each hexose sugar.

• Alginic acid is formed from two monomers joined by 1,4 glycosidic bonds.

• Alternate monosaccharides are arranged in opposite directions; this is also seen in glycogen molecules.

• Hexose sugars and water molecules are joined by condensation reactions to make alginic acid.

Which features are correct for triglycerides and phospholipids?

• They have ester bonds between glycerol and fatty acids.

• Fatty acid chains may have single or double bonds between carbon atoms in the chains.

• The fatty acid chains are non-polar and hydrophobic.

• Saturated fatty acid chains allow closer packing of the molecules than unsaturated fatty acid chains.