Higher Human Biology - Cells

A cell measures 15mm, at a magnification of x300. What is the actual size of the cell in micrometres.

1mm = 1000 micrometres

• 0.05 micrometres

• 0.5 micrometres

• 5 micrometres

• 50 micrometres

DNA is a double stranded helix, but RNA is only a single stranded helix

• True

• False

BMI is calculated by using the formula:

• height divided by weight squared

• height squared divided by weight

• weight divided by height squared

• weight squared divided by height

A DNA molecule consists of 4000 nucleotides, of which 20% contain the base adenine.

How many of the nucleotides in this molecule will contain guanine?

• 800

• 1000

• 1200

• 1600

During glycolysis, dehydrogenase enzymes catalyse the

• removal of hydrogen ions and electrons from NADH

• removal of hydrogen ions and electrons from citrate

• transfer of hydrogen ions and electrons to glucose

• transfer of hydrogen ions and electrons to NAD

Glycolysis takes place in the mitochondrion

• True

• False

How many carbon atoms are in acetyl coenzyme A?

• 2

• 3

• 4

• 6

How many carbon atoms does pyruvate have?

• 2

• 3

• 4

• 6

In an animal cell, the mitochondrion is the site of:

• protein synthesis

• cell digestion

• cell respiration

• formation of spindle fibres

In proteins, amino acids are joined together by:

• polypeptide bonds

• weak hydrogen bonds

• peptide bonds

• sulphur bridges