MYE Revision

Which terms describe the method by which water is transported within xylem vessel elements?

1 cotransport

2 cohesion-tension

3 osmosis

• 1 and 2

• 1 and 3

• 2 only

• 3 only

Name the site in the enzyme where the non-competitive inhibitor could bind.

• active site

• allosteric site

• enzyme-substrate complex

• substrate

Fig 3.1 shows a stage of mitosis in a cell from a root tip of Allium cepa.

Identify the the stage that is opposite to the events happening from the diagram shown.

The globular proteins takes the role of being structural in making the plasma membrane and functional as enzymes.

Give one similarity and difference between proteins in the cell surface membrane and enzymes.

• Both are tertiary structure. Enzymes are biological catalyst while cell membrane proteins are passage of charged particles.

• Both are secondary structure. Enzymes are biological catalyst while cell membrane proteins are passage of charged particles.

• Both are secondary catalyst. Enzymes hydrophobic amino acid are outside facing phospholipid bilayer while cell membranes proteins hydrophilic amino acids are inside facing the core.

• Both are quaternary structure. Enzymes hydrophilic amino acid are outside facing phospholipid bilayer while cell membranes proteins hydrophobic amino acids are inside facing the core.

Which of the following characteristics distinguishes prokaryotic organisms from eukaryotic organisms?

• Prokaryotes lack a cell membrane, while eukaryotes have.

• Prokaryotes are structurally less complex than eukaryotes

• Prokaryotes require a host to replicate, while eukaryotes do not.

• Prokaryotes are unicellular, while all eukaryotes are multicellular

Tay-Sachs disease occurs when cells are unable to produce an enzyme with hydrolytic properties, leading to a build-up of certain lipids in cells.

Which cell structure would not function correctly, resulting in the disease?

• Golgi apparatus

• lysosome

• mitochondrion

• smooth endoplasmic reticulum

Bonds are formed by condensation in cellulose, sucrose and haemoglobin.

What are the names of these bonds?

• cellulose- glycosidic

  sucrose- ester

  haemoglobin- ester

• cellulose- glycosidic

  sucrose-glycosidic

  haemoglobin- peptide

• cellulose- peptide

  sucrose-glycosidic

  haemoglobin- ester

• cellulose- peptide

  sucrose-glycosidic

  haemoglobin- peptide

Which of the following determine the tertiary structure and function of a polypeptide?

• length of the polypeptide

• number of nucleotides present in the polypeptide

• repeated units of glycerol making up the polypeptide

• interactions between amino acids present in the polypeptide

What type of microscope is used in the diagram shown?

What is the function of the components of the cell membrane labelled L?