Cell membrane carbohydrates participate in
1. transporting substances between two protein layers
2. cell-to-cell recognition
3. attaching the membrane to cytoskeleton
4. cell adhesions

A molecule of ATP is structurally most similar to :
1. RNA nucleotide

2. DNA nucleotide

3. amino acid

4. fatty acid

The unique properties of each amino acid is determined by its particular :
1. R group
2. amino group
3. finds of peptide bond
4. number of bonds to other amino acids

In competitive inhibition, if the concentration of the substrate is increased :
1. the rate of the reaction is increased
2. the rate of the reaction is decreased
3. the rate of the reaction is not affected
4. the reaction direction is reversed

Which of the following distinguishes the prophase1 of meiosis from the prophase of mitosis?
1. homologous chromosomes pair up
2. spindle forms
3. nuclear membrane breaks down
4. chromosomes become visible

The ion required as the co-factor for the proteolytic enzyme, carboxypeptidase, is:
1. Zinc

2. Copper

3. Iron

4. Manganese

With respect to meiosis, when does DNA replication occur?
1. Before meiosis I only
2. After meiosis I only
3. Before and after meiosis I
4. After meiosis II

The component molecules of the cell membrane have two main parts, the head and the tail. These parts are either hydrophobic (repelled by water) or hydrophilic (attracted to water). Which is which?
1. Hydrophilic Head and Hydrophobic Tail
2. Both Hydrophobic
3. Hydrophilic Tail and Hydrophobic Head
4. Both Hydrophilic

The living state of an organism is a :
1. non-equlibrium steady state
2. non-equilibrium variable state
3. steady state in perfect equlibrium
4. variable state in perfect quilibrium

The main difference between active transport and facilitated diffusion is:
1. In active transport the molecules move from areas of high to areas of low concentration
2. In active transport, you need carrier proteins
3. In active transport you need ATP to move molecules against a concentration gradient
4. In active transport, only water molecules move.