Biology U3AOS1 Exam Questions

Biology U3AOS1 Exam Questions

Multiple Choice

Which of the following represent members of the lipid family?

• W Only

• W and X

• W X and Y

• All four

Multiple Choice

The major role of molecule Z is to

• Encode Genetic Information

• Transport material into the cell

• Provide long term energy storage

• Help stablize the plasma membrane

Multiple Choice

When molecule X is being formed from its respective subunits

• Peptide bonds are formed

• there is a net output of energy

• a molecule of water is added

• A condensation reaction occurs

Multiple Choice

The export of protein from a cell would occur at

• Centroles

• lysosomes

• Golgi Apparatus

• Endoplasmic Reticulum

Multiple Choice

Consider the energy profile pictured. Which of the options below are correct based on the information on the diagram?

• This is an anabolic reaction

• this reaction would release energy

• The value of the activation energy is shown by x

• Product molecules T and U have less energy than the reactant particles R and S

Multiple Choice

In an experiment to investigate enzyme activity, the enzyme amylase was added to starch dissolved in water at 35 degrees. At the end of the experiment an increased concentration in maltose was found. In this scenario, what is the substrate?

• Water

• Starch

• Maltose

• Amylase

Multiple Choice

ATP is important for living cells because

• It is required for Osmosis

• Provides a supply of usable energy for the cell

• is a building block for lipid synthesis

• is an important structural component of the cell membrane

Multiple Choice

Which one of the following questions about proteins is correct?

• A protein with Quaternary structure will be an enzyme

• The primary structure of a protein refers to its three dimensional shape

• The activity of a protein may be affected by the temperature and pH of it's environment

• Proteins are not involved with the human immune response

Multiple Choice

Acetylchloinesterase is an enzyme that catalyses the break down of the neurotransmitter acetylcholine into acetate and choline. Aldicarb is is an insect spray that and a reversible inhibitor of acetylcholinesterase that will...

• permanently block the active site of acetylcholinesterase

• Acts by strongly binding to the active site of acetylcholinesterase

• increases the rate at which acetylcholinesterase breaks down acetylcholine

• Reduced acentylcholinesterase activity by reducing number of active sites avliable

Multiple Choice

What is label X referring to?

• Matrix

• Cristae

• Inner membrane

• Intermembrane space

Open Ended

Microtubules are hollow structures composed of protein called tubulin. Two types of tybulin, alpha and beta, bond together to form a dimer. These dimers then polymerise to form, which eventually becomes a microtubule. With reference to microtunules, what is meant by the term 'polymerise?' (1m)

Open Ended

Describe the chemical reaction that joins amino acids together when they form dimers (3 Marks)

Open Ended

Tryptase is an enzyme that is released along with histamine and other chemicals from mast cells. Nucleic acids encode the instructions the the synthesis of of tryptase in a mast cell. Outline the steps in translation of the tryptase enzyme. (3 Marks)

Open Ended

Glycogenolysis is the process of breaking down glycogen stored in the liver to increase blood glucose levels after high levels of exercise. Explain how facilitated diffusion of glucose into cells occurs (2 Marks)

Open Ended

The hormone that stimulates glycogenolysis, Glucagon, is hydrophillic. Describe how Glucagon would stimulate glycogenolysis in liver cells. (2 Marks)

Open Ended

Heart cells are some of the most demanding cells in periods of exertion. What organelle would be present in large numbers in heart cells and why is this necessary? (2 Marks)