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ARHOLIADAU EXAMINATIONS
SEMESTER TWO EXAMINATIONS, 2012
INSTITUTE OF BIOLOGICAL, ENVIRONMENTAL AND RURAL SCIENCES
BR00310, CELL BIOLOGY
Time allowed: TWO HOURS.
Answer ALL questions.
Answer questions in the answer book provided. Numbers in square brackets indicate the marks for each section.
a) To which kingdom do the following cells or organisms belong? [4]
i. A diatom. ii. A neutrophil. iii. A yeast cell. iv. Paramecium.
b) The above are all examples of what type of cell? [2]
c) List four possible fates for animal cells following cell division. [4]
a) Do the following solutes pass readily through the membrane or not? What feature of each solute explains your answer? [4]
i. Na+ ii. Glucose. iii. O 2 iv. Salicylic acid.
b) Draw a simple graph showing facilitated diffusion. [3]
c) List three reasons for plants suffering water stress. [3]
a) Describe (or draw) the appearance of rough and smooth endoplasmic reticulum and give one function for each type. [6]
b) Draw a simple figure to show endocytosis and formation of lysosomes. [4]
Continued on next page.
a) Describe the structure of ribosomes and state their function. [5]
b) Draw a labeled figure of a nucleus as seen under the electron microscope. [5]
a) Name two mechanisms of movement in bacteria. [2]
b) What is the bacterial proton motive force and why is it important in movement. [4]
c) Draw a labeled cross-section of a eukaryotic flagellum. [4]
a) Name the three main layers in the cell wall of mature, fully-expanded plant cell and give a major constituent of each layer (name a different constituent for each layer). [6]
b) Give a function for each of the following proteins involved in cell adhesion and the extracellular matrix. [4]
i. Collagen. ii. Fibronectin. iii. Cadherins. iv. Laminins.
a) Give one distinguishing characteristic for each of the following three types of muscle cell. [3]
i. Cardiac. ii. Skeletal. iii. Smooth.
b) Draw a figure illustrating ion movements during the action potential, making sure that you clearly identify the ions involved, the plasma membrane proteins responsible for the action potential, and the relevant potential differences (voltages). [7]
a) Draw a fully labelled diagram of a cell membrane. [6]
b) Give the function of FOUR of the components of the cell membrane. [4]
Continued on next page.
