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ARHOLIADAU EXAMINATIONS
SEMESTER 2 EXAMINATIONS 2011
IBERS (BIOLOGICAL SCIENCES)
BS00310 CELL BIOLOGY
TIME ALLOWED: TWO HOURS
ANSWER ALL QUESTIONS IN THE SPACES PROVIDED ON THE QUESTION
PAPER. ALL QUESTIONS ARE WORTH THE SAME NUMBER OF MARKS
Rhif Cyfeirio’r Myfyriwr/ Student Reference Number: ……………………………………………
Dyddiad/Date ……………………………………………… Ystafell Arholiad/Examination Room ……………………………………………… Rhif y Sedd/Seat Number ………………………………………………
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- The answers must be legibly written. The Examiners can either ignore illegible script or have it typed and the expense of ty charged to the candidate. ping
- Write your answers in ink.
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- If you leave the examination early, please do
- so quietly so as not to disturb other candidates.
- Rhowch y wybodaeth angenrheidiol yn y blychau uchod a rhowch eich enw yn y man gwag ar dop y tudalen ar dde ar dop y tudalen (gan ddefnyddio’r slip gludiog y dde. Plygwch a seliwch y cornel ochr a ddarperir) er mwyn cuddio eich enw.
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Fold over and stick down/plygwch y gornel drosodd
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Enwau Cyntaf/
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- State the ‘Cell Theory’
Read the following statements and place a tick in the appropriate box depending on whether the statement is true of prokaryotic or eukaryotic cells. Statement Prokaryotic Eukaryotic DNA contained within nucleus Typically <= 2 m in size Name means ‘true kernal’ Endomembrane system present Ancestral mitochondria belonged to this group Fungi belong to this group Bacteria belong to this group
- Explain why the words fluid and mosaic are used to describe the structure of themembrane.
Fluid
Mosaic
Cells can be ‘stained’ using chemicals dissolved in water. When sections of the cell me membrane has a three layered appearance as shown in figure 1. Suggest why thembrane from such ‘stained’ cells are observed using the electron microscope, the membrane has this appearance.
Figure 1
- List three types of mammalian muscle cell and list the unique features of each type.
Muscle Cell Type Unique features
In a mammalian neuron what is the typical resting potential (in mV)? __________________ What plasma membrane protein is responsible for maintaining the resting potential?
What ion enters neurons triggering depolarisation during the action potential? ___________ What ion leaves neurons at the end of the action potential helping the cell to restore the resting potential?
- Look at figure 3 and then answer the questions that follow.
Figure 3. Diagram of an animal epithelial cell layer showing connections between individual cells and between the cells and components outside of the cells. ECM = extracellular matrix.
Give the names and functions of the structures labelled A and B. Name Function A B
What is the name of layer C_____________________________________________________________
Give the names of two proteins commonly found in the ECM and state their functions. Name Function
Give one function of the integrin group of proteins.
- Give the names of three types of RNA and state the function of each type named. Name Function
What is a nucleosome?
What proteins are the main components of nucleosomes?
How does heterochromatin differ from euchromatin?
What effect does heterochromatin have on transcription?
- Look at figure 4 and then answer the questions that follow.
Figure 4. Diagrammatic representation of a flagellum. Is this a prokaryotic or eukaryotic flagellum?
What type of motion is this flagellum capable of ________________ Briefly describe how the energy to drive this flagellum is supplied.
In dynein-powered flagella what is the source of energy?
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