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Components of the Cytoskeleton, Peripheral, Monotypic, Gpi Linked, Graph of Diffusion, Concentration Difference, Distance Diffused, Initiation of Eukaryotic Translation, Pectin Molecule, Hemicelluloses Differ from Cellulose are some points from questions of Biology of the Cell subject.
Typology: Exams
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ANSWER ALL MULTIPLE CHOICE QUESTIONS (Section A) ON THE SEPARATE COMPUTER SHEET
USE OF CALCULATORS IS ALLOWED
Answer all multiple choice questions on one optically marked sheet. You must answer each question in the order in which it appears on the question paper.
Complete the boxes on the optically marked sheet to give the following details - name, date, subject, module identifier and student number.
Student number should be completed by writing the digits in pencil in the top line of the box and then filling in the bar code boxes below with the first digit represented in column 1 , the second digit in column 2 and so on. This is done by striking through the little box with a soft pencil as shown in the instructions on the sheet for marking the correct answers. Other instructions are on the sheet, but note the following:-
There are five possible answers to each question, only one of them is correct.
Record your answers on the optically read sheet by using a soft pencil (HB or softer) to mark the appropriate box thus: Do not tick, cross or ring boxes and do not write elsewhere on the form.
1 mark is given for every correct answer. No marks added/deducted for incorrect answers. No marks added/deducted for blank answers.
If you make a mistake on the optically marked sheet, it can be corrected with a soft eraser.
Spare sheets are available in the examination hall.
Text B. Proteins that have hydrophobic domains that are inserted into the plasma membrane are referred to as X membrane proteins. They may cross both leaflets (layers) of the plasma membrane. Alternatively their hydrophobic domains may insert into only one leaflet in which case they are termed Y. In contrast, proteins that associate with the plasma membrane as a result of non-covalent interactions with lipid headgroups or other plasma membrane proteins are known as Z.
word or phrase chosen from the list below. Which word or phrase would you choose to replace X? a) Extrinsic. b) Integral. c) GPI-linked. d) Monotypic. e) Peripheral.
Figure 1
shown by this graph? a) Active. b) Direct. c) Facilitated. d) Indirect. e) Passive.
indicate? a) Concentration difference. b) Distance diffused. c) Rate of uptake. d) Temperature. e) Time.
Text C. The extracellular matrix (ECM) of cells consists of a matrix consisting largely of X. Embedded into the matrix are two main types of fibres. Y fibres are arranged in bundles and give the ECM its strength. Z fibres can stretch and relax giving the ECM flexibility.
Figure 2
Text F. There are three main components of the cytoskeleton. Microtubules are formed when tubulin dimers polymerise. Microtubules are organized at structures such as the X. Microfilaments are composed from polymerized Y and intermediate filaments consist of a range of different proteins including Z.
Question 3. Draw and label a figure showing the internal structure of a typical mitochondrion (6 marks).
Question 4. Describe (or sketch) the appearance of the rough endoplasmic reticulum under the electron microscope and give the reason for this appearance (3 marks).
List three functions carried out by the smooth endoplasmic reticulum (3 marks). Function 1
Function 2
Function 3
Question 5.
State four ways in which fluid-phase endocytosis differs from receptor-mediated endocytosis (4 marks). 1 3
How does fluid-phase endocytosis help maintain a constant cell size (2 marks)?
Question 6.
Give three problems in extracellular signal perception that are solved by cell-surface receptors. What features of receptors solve these problems? (6 marks) Problem Solution 1
Question 7.
What is the basic structure of cellulose (2 marks).
Give one way in which hemicelluloses differ from cellulose? (1 mark).