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Exponential Phase Cells - Microbial Diversity - Exam, Exams of Biology

AMET UniversityBiology

Exponential Phase Cells, Adapting To Their Environment, Producing Secondary Metabolites, Dividing Rapidly, Losing Viability Rapidly, Lacking Nutrients, Lipid Monolayer, Reproductive Structures, Sites of Protein Synthesis, Vibrio Cholerae. Past exam paper for biological courses are available here. I expect people will get some help if they need.

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2011/2012

Uploaded on 11/30/2012

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ARHOLIADAU EXAMINATIONS
SEMESTER 2 EXAMINATIONS 2012
INSTITUTE OF BIOLOGICAL, RURAL AND ENVIRONMENTAL SCIENCES
BR12110 MICROBIAL DIVERSITY
TIME ALLOWED: TWO HOURS
Answer ALL multiple choice questions from section A on the separate computer
sheet.
Answer ONE question each from sections B and C, each in a separate answer
book.
INSTRUCTIONS FOR MULTIPLE CHOICE QUESTIONS
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.
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Download Exponential Phase Cells - Microbial Diversity - Exam and more Exams Biology in PDF only on Docsity!

ARHOLIADAU EXAMINATIONS

SEMESTER 2 EXAMINATIONS 2012

INSTITUTE OF BIOLOGICAL, RURAL AND ENVIRONMENTAL SCIENCES

BR12110 MICROBIAL DIVERSITY

TIME ALLOWED: TWO HOURS

Answer ALL multiple choice questions from section A on the separate computer

sheet.

Answer ONE question each from sections B and C, each in a separate answer

book.

INSTRUCTIONS FOR MULTIPLE CHOICE QUESTIONS

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.

Section A (50 marks) Answer ALL questions

  1. During exponential phase cells are a) adapting to their environment b) producing secondary metabolites c) dividing rapidly d) losing viability rapidly e) lacking nutrients.

  2. Bacterium X has an optimum growth temperature of 30oC where it can double every 30 minutes. It can also survive at temperatures between 0 and 40oC. One hundred of these bacteria are inoculated into a flask and incubated at 30oC for one hour. The temperature is then increased to 50oC for one hour before being returned to 30oC for a further hour. Assuming the medium was optimal for growth and there was no lag phase how many bacteria would there be at the end of this experiment? a) 200 b) 300 c) 400 d) 800 e) 1600

  3. The influenza virus a) replicates rapidly in complex growth medium b) has RNA as its genetic material c) only infects humans d) is an orbivirus e) has no surface antigens.

  4. Microscopic observation of a sample reveals the following:-

Which of the following organisms is this most likely to be? a) Streptococcus mutans b) Escherichia coli c) Micrococcus luteus d) Bacillus anthracis e) Staphylococcus aureus

  1. Which of the following statements is true? a) Mitochondria are often found in prokaryotic cells b) All prokaryotic cells have a cell wall c) Flagella are found only at the poles of prokaryotic cells d) All prokaryotic cells carry plasmids e) All prokaryotic cells have a cell membrane

  2. The periplasmic space is a) found only in Gram positive bacteria b) found only in Gram negative bacteria c) found in all bacteria d) a component of the nucleoid e) a vacuole.

  1. Which of the following is NOT found in Gram negative cells? a) Cell membrane b) Teichoic acid c) Peptidoglycan d) N-acetylglucosamine e) Outer membrane

  2. Microscopic examination of a sample reveals the following:-

Which of the following best describes these bacteria? a) Peritrichous b) Amphitrichous c) Atrichous d) Monotrichous e) Zygotrichous

  1. Phospholipid fatty acids (with glycerol-ester linkages) are found in the membranes of which of the following? a) Eukarya b) Bacteria c) Archaea d) a & b e) b & c

  2. Archaea are involved in which of the following: a) Lignin degradation b) Methanogenesis c) Human skin disease d) Potato blight e) Penicillin production

  3. Which genetic locus is most widely used for classifying microbes a) tRNA b) rRNA c) mRNA d) mitochondrial DNA e) dsRNA

  4. Which of the following is an example of a fungal secondary metabolite. a) citric acid b) protease c) streptomycin d) tempe e) penicillin

  5. The industrial production of penicillin was first developed by a) Alexander Fleming b) Florey and Chain c) Glaxo PLC d) Louis Pasteur e) Crick and Watson

22) Coffee Rust caused by Hemileia vastatrix a) has decimated cocoa production in South America b) led to increased tea production in Sri Lanka when it infected coffee crops in Asia c) is a potential threat to coffee production but is restricted to Kenya at present d) was a problem in the 19th century but has been contained using biological control e) is responsible for the unique taste of Malayisan coffee

  1. The rumen is found between the a) oesophagus and stomach b) stomach and jejunum c) jejunum and ileum d) ileum and caecum e) caecum and colon

  2. Which group of microbes are mainly responsible for degrading microbial protein in the rumen a) Archaea b) Viruses c) Bacteria d) Protozoa e) Fungi

  3. Rumen microbes digest plant tissues. In what form are nutrients taken up into the bloodstream of the host ruminant? a) methane b) volatile fatty acids c) simple sugars d) lipids e) amino acids

  4. How does the myxomycete plasmodium grow? a) Nuclear division without cell division. b) Formation of porous septa c) Cell division without nuclear division. d) Hyphal growth e) Budding of daughter cells

  5. In ascomycete fungi, where do the processes of karyogamy and meiosis take place? a) In the growing hyphae. b) In the conidia. c) In the ascus. d) In the asci and conidia. e) In the clamp connections

  6. With regard to the main distinguishing features of chytridiomycete fungi, which of the following statements is correct? a) chytrids have a yeast form of growth b) chytrids produce only biflagellate zoospores c) some chytrids lack mitochondria and are obligately anaerobic d) the cell walls of chytrids contain no chitin e) chytrid zoospores are produced directly on the surface of the mycelium

  1. Which of the following descriptions Is unlikely to be characteristic of a fungus which relies on animals to disperse Its spores? a) production of odours b) production of zoospores c) growth in insect nests d) growth on dung e) sporulation on the anthers of a host plant

  2. What is the name of the phenomenon whereby spores of some fungi do not germinate after dispersal until they receive a particular environmental stimulus? a) anastomosis b) positive phototropism c) dormancy d) negative phototropism e) indeterminacy

  3. Which one of the following statements about the global carbon cycle is correct? a) All organisms need an external supply of organic carbon. b) In terrestrial systems the flow of carbon from the plant subsystem to the herbivore subsystem is greater than that to the decomposer subsystem. c) In terrestrial systems the flow of carbon from the plant subsystem to the decomposer subsystem is greater than that to the herbivore subsystem d) The decomposer susbsystem is composed only of microorganisms e) Fungi can fix atmospheric CO 2 and convert it to organic forms

  4. Some fungal pathogens produce structures called haustoria during infection of the host. What Is the main function of these structures? a) to penetrate the host epidermis b) to kill host cells c) to facilitate dispersal by insect vectors d) to suppress the resistance response of the host e) to maximise the contact area with the host cell for nutrient uptake by the pathogen

  5. Which of the following statements relating to Dutch Elm Disease caused by Ophiostoma ulmi Is untrue? a) toxins are produced by the fungus b) intracellular penetration of host cells c) insect vector involved d) a vascular wilt e) yeast-mycelial transition involved

  6. Ectomycorrhizal fungi are generally found associated with which type of plant host? a) shrubs b) trees c) grasses d) most plants e) crop plants

  1. Which of the three types of mycorrhizal association involve intracellular colonisation of host cells? a) Ectomycorrhizas b) Vesicular-arbuscular (VA) mycorrhizas c) Ericaceous mycorrhizas d) a,b & c, since mycorrhizas are always associated with the penetration of host cells e) b & c

  2. Lichens involve which of the following groups of fungi? a) Zygomycetes b) Ascomycetes c) Chytrids d) Yeasts e) Mycomycetes

  3. In which of the following habitats/substrata are lichens not found as dominant organisms? a) Deserts b) Grassland c) Tundra d) Rocks e) Tree bark

  4. What is the name given to the structures by which foliose lichens are attached to their substrata? a) mycobionts b) rhizines c) rhizomes d) roots e) rhizoids

  5. The cell walls of cyanobacteria are composed mainly of a) pectin b) cellulose c) chitin d) peptidoglycan e) agar

  6. Viruses possess genetic material comprised of: a) RNA only b) DNA or RNA c) DNA only d) DNA and RNA together e) protein only

  7. Domoic acid is: a) a toxin produced by a diatom b) induces neurotoxic shellfish poisoning c) a toxin produced by the Cryptophyceae d) a toxin produced by a dinoflagellate e) a by-product of phytoplankton photosynthesis