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Suppose you were culturing a population of bacteria at 15oC and then raised the temperature of the culture to 37oC. What effect do you think this might have on the fatty acid composition of the membrane? On the transition temperature of the lipid bilayer? On the activity of membrane desaturases?

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Nelly Stracke
Nelly StrackeLv2
28 Sep 2019
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Related questions

Microbial Growth

You are designing an experiment to understand the effect thattemperature has on the

growth of your bacterium, Enterococcus faecium. You are tryingto answer the following

questions.

a) What is the population number at the end of your experimentif the bacterium is grown at 37oC?

b) Will the population number be affected if the temperature isreduced from 37oC to 25oC? If so, how?

a. e.g. Do you expect to population size to increase, decreaseor remain the

same?

b. Provide a rationale for your answer.

You know the following pieces of information.

a) Doubling time for your bacterium is 20 minutes at 37oC.

b) You will allow your culture to grow exponentially for 8hours.

c) The initial number of cells used to start your experiment is5 x 10^3

.

d) When grown at 37oC for 12 hours, there are 5 x10^8

cells at the end of the experiment.

e) Enterococci are able to grow at different ranges oftemperature (5oC-65oC) and pH

(4.5-10), but 42.7 is optimum.


Select one answer.

How does the selective permeability of the membrane help thecell.

This allows the cell to maintain the proper shape.

This allows the cell to regulate what enters and exits

This allows the cell to maintain a constant temperature.

All of these

Question 6

Select one answer.

What is the role of carbohydrates in the plasma membrane?

cellular identification

adhesion

transport materials across the membrane

help maintain fluidity

Question 7

Select one answer.

Which component of the plasma membrane has the widest variety offunctions?

sterols

carbohydrates

phospholipids

proteins

Question 8

Select one answer.

All of the following have an effect on the fluidity of amembrane except:

interactions among fatty acids in the core of the bilayer

the cholesterol content

the ratio of saturated to unsaturated fatty acids

the presence of integral proteins in the membrane

A set of erythrocytes is placed in a beaker of 0.9% NaCl.Nothing appears to happen to the cells. Why?

0.9% NaCl is hypertonic to the cells.

Sodium blocks the movement of water.

0.9% NaCl is hypotonic to the cells.

0.9% NaCl is iostonic to the cells.

water has not moved at all.

Question 2

Select one answer.

Which substance would be mostlikely to pass through a lipid bilayer/plasma membrane withoutembedded proteins?

water

a steroid hormone

a large fatty acid

a large peptide hormone

a sodium ion

Question 3

Select all that apply.

Which of the following can cross the cell’s plasmamembrane without the assistance of protein transporters?Select all that apply.

large polar molecules

positively charged ions

small hydrophobic molecules

gasses

Question 4

Select one answer.

Biological Membranesare:

symmetrical.

impermeable.

static.

dynamic.

Question 5

Select one answer.

How does the selectivepermeability of the membrane help the cell.

This allows the cell to maintain the proper shape.

This allows the cell to regulate what enters and exits

This allows the cell to maintain a constant temperature.

All of these

Question 6

Select one answer.

What is the role of carbohydratesin the plasma membrane?

cellular identification

adhesion

transport materials across the membrane

help maintain fluidity

Question 7

Select one answer.

Which component of the plasmamembrane has the widest variety of functions?

sterols

carbohydrates

phospholipids

proteins

Question 8

Select one answer.

All of the following have aneffect on the fluidity of a membrane except:

interactions among fatty acids in the core of the bilayer

the cholesterol content

the ratio of saturated to unsaturated fatty acids

the presence of integral proteins in the membrane

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