Rachael Martin
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topic 1 and 2 for phy2011

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Rachael Martin
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PHY2011 - topic 1 and 2

Question 1 of 29

1

In which part of the body is the most water found?

Select one of the following:

  • Plasma

  • Interstitial fluid

  • Minor components

  • Intracellular fluids

Explanation

Question 2 of 29

1

Fill the blank space to complete the text.

The four main cations in cells are

Explanation

Question 3 of 29

1

The major intracellular cation is

Select one of the following:

  • Na+

  • K+

  • Ca++

  • Mg++

Explanation

Question 4 of 29

1

Fill the blank space to complete the text.

The defines a cell, and acts as a continuous barrier between the inside and outside, allowing for the creation of an internal environment

Explanation

Question 5 of 29

1

Which organelles are vesicles containing enzymes for the breakdown of material?

Select one of the following:

  • Mitochondria

  • Golgi apparatus

  • Lysosomes

  • Nucleoli

Explanation

Question 6 of 29

1

What is the purpose of the rough endoplasmic reticulum (RER) being continuous with the outer nuclear membrane?

Select one of the following:

  • As the RER produces proteins from the instructions of the nucleus, this allows fast movement between the two organelles

  • To create a larger surface area to volume ratio

  • As the RER produces proteins from the instructions of the nucleus, this allows for the RER to create extra messages for other organelles to produce proteins

  • To create a larger concentration gradient for the flow of proteins

Explanation

Question 7 of 29

1

Fill the blank space to complete the text.

Specialised junctions called link adjacent cells without sealing them into a sheet, giving them some degree of flexibility and being able to withstand stress

Explanation

Question 8 of 29

1

Select from the dropdown lists to complete the text.

The lipids of the cell membranes contain two ( non-polar, polar ) fatty acid chains stuck together by a ( non-polar, polar ) head group

Explanation

Question 9 of 29

1

Which component of the membrane regulates fluidity?

Select one of the following:

  • amphipathic

  • lipid micelles

  • cholesterol

  • potassium

Explanation

Question 10 of 29

1

Which proteins are not inserted into the membrane but rather associate with the membrane itself or another membrane protein?

Select one of the following:

  • integral transmembrane proteins

  • peripheral membrane-associated proteins

  • integral outer membrane proteins

  • integral inner membrane proteins

Explanation

Question 11 of 29

1

Select from the dropdown list to complete the text.

Integral proteins ( cannot, can ) be removed from the membrane without ripping it apart

Explanation

Question 12 of 29

1

Which of the following increases the permeability of the membrane?

Select one of the following:

  • membrane kinks

  • low temperature

  • high cholesterol

  • saturated fatty acids

Explanation

Question 13 of 29

1

Select from the dropdown list to complete the text.

The cell membrane is selectively permeable as it allows ( only some substances, all substances, most substances ) to pass freely

Explanation

Question 14 of 29

1

The advantages of a selectively permeable cell membrane include (more than one correct answer):

Select one or more of the following:

  • permits an internal environment

  • facilitates chemical reactions

  • allows uptake of toxic chemicals

  • allows development of electrical potential

Explanation

Question 15 of 29

1

Which of the following is a characteristic of passive transport?

Select one of the following:

  • requires use of ATP

  • requires a concentration or electro-chemical gradient

  • must use membrane proteins

  • requires high temperatures

Explanation

Question 16 of 29

1

Fill the blank spaces to complete the text.

is the passive movement of molecules from one location to another, through thermal agitation

Explanation

Question 17 of 29

1

Select from the dropdown list to complete the text.

Diffusion reaches equilibrium over time, and at equilibrium, there is ( no net flux, high flux, no flux, high net flux )

Explanation

Question 18 of 29

1

Which of the following is NOT a factor influencing the rate of simple diffusion?

Select one of the following:

  • concentration gradient

  • distance

  • viscosity

  • saturation

Explanation

Question 19 of 29

1

Fill the blank space to complete the text.

Fick's law equation in words is net flux = (concentration gradient)

Explanation

Question 20 of 29

1

Which two properties of molecules control their ability to permeate a cell membrane?

Select one or more of the following:

  • molecular mass

  • lipid solubility

  • temperature

  • surface area

Explanation

Question 21 of 29

1

Which of the following best defines facilitated diffusion?

Select one of the following:

  • The net movement of substances down their concentration gradient via specific transmembrane proteins

  • The net movement of substances down their concentration gradient

  • The transport of ions through ATP powered ion pumps

  • The transport of substances against their concentration gradient through use of transmembrane proteins and ATP

Explanation

Question 22 of 29

1

Fill the blank space to complete the text.

To transport a molecule via facilitated diffusion, the carrier protein has to bind to it, and only molecules with the appropriate part can fit into the specific binding site and thus be transported; this is known as

Explanation

Question 23 of 29

1

Which of the following is NOT a class of direct or primary active transport mechanisms?

Select one of the following:

  • Ion pumps

  • ABC system

  • Group translocation

  • Antiports

Explanation

Question 24 of 29

1

Select from the dropdown lists to complete the text.

P-class ion pumps are made of ( a single protein, two proteins ) with ( 4, 2 ) trans-membrane subunits

Explanation

Question 25 of 29

1

Fill the blank space to complete the text.

Secondary/coupled active transport involves the accumulating of amino acids and sugars in transport processes which are driven by gradients

Explanation

Question 26 of 29

1

Select from the dropdown lists to complete the text.

The difference between active and passive transport is that active transport ( expends, produces ) energy (usually in the form of ( ATP, ADP, Light ))

Explanation

Question 27 of 29

1

Which of the following regarding membrane proteins is correct?

Select one of the following:

  • Integral membrane proteins are amphipathic

  • Peripheral membrane proteins may span the entire membrane

  • Both peripheral and integral membrane proteins may be able to move laterally in the membrane

  • Integral membrane proteins may help confer cell shape and motility

Explanation

Question 28 of 29

1

One striking feature of plasma membrane structure is its symmetry, with the extracellular and cytoplasmic surfaces virtual mirror images of each other

Select one of the following:

  • True
  • False

Explanation

Question 29 of 29

1

One function of integral membrane proteins in the plasma membrane of cells is to form channels to allow passage of nonpolar solutes into the cell

Select one of the following:

  • True
  • False

Explanation

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