Movements of Ions and Molecules Flashcards

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1
Q

In a phospholipid, what bone forms a kink in the chain?

A

A cis bond

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2
Q

What is the name for the concept that a phospholipid has hydrophilic and hydrophobic components?

A

Amiphiphatic

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3
Q

During endocytosis, what part of the membrane must interact in order for something to be taken into a cell in a vesicle?

A

The phospholipid heads

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4
Q

What specifically about a charged molecule stops it from passing through the bilayer?

A

It has a shell of water around it so will not get through the hydrophobic part of the membrane.

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5
Q

What is evidence for the sodium - potassium pump?

A
  • Tracer studies with radioactive isotopes
  • Sodium and ATP must be outside and potassium inside
  • Metabolic poisons block the pump
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6
Q

What does an ATPase enzyme do?

A

Hydrolyses ATP

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7
Q

How are symporters and antiporters different?

A

Symporters transport molecules in the same direction across the membrane and antiporters transport them in different ways

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