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Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

5 · The Mitotic Cell Cycle

0/21

6 · Nucleic Acids and Protein Synthesis

0/22

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

9 · Gas Exchange

0/13

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/34

17-18 · Selection, Evolution, Classification and Conservation

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19 · Genetic Technology

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Quiz

2.2.8 Phospholipids – Exam questions

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  • Questions count: 13
  • Passing grade: B+
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1.
According to the comparison table in this lesson, what is the Function of Phospholipids?
According to the comparison table in this lesson, what is the Function of Phospholipids?
Membrane components
Recognition
Transport, signalling
Enzymes, anchors
Barrier
2.
According to the comparison table in this lesson, what is the Structure of Phospholipid?
According to the comparison table in this lesson, what is the Structure of Phospholipid?
Biological molecules compared
Straight chains, H-bonds → microfibrils
Branched (glycogen more)
Unbranched helix
Hydrophilic head, hydrophobic tails
3.
Which molecule crosses the phospholipid bilayer most easily?
Glucose
Oxygen
Sodium ion
A protein
4.
Which statement best describes Phospholipid?
A polar phosphate head and two non-polar fatty acid tails in one molecule.
Protein or lipid with a sugar chain — cell recognition and identity markers.
A protein that binds a specific signal molecule and triggers a response inside.
Having both a water-loving and a water-hating region — the key property of a phospholipid.
5.
In the phospholipid diagram, which part is hydrophobic?
Dr Dabour Hub Academy - figure 1
B, the fatty acid tails
A, the phosphate head
Both A and B equally
Neither part
6.
The phospholipid bilayer forms spontaneously in water without energy input. True or false?
True
False
False, it needs ATP
True only in cells
7.
The part of a phospholipid that is hydrophilic is the
fatty acid tails
phosphate head
C=C bonds
whole molecule
8.
Phospholipids form bilayers in water because they
are entirely hydrophobic
have hydrophilic heads and hydrophobic tails
are made of amino acids
form peptide bonds with water
9.
Which molecule can diffuse directly through the phospholipid bilayer most easily?
Glucose
Na+ ion
Oxygen
A protein
10.
Which molecule crosses a phospholipid bilayer most readily by simple diffusion?
Glucose
Na+
O2
Proteins
11.
What happens to membrane fluidity if phospholipids contain more unsaturated fatty acids?
It decreases
It increases
No change
The membrane solidifies
12.

Phospholipids form a bilayer because

heads repel water
tails are attracted to water
they are joined by covalent bonds
hydrophilic heads face water and hydrophobic tails face inwards
13.

Phospholipids differ from triglycerides in having

three fatty acids
no glycerol
a phosphate group in place of one fatty acid
no fatty acids
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Part of 2 · Biological Molecules — see every lesson and quiz in this unit.
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