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questions ive got wrong Flashcards

1
Q

in nucleotides, what components contain carbon

A
  • pentose sugar

- nitrogen containing bases

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2
Q

what is the role of cholesterol

A

-binds to phospholipids fatty acid tails, increasing packing of membrane thus reducing the fluidity of the membrane.

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3
Q

why do single celled organisms not need a specialised surface for gaseous exchange

A
  • its a single cell ( has a large sa to vol ratio)

- it has a short diffusion pathway- easy for gasses to diffuse in and out

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4
Q

describe the structure of the plasma membrane

A

-primarily made of phospholipid bilayer that contains proteins. hydropho9bic tails face inwards and hydrophilic heads face outwards. cholesterol bound to fatty acid tails. Extrinsic and intrinsic proteins present. Glycoproteins stick out the bilayer.

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5
Q

why are different enzymes involved in different processes

A

enzymes are SPECIFIC and the substrates have diff shapes. the active site and a substrate have to be complimentary to form ESC.

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6
Q

what forms enzyme product complex

A

destabilizing of bonds

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7
Q

what improves reliability

A

-repeating experiment

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8
Q

explain the induced fit hypothesis

A
  • active site changes shape so a closer fit occurs (more bonds form between active site and and substrate)
  • forms ESC
    • destabilising of bonds forms EPC
  • activation energy reduced
  • active site changes again when product leaves
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9
Q

what is the detailed structure of cells visible with only an electron microscope

A

ultrastructure

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10
Q

what do xylem vessels contain

A

lignin

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11
Q

2 types of cells found in phloem tissue

A

-companion cells and sieve tube elements

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12
Q

how to see amino acids in chromatography

A

spray with ninhydrin

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13
Q

what are the coils of amylose and amylopectin held by?

A

hydrogen bonds

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14
Q

difference in amino acid structure in fibrous and globular

A

fibrous- repetitive amino acid sequence

globular- varied in amino acids- hydrophilic and hydrophobic

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15
Q

what can stem cells be used for

A
  • asexual reproduction
  • growth of organism
  • repair of damaged tissues
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16
Q

whats the point of lignin

A
  • to waterproof the cell which improves adhesion of water
  • strengthens the cell to prevent collapse of xylem
  • ( for some)spiral pattern allows for flexibility
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17
Q

whats the function of bordered pits

A

allow water to move between xylem vessels, lateral flow and allow for supply of water through the plant and to other cells

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18
Q

state 3 roles of membranes inside cells

A
  • cell compartmentalisation
  • provide selective permeability
  • site of attachment for enzymes
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19
Q

whats the term organ

A

more than 1 type of tissue working with many tissues to perform a specific function

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20
Q

what side does the bhor shift cause the sigmoid to move

A

to the right

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21
Q

what allows for the movement of cillia

what structure allows for secretion of mucus

A
  • cytoskeleton

- centriole

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22
Q

how is hydrostatic pressure generated in the heart

A

by the contraction of ventricles

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23
Q

explain why the hydrostatic pressure drops as u move away from the heart

A

as you move away, there are more smaller vessels, the vessels have a larger total lumen. Arteries can also stretch and expand and at the capillaries, there is loss of fluid.

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24
Q

describe how the action of the heart is initiated and coordinated

A

-SAN initiates impulse which is excitation across the atrial walls causing the atria to contract (atrial systole). The impulse is then received at the AVN, delayed then conveyed down the bundle of His into the purkinje fibres which reach along the apex of the heart causing the ventricle to contract bottom upwards

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25
Q

whats a source

A

source= where sucrose and assimilates are loaded into the phloem

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26
Q

whats a sink

A

sink= where sucrose and assimilates are unloaded from the phloem

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27
Q

What thing do plants need if they have a low sa to vol ratio

A

a transport system

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28
Q

what pressure does transpiration produce

A

negative pressure

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29
Q

whats the function of the bordered pits

A

to allow water to move between vessels, can bypass blockage

-also supplies water to other tissues/cells

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30
Q

what do plasmodesmata allow for

A

flow of substances between cytoplasm of diff cells

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31
Q

whats transpiration

A

the evaporation of water from the leaves of a plant

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32
Q

whats the role of elastic fibers during ventilation

A
  • to prevent bursting
  • to allow for recoil
  • returns air sac to its original shape and size to help expel air
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33
Q

how does refreshing of air in the air sacs maintain a diffusion gradient

A

it increases partial pressure of oxygen in the air sacs so conc is higher than that in the blood. It decreases partial pressure of CO2 in the air sac so conc of CO2 in the air sac is lower than that in the blood

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34
Q

in terms of binomial name, what does the 1st part tell us

A

the genus

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35
Q

in terms of binomial name, what does the 2nd part tell us

A

the species

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36
Q

how does histamine stimulate smooth muscle contraction

A

-histamine binds to a receptor on the plasma membrane of a muscle cell which produces a response

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37
Q

Another action of histamine is to make capillary walls more permeable.
Suggest two effects this increased permeability may have on the surrounding tissues

A
  • more tissue fluid is formed
  • oedema occurs
  • more white blood cells can pass into tissues
  • larger molecules pass into the tissue fluid.
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38
Q

tell the difference between the domain system and the 5 kingdom system

A
  • for the domain system, bacteria and archaea are split into two groups because they are different.
  • the domain system is based on differences in DNA
  • domain groups eukaryotes together
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39
Q

give an example of a selection pressure

A
  • a certain environment due to predators, prey/food ability
40
Q

give 2 pieces of evidence that can be used to identify organisms as belonging to two diff species

A
  • different cytochrome C

- different genes

41
Q

how is it possible to confirm that two organisms are different species

A

-interbreed them and if they are able to produce fertile offspring, they are the same species, but if its infertile, they are different species

42
Q

whats continuous evolution and whats discontinuous evolution

A
  • continuous is the effect of many genes and may be due to the effect of the environment
  • discontinuous is the effect of 1 or few genes, it has little/no environmental effect
43
Q

two characteristics of birds share with members of the animal kingdom

A
  • cells have no cell wall

- multicellular

44
Q

domain that a parrot belongs to

A

-eukaryote

45
Q

whats Variation

A

differences in species

46
Q

whats the name of the process where new species arise

A

speciation

47
Q

the system of classifying organisms according to their observable features or genetic characteristics is called

A

taxonomy

48
Q

whats its called whne organisms are classified into large groups then divided into smaller groups

A

hierarchy

49
Q

what is the term used to describe the evolutionary relationships between organisms

A

phylogeny

50
Q

give an example of gaining accurate results in an experiment

A

using more intermediate results

51
Q

give an example of gaining reliable results in an experiment

A

repeat the experiment again

52
Q

outline the process of budding in yeast

A

nucleus divides- cell bulges, nucleus moves into bulge- this gets pinched off

53
Q

describe the function of glycoproteins in the cell surface membrane

A
  • act as antigens
  • recognition of cells
  • receptor/ binding site for proteins
  • cell adhesion to hold cells together.
  • attach to water molecules to stabilise membrane
54
Q

what’s the function of an intrinsic protein/ protein

A

allow communication across membrane OR allow, polar /

charged, particles to pass through membrane

55
Q

what is meant by the term cell signalling

A

communicating between cells to trigger a response.

-cells work together

56
Q

explain how a glycoprotein can act as a receptor

A

it has a specific shape, its complimentary to shape of trigger- trigger attaches to receptor

57
Q

how do polar substances enter a cell

A

through, pore / channel, proteins ;

(using), transport / carrier, proteins- facilitated diff or active transport

58
Q

what’s the cofactor for amylase

A

Cl-

59
Q

whats the prosthetic group for carbonic anhydrase

A

Zn2+

60
Q

brief description of inhalation

A

ribcage moves downwards and outwards: external intercostal muscles contract- diaphragm contracts

61
Q

talk about the pressure in:

  • blood in aorta
  • tissue fluid
  • lymph
  • blood in vena cava
A 
-blood in aorta
high
-tissue fluid
low
-lymph
low
-blood in vena cava
low
62
Q

why is it bad that endangered populations are scattered and isolated from each other

A
  • as isolated, there may not be substantial numbers to breed so fertile offspring cant be produced.
    inbreeding also may occur so small gene pool- could all be wiped out by the same disease- also more vulnerable to poachers and predators
63
Q

how can zoos contribute to the conservation of endangered species

A

-by giving education and awareness to people

64
Q

why do viruses not replicate in red blood cells

A
  • as erythrocytes dont contain RER for protein synthesis and the virus is unable to replicate on its own
65
Q

why does plasmodium enter RBCS

A

uses it to hide from the immune system

66
Q

why do erythrocytes not make use of the oxygen they are transporting

A

oxygen is bound to haemoglobin- they lack mitochondria so no aerobic respiration and dont need ATP to move as they have mass flow

67
Q

explain why the blood offloads more oxygen to actively respiring tissues than to resting ones

A
  • active tissues have a high amount of co2 present.
  • high co2 results in lowered affinity for haemoglobin for oxygen. co2 results in dissociation of carbonic acid/ increase of H+ leading to the releasing of oxygen.
68
Q

explain how mass flow occurs

A
  • sucrose and assimilates are in the sieve tube elements.
  • assimilates enter the sieve tube at source and lowers the water potential.
  • water enters the sieve tube by osmosis and increases hydrostatic pressure
  • assimilates then leave the sink increasing water potential.
  • water then leaves the sieve tube by osmosis and lowers hydrostatic pressure
  • assimilates move from a high to low hydrostatic pressure down a concentration grad
69
Q

describe how the stomata is adapted to its role

A
  • unevenly thickened cell wall
  • able to change shape/ bend
  • transport proteins in pm
  • mitochondria to provide atp
70
Q

use the cohesion tension theory to describe how water moves from roots to leaves

A

evaporation at the top of a plant creates tension in the xylem, water molecules stick together/ are cohesive and the chain is pulled up by tension

71
Q

what 2 assimilates are loaded into the sieve tube element

A

sucrose and amino acids

72
Q

what would u see in companion cells using an electron microscope

A
  • many mitochondria

- plasmodesmata between companion cell and sieve tube

73
Q

transpiration

A

the loss of water vapour from aerial parts of a plant

74
Q

transpiration stream

A

movement of water (up xylem vessels) from roots to surrounding tissues

75
Q

what happens to hydrostatic pressure in plant at a low temp

A

active trasnport requires atp,
at low temps, little kinetic energy thus less respiration/ atp so less loading sugars into sieve tube element, low hydrostatic pressure created

76
Q

what does the release of hydrogen ions cause in rbcs

A

fall in pH, which reduces haemoglobins affinity for oxygen

77
Q

elements in cholesterol

A

C, H , O

78
Q

elements in insulin

A

C, H, O , N ,S

79
Q

elements in ATP

A

C, H, O, N, P

80
Q

1 Property of water making it an ideal habitat for animals

A

high specific heat capacity so can easily maintain temp

81
Q

what can students do to ensure they have confidence in their results

A
  • repeat experiment multiple times
  • calculate the mean
  • identify anomalies
82
Q

why do large organisms need a circulatory system

A

-large organisms have a large sa to vol ratio, rate of diffusion= too slow and not sufficient enough for metabolic demands and sufficient removal of waste products

83
Q

why does melting point decrease as saturation decreases

A

less saturated= more kinked (more c=c bonds) so less uniformly packed so lower temp needed

84
Q

whats the bond between a pentose sugar and a phosphate called

A

a phosphodiester bond

85
Q

two similarities and two differences between the DNA nucleotide (phosphate, deoxyribose, adenine )and ATP

A

similarities:
- both have a pentose sugar
-both contain adenine
-both contain a phosphodiester bond.
differences:
-ATP contains 3 phosphate groups instead of one
-deoxyribose in DNA nucleotide is replaced by ribose in ATP

86
Q

how do hairs reduce transpiration rate

A

hairs trap water vapour so reduce water loss

87
Q

what are tissues

A

a group of cells that are specialised and working together

88
Q

what are homologous chromosomes

A

made up of:

  • one maternal and one paternal copy
  • carry the same genes
  • carry different alleles
  • have the same banding pattern
  • are the same length
  • centromere is in the same place
89
Q

Name two parts of a plant where meristematic tissue can be found.

A

apex of root
apex of shoot
bud

90
Q

State one way in which the products of meiosis are different from the products of nuclear
division in meristematic tissue.

A

meiosis= daughter cells are haploid
=the resulting cells are called gametes
=4 cells are produced
=the 4 cells are genetically different

91
Q

describe the secondary structure of collagen

A

a left handed helix

92
Q

a-glucose + a-glucose

A

maltose

93
Q

what type of immunity is provided by vaccination

A

active artificial

94
Q

how does viral RNA from a virus cause viral protein to be produced

A

the viral RNA acts as MRNA and carries the code for the viral protein to the ribosome

95
Q

explain why a mutation in viral RNA leads to a change in 3-d shape of a protein antigen

A
  • diff sequence of amino acids is made
  • quaternary (3d) structure affected by change of amino acids as it alters ionic and hydrogen, hydrophilic and hydrophobic.
96
Q

describe what t-killer does

A

cytotoxic, releases toxic substances to kill infected cells

bio (29 decks)

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