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B > Jun 2016 Unit 2 > Flashcards

Jun 2016 Unit 2 Flashcards

1
Q

Explain what is meant by a phylogenetic group.

A

(Grouped according to) evolutionary links/ history/ relationships / common ancestry

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2
Q

What is meant by species?

A
  1. Able to reproduce;
  2. To produce fertile
    offspring;
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3
Q

Explain what the information in Table 2 suggests about the phylogenetic relationships between these tigers.

A
  1. South China and Sumatran tigers share a more recent
    common ancestor;
  2. (because) identical/same/matching (nucleotide) sequences;
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4
Q

What term is used to describe the structure of a protein made of two or more polypeptides?

A

Quaternary (structure)

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5
Q

Describe the role of haemoglobin in supplying oxygen to the tissues of the body

A
  1. Oxyhaemoglobin formed/ haemoglobin is loaded/
    uptakes/associates/binds with oxygen in area of higher ppO2 / in gas exchange surface/lungs/gills;
  2. (oxygen) unloaded/dissociates from/released (in area of lower ppO2 / in capillaries/to cells/tissues)
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6
Q

Explain the advantage to a person with anaemia of the change shown in the oxygen dissociation curve

A
  1. (Anaemia curve shifted to right) haemoglobin has lower affinity for oxygen / binds less tightly;
  2. releases more oxygen / oxygen is released quicker / oxygen dissociates/ unloads more readily to muscles/tissues/cells;
  3. (For) respiration;
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7
Q

What is meant by species diversity?

A

Number of species in a ecosystem

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8
Q

Give two pieces of information needed to calculate an index of diversity for a community.

A
  1. Number of (organisms of) each species;

2. Total number of organisms (of all species) / Total number of species;

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9
Q

A scientist investigated the effect sewage entering a river had on the distribution of organisms living in the river. Where sewage entered the river, he found a high density of organisms but a low index of diversity.
Suggest how sewage entering the river could explain the scientist’s findings.

A
  1. Described effect of sewage (eg oxygen depletion/is toxic/kills);
  2. Prevents some/many species colonising/ reproducing/remaining;
  3. Sewage is food source for (individuals of) some/a few/species;
  4. (So) increase only in their numbers;
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10
Q

Explain how the second set of results affects the ability of the scientists to make any conclusions about the effect of sewage on the index of diversity.

A
  1. Results are not repeatable / are not representative / unreliable / conflict / contradict;
  2. Can’t make any conclusions;
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11
Q

Suggest the additional steps that should be taken by the scientists before they are able to make any conclusions about the effect of sewage entering this river

A

Do repeats to find a pattern

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12
Q

Name the structure through which gases enter and leave the body of an insect.

A

Spiracle

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13
Q

Name the small tubes that carry gases directly to and from the cells of an insect.

A

Tracheoles

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14
Q

Explain the movement of oxygen into the gas exchange system of an insect when it is at rest.

A
  1. Oxygen used in (aerobic) respiration;
  2. (so) oxygen (concentration) gradient (established);
  3. (so) oxygen diffuses in
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15
Q

A scientist investigated the effect of abdominal pumping on the pressure in the tubes
and the volume of carbon dioxide released by the insect.Figure 3 shows his results.

Describe and explain these results.

A
  1. Abdominal pumping/pressure in tubes linked to carbon dioxide release;
  2. (Abdominal) pumping raises pressure in body;
  3. Air/carbon dioxide pushed out of body /air/carbon dioxide moves down pressure gradient (to atmosphere);
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16
Q

Describe and explain the appearance of chromosome K in cell C.

A
  1. (Chromosomes consist of) two chromatids connected at centromere;
  2. (Because) DNA has replicated;
17
Q

Explain what is happening at point J in cell B.

A
  1. Crossing over / exchange of alleles /lengths of DNA / recombination;
  2. Between (chromatids of) homologous chromosomes
18
Q

Use information from all three cells in Figure 4 to explain how the number of chromosomes in cell D was produced.

A
  1. Separation/segregation of pairs/homologous chromosomes;
19
Q

Explain why some cells contain a mass of DNA between 1 and 2 arbitrary units.

A

(DNA) replication taking place/not finished

20
Q

Describe how temporary mounts of leaves are made.

A
  1. Thin slice/section;

2. Put on slide in water / solution / stain

21
Q

Describe how the scientist could have used the temporary mounts of leaves to determine the mean number of chloroplasts in mesophyll cells of a leaf.

A
  1. Select large number of cells / select cells at random;
  2. Count number of chloroplasts;
  3. Divide number of chloroplasts by number of cells
22
Q

There are many different types of cell in a leaf, each with its own function.
What term is used to describe a structure such as a leaf?

A

organ

23
Q

What is the name of a position of a gene on a chromosome?

A

Locus

24
Q

What is meant by genetic diversity?

A

Differences in DNA

25
Q

What do these data show about the differences in genetic diversity between these breeds of dog?

A
  1. Jack Russell (genetic) diversity is (significantly) greatest;
  2. Bull terrier (genetic) diversity is (significantly) smallest / is most inbred;
  3. Miniature terrier and Airedale terriers are similar;
  4. Standard deviations do not overlap
26
Q

Miniature terriers were first bred from bull terriers in the 19th century.
Suggest one explanation for the observed difference in genetic diversity between
miniature terriers and bull terriers.

A
  1. (Bull terrier) breeding has included a genetic bottleneck/ small population/more inbreeding/ greater
    selection (pressure);
  2. Reduced number of different alleles/size of gene pool;
27
Q

The sport scientists concluded that the three types of meal had no major effect on maximum percentage increase in blood flow in the mesenteric artery.
What else can be concluded from their results?

A
  1. Time taken to reach maximum blood flow varied widely/significantly;
  2. Quickest after a carbohydrate-only meal;
28
Q

Suggest the advantage of the change in blood flow in the mesenteric artery during exercise.

A
  1. More blood flows to (skeletal) muscles (during exercise);
  2. (supplying) more oxygen / glucose / removing more carbon dioxide/ lactic acid/ heat;
  3. Prevents anaerobic respiration and build up of lactic acid
29
Q

The sport scientists concluded people should not do vigorous exercise after a meal.
Does the information from Table 5 and Figure 7 support this conclusion?

A

Immediate effect of exercise after meal
1. Meal increases blood flow in (mesenteric) artery AND exercise decreases blood flow in (mesenteric)
artery;
Overall effect on blood circulation
2. Insufficient blood (flow to small intestines / muscles);
Effect on blood flow of type of meal
3. Carbohydrate meal quick(er) / during exercise;
Effect of reduced blood flow on cells
4. (More) anaerobic (respiration) / lactic acid produced;
Consequence for person of changed blood flow
5. Less absorption (of digested food) /

30
Q

Blood leaving the kidney eventually returns to the kidney.

Describe the pattern of blood circulation in a mammal that causes blood to return to the kidney.

A
  1. (blood flows from kidney along) renal vein to vena cava;
  2. (along) vena cava to right atrium/side of heart;
  3. (along) pulmonary artery to lungs;
  4. (along) capillaries to pulmonary vein;
  5. (along) pulmonary vein to left atrium/side of heart;
  6. (along) aorta to renal artery (to kidney);
  7. Blood may pass through several complete circuits before returning to kidney;
31
Q

Suggest two hypotheses the scientists were testing in this investigation.

A
  1. Type of feed affects (antibiotic) resistant bacteria (in animals);
  2. (Antibiotic) resistant bacteria infect /are passed on to animals/farmer / resistant bacteria are passed between animals;

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