Multiple choice

[christoffpow]

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Hey guys, hope you all did well. Found the exam pretty easy to be honest, multiple choice kind of tricky though.

Everyone post your MC answers here, or post any difficult questions you might have had.

[christoffpow]

I got
1. C (mutations generate new alleles, whilst crossing over results in new allele combination. completely different).
2. B
3. B
4. A
5. C
6. C
7. A
8. B
9. C (not sure about this, could be B, discuss)
10. A
11. D
12. C
13. B
14. D
15. D

If you got these answers, then your guaranteed 15/15

[macbeth]

I got most the same except i did 4c, couldn't choose between c and a but i'm pretty sure you're right, and 9c and 13a

[Venom.]

...posted? There's no questions here.

[akim93]

isn;t q10 A?
and q 13 D???

[Liyo]

I got the same, I put B for question 9.
13 i put B at first and changed it to A.
What did everyone else get?

[lolrofllol]

Originally Posted by christoffpow

If you got these answers, then your guaranteed 15/15

heheh, what was your reasoning for 11 anyway? I might be wrong as well. This is what I think:

D shows stomates less than half open during the WHOLE day. Plants can't photosynthesise with stomates half open. B shows them open during half the night (For respiration) and in early morning and dawn (to avoid midday heat but gain sunlight for photosynthesis).

anyway that's what I think

[.euphoriccc.06.]

Originally Posted by christoffpow

I got
1. C (mutations generate new alleles, whilst crossing over results in new allele combination. completely different).
2. B
3. B
4. A
5. C
6. C
7. A
8. B
9. C (not sure about this, could be B, discuss)
10. A
11. D
12. C
13. B
14. D
15. D

If you got these answers, then your guaranteed 15/15

i got the exact answers as this.
9 cannot be B as carbon dioxide is carried in blood as bicarbonate ions in plasma, not attached to haemoglobin

[christoffpow]

Originally Posted by akim93

isn;t q10 A?
and q 13 D???

If you direct your eyes to my original post, you will see i put A for question 10.

And no, 13 is not D, because blood type can't change..

[christoffpow]

Originally Posted by .euphoriccc.06.

i got the exact answers as this.
9 cannot be B as carbon dioxide is carried in blood as bicarbonate ions in plasma, not attached to haemoglobin

Yep

[Liyo]

Originally Posted by .euphoriccc.06.

i got the exact answers as this.
9 cannot be B as carbon dioxide is carried in blood as bicarbonate ions in plasma, not attached to haemoglobin

Hmm...
but I read:
"Most carbon dioxide enters the red blood cells and is combined with water to form bicarbonate ions (HCO3-). Some is attached to haemoglobin molecules in red blood cells and a small percentage is transported in plasma as dissolved CO2."
But I think it might be C now...as it says it binds strongly to haemoglobin. Oh man ><

[christoffpow]

Originally Posted by Liyo

Hmm...
but I read:
"Most carbon dioxide enters the red blood cells and is combined with water to form bicarbonate ions (HCO3-). Some is attached to haemoglobin molecules in red blood cells and a small percentage is transported in plasma as dissolved CO2."
But I think it might be C now...as it says it binds strongly to haemoglobin. Oh man ><

Only 23% of carbon dioxide is attached to haemoglobin. The rest biocarbonate ions/carbonic acid. A compound binding 'strongly' to haemoglobin would be ALOT more than 23%.

[Liyo]

Originally Posted by christoffpow

Only 23% of carbon dioxide is attached to haemoglobin. The rest biocarbonate ions/carbonic acid. A compound binding 'strongly' to haemoglobin would be ALOT more than 23%.

ah stupppidddd meee ! >.<"""""
so it's C then?

[Venom.]

Somebody please scan the multiple choice questions and put it online

[andrewt_ss]

I'm typing up the questions so I may summarise a little as I go

1. How are new alleles formed?

(A) By crossing over during meiosis -i picked this one
(B) By cloning a new variety in a population
(C) By mutation in the DNA of a gene
(D) By production of a new phenotype from the same DNA

2. Which scientists work contributed to our understanding of the causes of infectious diseases?

(A) Frank Macfarlane burnet
(B) Louis Pasteur - I picked this one
(C) James Watson
(D) Maurice Williams

3. Which of the following prevent entry of pathogen into the human body?

(A) Skin and phagocytosis
(B) skin and chemical barriers - i picked this one
(C) Inflammation response and phagocytosis
(D) Inflammation response and chemical barriers

4. The potential for disease to spread through animal populations in intensive farming is heightened because the animals are kept close together

A disease has been identified in animals in one enclosure on the farm.

Which procedure would best prevent the spread of the disease to animals in other enclosures of the farm?

(A) Isolate diseased animals, then vaccinate all healthy
(B) Vaccinate all animals so that healthy do not get disease and spread it further - i picked this
(C) Move the diseased animals into another enclosure to quarantine them from the healthy animals
(D) Wash all animals with antiseptic solution so that the pathogen causing disease cannot spread from diseased animals to healthy animals

5. Why was the importance of Mendel's work not widely accepted until some time after he completed his experiments?

(A) Mendel did not realise the importance of his work - picked this
(B) Mendel did not repeat his experiments so they were not seen as important by other biologists
(C) Mendel published his results in a local scientific publication not accessed by many biologists
(D) Mendel's description of sex linkage to explain his results was not understood by other biologists

6. What is the role of the kidney in mammals?

(A) To remove salt and keep water
(B) To remove water and keep salt
(C) To remove nitrogenous wastes and maintain water levels - picked this
(D) Remove water from the body and maintain nitrogenous waste levels

7. 30% of the nucleotide is adenine

What percentage is guanine in the human DNA?

(A) 20%
(B) 30%
(C) 40%
(D) 70%

8. In humans, brown eye colour is dominant an blue eye is recessive. A brown eted boy and blue eyed girl have a blue eyed mother

What eye colour does the father have and why?

(A) Brown, because brown eye colour is sex linked
(B) Brown, because at least one of the parents must have brown eyes
(C) Blue, because two members have blue eyes
(D) Blue, beacuse at least one parent must be heterozygenous

9. Which alternative best describes what happens to oxygen and CO2 as blood goes through lungs and muscles?
Lungs Muscles
(A) Oxygen dissolves-----------------------CO2 dissolves
(B) Oxygen binds to haemoglobin---------CO2 binds to haemoglobin
(C) Oxygen binds to haemoglobin---------CO2 dissolves
(D) CO2 binds to haemoglobin-------------Oxygen binds to haemoglobin

10. Amylase is an enzyme that catalyses starch. As temperature rises, the activity of enzymes

(A)increase until the enzyme denatures
(B)decrease until substrate denatures
(C)increase until optimum pH (wtf?)
(D)decrease until substrate reaches maximum concentration

11. Experiments were carried out on plants in different environments to measure the size of the leaf stomata at different times of the day.

Which graph best represents a plant in a dry environment?

(A) I'm not bothering to make graphs.
(B)
(C)
(D) totally this answer

12. A student conducted an experiment where CO2 was bubbled in water the student recorded the pH every 5 seconds.
Time_______________pH reading
5----------------------------7.5
10---------------------------7.2
15---------------------------7.0
20---------------------------6.8

What is a valid conclusion?

(A) Change in pH too small to be significant
(B) Water became less acidic
(C) Water more acidic - this one
(D) Change in pH not to do with CO2

13. Why do organ transplant patients need anti-rejection medication?

(A) Minimise infection
(B) Prevent t-lymphocyte growth - this one
(C) Stimulate t-lymphocyte growth
(D) Prevent recipients blood becoming vampirical or something

14. Bunny Rabbits change colour over generation

Is it

(A) Convergent
(B) Divergent - this one
(C) Transitional
(D) Punctuated equilibrium

15. A patient was being treated for an infection with an antibiotic. At seven day intervals a swab was taken from the mouth and cultured onto a fresh agar plate.

Day 1--------------------Day 8 ------------------- Day 15
Mostly grey spots_____half grey/black________mostly black spots


What is the most likely cause of the change in mouth microflora shown in these culture plates?

(A) Species 1 was a food source for Species 2 allowing more Species 2 to grow
(B) Species 1 and Species 2 are both fungi, but Species 1 is killed by the antibiotic and Species 2 uses the antibiotic for food.
(C)As the number of Species 2 increased they changed the chemical conditions of the agar plate stopping the growth of Species 1.
(D) There is normally a balance between the numbers of each species but the removal of Species 1 by the antibiotic allowed more of Species 2 to grow.

MY ANSWERS: (I think all are right except as written)
1.A
2.B
3.B
4.B
5.A (got it wrong should be C)
6.C
7.A
8.B
9.C
10.A
11.D
12.C
13.B
14.B (got it wrong should be D)
15.D