Multiple Choice (3 Viewers)

[mel.89]

i put A for Q14....if your dehydrated the last thing you wants is more salt..... well thats my reasoning anyway

 

[Pyros89]

Hi,

Well im glad the test is over .

My multiple choice responses were basically the same as people's here, I think 14 is C.

My reasoning:

ADH is desigined to allow more water back into the blood.

Aldosterone increases the reabosorption of salts into the blood, and then increases water via osmosis.

Im fairly sure its C, but i might be wrong , hope not though!!

 

[shona1990]

Oooh, big debate over 14! Hehe
I put C. Seemed right, still does, but i'm not gonna go over my notes trying to find out why, or argue my point. I don't care anymore, IT'S OVER!!!!

I seemed to put pretty much what most people have. The multiple choice was so easy!

 

[integrity012]

ISN'T QUESTION FIVE D??

because the results are dependent on what you do to the samples.. that is... treating tehm by boiling and adding pool chlorine...

 

[tmde1st]

ADH is responsible for increasing the permeablity of the collecting ducts of the nephron in absorbing water..so ADH increases for sure

aldosterone increases the reabsorption of salts, hwoever, salts as in the absoroption of sodium ions and getting rid of potassium, and sodium ions is responsible for water retention. so if he was to dehydrate, he would need to have an increase in aldosterone to retain the water he currently has and increase water concentrations with more adh, so they work hand in hand, also addisons disease is the disruption of the adrenal cortex, which means not enough aldosterone is produced and a consequence of the addisons disease is severe dehydration so.... yeah thast what i believe

Thats what i thought.

 

[kobina]

the person just ran a marathon, im pretty sure their is no one that doesn't sweat after running a marathon. it is true that aldosterone acts on increaseing sodium reabsorbtion, but this is too maintain blood pressure. someone who is dehydrated will hjave low bp and the increased reabsorbtion of sodium causes an increase in water osmosi, thus increaseing bp

when ur dehydrated its specifically talking about water. ok ill tackle this from another perspective

dehydration=need for more water. if u also increase salts there will be osmosis of water into the bloodstream, thus further dehydration of cells WHERE THE WATER IS NEEDED.

anyways dont worry. knowin board of studies theyll come up with a way to make the ansa B or D lol

 

[Anonymous1]

1 - D
2 - B
3 - A
4 - A (This is definately wrong, the answer is C)
5 - B
6 - B
7 - D
8 - D
9 - D
10 - A
11 - A (I am unconvinced this is B, nor am I convinced this is A - lol..)
12 - D (mmm... could be A - but I'm sure I rememebr reading something to suggest it was D - But hey, it's just a gut feeling. Could be wrong...)
13 - C
14 - C (I'm pretty sure it is C, but not 100% sure so could be A)
15 - D

 

[elliegow]

I am almost certain Question 1 was (A).


I dont know the exact question...
But I think it asked which was the substrate

All the other pictures were either the enzyme or the enzyme and the subtrate together, (A) was the only one with just a substrate.

Or I could be completely wrong!



Did anyone else find the test ridiculously easy? ...stoked! XD

 

[fartx2]

d
b
a
c
b
b
d
d
d
a
b
a
c
a
d

 

[elliegow]

from the "exam thoughts" thread

alright, here they are...you better appreciate it coz i typed it all up...lol

Q 1) the diagram shows one example of enzyme action as demonstrated by the 'Lock and Key' model.
Which part of the diagram represents the substrate?

(A) C
(B) ACB
(C) AB
(D) A B
(use your imagination to remember the picture)

Q 2) why do cells contain many different enzymes?

(A) Enzymes are timperature specific
(B) Enzymes are specific in their action
(C) Enzymes are sensitive to pH changes
(D) Enzymes are sensitive to substrate concentration

Q 3) This is a longitudinal section of a plant stem (x 200)
What is the name and function of the tissure labelled W?

(A) Xylem- Transports water and mineral ions
(B) Phloem- Transports water and mineral ions
(C) Xylem - Transports simple sugars
(D) Phloem - Transports simple sugars

Q4 ) The Wollemi Pine is easily killed by the fungus which lives in the soil. The last small population of Wollemi Pines grows in a remote part of a national park in NSW. Scientists studying this natural population use strategies to prevent the trees becoming infected.
Which procedure would be most effective in preventing the spread of this fungus to the Wollemi Pines?

(A) Inspecting soil smaples in the area
(B) Commercially producing and distributing the Wollemi Pine
(C) Washing soil from the scientists' shoes before they walk in the area
(D) Preventing the importation of infected Wollemi Pines into Australia

Q 5) Students performed an investigation to compare the effectiveness of two water treatments for purifying pond water.
Three samples of pond water, A, B and C, were collected and each used to inoculate the agar plates. The plates were incubated at 25 degrees and examined 3 days later. The number of visible bacterial colonies on each plate was counted an dthe result tabulated.
What is the dependent variablein this investigation?

(A) the use of a control sample
(B) the number of visible bacterial colonies
(C) the use of sterile agar plates for each sample
(D) treating the water by boiling or adding pool chlorine.

Q 6) Which biological term is best described by 'engulfing and destruction of bacteria or other foreign bodies'?

(A) vaccination
(B) phagocytosis
(C) antibody production
(D) an inflammation response

Q 7) Which leaf structures are adaptations to assist in the conservation of water?

(A) central vein, irregular leaf shape
(B) large air spaces, pointed leaf tip
(C) spongy mesophyll, vascular bundle
(D) sunken stomates, thick waxy cuticle

Q8) Which observation can be used to demonstrate Koch's contribution to understanding the cause of disease?

(A) polio vaccinations trigger an immune response
(B) some mosquitoes carry a pathogen that is often fatal to people
(C) a lack of vitamin C is found in all people suffering the nutritional disease scurvy
(D) the bacteria, Heliobacter pylori, is present in the stomach of all diagnosed with stomach ulcers.

Q 9) Current reproductive techniques can be used to alter the genetic composition of a population. Some of these methods were also used in the nineteenth century by Gregor Mendel.
How did Mendel use reproductive techniques in his experiments?

(A) he artificially inseminated the pea kplants to achieve wrinkled seeds
(B) he cloned the pea plants with round seeds to increase their food supply
(C) he created a transgenic species by mixing tall pea plants and short pea plants
(D) he artificialy pollinated the pea plants to test for different genotypes in the offspring

Q10) Which statement best describes the relationship between proteins and polypeptides?

(A) proteins are composed of polypeptides
(B) polypeptides are composed of proteins
(C) proteins, unlike polypeptides, are composed of amino acids
(D) polypeptides, unlike proteins, are composed of amino acids

Q11) The family tree shows the inheritance of a genetic characteristic.
What is the probability that a daugter of parents A and B would be affected?

(A) 0%
(B) 25%
(C) 50%
(D) 100%
(use your memory to picture the diagram..)

Q12) Which flowchart correctly shows an interaction betwen B and T lymphocytes during an immune response?

(A) infection --> T cells recognise antigen as foreign --> B cells stimulated and antibodes produced
(B) infection --> B cells recognise antigen as foreign --> T cells stimulated and antibodies produced
(C) infection --> T cells stimulated and antibodies produced & B cells recognise antigen as foreign
(D) infection --->B cells stimulated and antibodes produced & T cells recognise antigen as foreign

Q13) The effectiveness of new insecticide was tested on a large population of mosquitoes over a number of breeding cycles. At first the population of mosquitoes was reduced dramatically by the use of the insecticide. after a number of breeding cycles the population then began to increase until the insecticide appeared to have little effect.
How would the Darwin/ Wallace theory of evolution by natural selection explain these observations?

(A) some of the original population were isolated from the insecticide as a control group
(B) some of the original population had already reproduced before the insecticide was used
(C) some of the original population were resistant to the insecticide and passed this on to their offspring
(D) some of the original population adapted to the insecticide and survived to produce offspring


Q14) At the end of a marathon race a runner's body is dehydrated.
How does the body control the two hormoes, ADH and aldosterone, to help to re-establish normal water balance?

(A) ADH is released and aldosterone is inhibited
(B) ADH is inhibited and aldosterone is released
(C) both ADH and aldosterone are released
(D) both ADH and aldosterone are inhibited

Q15) How have Walter Sutton and Theodor Boveri contributed to the understanding of inheritance?

(A) by determining the structure of DNA
(B) by improving knowledge of sex linkage
(C) by demonstrating teh effect of environment on phenotype
(D) by identifying the importance of chromosomes in inheritance

hoca pontis = awesome.

 

[sslions]

I am almost certain Question 1 was (A).


I dont know the exact question...
But I think it asked which was the substrate

All the other pictures were either the enzyme or the enzyme and the subtrate together, (A) was the only one with just a substrate.

Or I could be completely wrong!



Did anyone else find the test ridiculously easy? ...stoked! XD

Nope, question 1 is definitely not (A); its (D). An enzyme is defined as a catalyst which aids in speeding the process BUT it doesn't take part in the reaction. Molecule C is the enzyme because it brings subtrates "A and B" together, to form a product AB. Then, molecule C leaves the productAB to catalayse other reactions. Molecule C didn't take part in the reaction, thus it can't be the substrate. A and B are the substrates

 

[Anonymous1]

elliegow:
I am almost certain Question 1 was (A).

I dont know the exact question...
But I think it asked which was the substrate

All the other pictures were either the enzyme or the enzyme and the subtrate together, (A) was the only one with just a substrate.

Or I could be completely wrong!

-----

The question was designed to trick you. C is definately the enzyme, the key here is that it remained 'unchanged' during the reaction. The middle image depicte the enzyme - substrate complex, so B can not be correct. Since C is the enzyme, and it is asking for the substrate, A is also incorrect. This leaves you with C & D. The final image in the diagram depicts the products from the reaction, so C is incorrect. Through the process of elimination to the answer is definately D.

The question didn't require that much thought though, it just required you to 'apply' your knowledge to the question - it was fairly simple.

 

[Stipe Pletikosa]

Question 1 i sofficialy C

As extracted from a key source:
'The Products are the substances that the Substrate(s) become. One substrate can be split, or two substrates can be joined'

In this case it was 2 substrates joining. You cant just ignore the arrows in the diagram! They showed the flow of the reaction.

 

[Stipe Pletikosa]

Question 1 is officialy C

As extracted from a key source:
'The Products are the substances that the Substrate(s) become. One substrate can be split, or two substrates can be joined'

In this case it was 2 substrates joining. You cant just ignore the arrows in the diagram! They showed the flow of the reaction.

 

[elliegow]

haha! looks like i fell for an easy trick

 

[sslions]

Question 1 is officialy C

As extracted from a key source:
'The Products are the substances that the Substrate(s) become. One substrate can be split, or two substrates can be joined'

In this case it was 2 substrates joining. You cant just ignore the arrows in the diagram! They showed the flow of the reaction.

lol, you just contradicted yourself. In this key source, it said products are the substances that the substrates become; meaning, that the substrates 'can be joined' to become the product. Therefore, AB are the products which the substrates become, thus (C) is wrong since (C) shows the products; therefore A and B have to be the substrates; thus (D) is the correct answer.

 

[mithril1337]

Q 9) Current reproductive techniques can be used to alter the genetic composition of a population. Some of these methods were also used in the nineteenth century by Gregor Mendel.
How did Mendel use reproductive techniques in his experiments?

(A) he artificially inseminated the pea plants to achieve wrinkled seeds
(B) he cloned the pea plants with round seeds to increase their food supply
(C) he created a transgenic species by mixing tall pea plants and short pea plants
(D) he artificialy pollinated the pea plants to test for different genotypes in the offspring (credit to hoca pontis)

D states 'he artificialy pollinated the pea plants to test for different genotypes in the offspring' Mendel wasn't testing for 'genotypes.'

there for A is the correct answer since the statement is true.


Lols please disprove me this is what a friend said.....

 

[Stipe Pletikosa]

lol, you just contradicted yourself. In this key source, it said products are the substances that the substrates become; meaning, that the substrates 'can be joined' to become the product. Therefore, AB are the products which the substrates become, thus (C) is wrong since (C) shows the products; therefore A and B have to be the substrates; thus (D) is the correct answer.

What are you talking about.

The reactiong that took place was AB splitting to become two sepearte products of A and B

The enzyme was labeled and the Substrate was AB

The reaction took place and produced the products AB you half wit.

Therefore when the question asks 'What is the substrate' the answer is AB = C

 

[joshuaali]

You don't inseminate a plant. Heck, plants don't even produce semen, nor are there genders for plants.

 

[fartx2]

there for A is the correct answer since the statement is true.


Lols please disprove me this is what a friend said.....

holy cow i think youre right

dammit.