Qualification > Sciences

AS Biology Question

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kratos009:
Thanks a lot. I think i understand how it works now. I still don't understand the mechanism of the hydrolysis so I would really appreciate it if you could find a link.

nid404:
I'm lookin for  video tutorial cuz it explains best

kratos009:
Hey guys,

1. Which agricultural practice will not provide an alternative to the use of ammonium nitrate as a
fertiliser to increase the productivity of wheat?
A growing wheat and another cereal crop in the same field in alternate years
B wheat and another cereal crop in the same field in alternate years
C ploughing animal waste such as dung into the soil
D using synthetic urea as a fertiliser

the answer was A. These type of questions come up occasionally in Biology multi-choice questions. I don't really understand how growing wheat and beans in the same field in alternate years provides an alternative source of ammonium nitrate. And i also don't really understand what is the difference between growing wheat and another cereal crop in the same field in alternate years and wheat and another cereal crop in the same field in alternate years. Could someone explain to me why one provides an alternative source of ammonium while the other doesn't? ???

2. Which function can be carried out by a mature red blood cell?

A active transport
B cell division
C phagocytosis
D protein synthesis

The answer was A. i was wondering how does red blood cell do active transport wehn hardly any organelles are present with the red blood cell. Wouldn't the red blood cell require lots of energy and thus require lots of mitochondria to be present? And even if it does do active transport which material does it use active transport on?

3. Some soil-borne fungi cause wilting in crop plants by growing within the xylem vessels.
Which process will be directly affected by these fungi?

A conduction in the apoplast
B development of root pressure
C stomatal movement
D uptake of water by root hairs

The answer was A. What do they mean by conduction of the apoplast? I thought the apoplast way was when the water travels through the cell walls so how does the fungi growing within the xylem vessel affect this apoplast process? And i thought that answer B would make more sense because wouldn't the growth of the fungi increase the resistance against water movement, therefore affecting the hydrostatic pressure between the roots and the leaf, and therefore the movement of the water would be restricted? ???

Thanks a lot. ;D

nid404:
check the first question again....check f there's a typo....the A & B option are the same

for the second one yes the RBC can carry out active transport..most eukaryotic cells have sodium pumps......i think the sodium pumps are discussed later ahead...i don't know whether the syllabus asks for that funtion...

Apoplast is the pathway through cell wall...when fungi form in the xylem, the side walls will get obstructed...hence conduction through apoplast will suffer

kratos009:
Oh right thanks i understand the second and third question now. Yeah sorry there was a typo it should be:

1. Which agricultural practice will not provide an alternative to the use of ammonium nitrate as a
fertiliser to increase the productivity of wheat?
A growing wheat and another cereal crop in the same field in alternate years
B growing wheat and beans in the same field in alternate years
C ploughing animal waste such as dung into the soil
D using synthetic urea as a fertiliser

the answer was A. These type of questions come up occasionally in Biology multi-choice questions. I don't really understand how growing wheat and beans in the same field in alternate years provides an alternative source of ammonium nitrate. And i also don't really understand what is the difference between growing wheat and another cereal crop in the same field in alternate years and wheat and another cereal crop in the same field in alternate years. Could someone explain to me why one provides an alternative source of ammonium while the other doesn't? Huh?

Some further Biology questions :).

1. Which enzyme rejoins sections of DNA in genetic engineering?

A DNA ligase
B DNA polymerase
C restriction enzyme
D reverse transcriptase

The answer was A. I was just wondering what happens to DNA polymerase after it links the sugar-phosphate group of the activated nucleotide  to the original backbone of the DNA. I'm not exactly sure what DNA ligase is used for and how it rejoins the DNA, could someone explain, Thanks.

2. What is the main effect of heroin on the body?

A It affects metabolic processes in the liver.
B It causes over reaction in muscles.
C It mimics natural neurotransmitters.
D It stimulates reflex pathways through the spinal cord.

The answer was C. I don't think i've covered the effects of heroin in my syllabus. Could someone explain what it means by 'mimics natural neurotransmitters.' thanks a lot.

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