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Biology question a level ocr a

Can someone explain how we would know it’s answer A. What part of the textbook has the structure of these
pathogens?

43A91DFF-4574-474A-906C-FDC47F948DF9.jpeg
(edited 1 year ago)
that pathogen is the structure of a virus, HIV/AIDS is caused by a virus.
Reply 2
Original post by thatethanb
that pathogen is the structure of a virus, HIV/AIDS is caused by a virus.

Yes but what topic is that in OCR A a level biology I don’t recall seeing it in immune system or cell structures. They can’t assume we just happen to know the structure differences? so where is it
(edited 1 year ago)
Reply 3
Original post by Nairbear
Can someone explain how we would know it’s answer A. What part of the textbook has the structure of these
pathogens?

43A91DFF-4574-474A-906C-FDC47F948DF9.jpeg


For your information there are 4 types of viruses including:

1) ssRNA
2) ssDNA
3) dsRNA
4) dsDNA

Here, ss- single stranded , ds- double stranded

In the question the labeling of reverse transcriptase is a hint to point out the answer as HIV because none of the other diseases are caused by retroviruses.

HIV is a ssRNA virus and all these types of viruses are also called retroviruses. Since our body is made of cells having DNA as genetic material, the virus tends to use the enzyme reverse transcriptase (which means opposite to transcription so it doesn't go from DNA --> RNA instead it goes from RNA --> DNA) to produce viral DNA that is capable of then getting incorporated into the host cell (our cells) genome. This process of reverse transcription is called Teminism which was discovered by Howard Martin Temin and David Baltimore in 1978. This theory went against the central dogma of the flow of genetic information proposed by Francis Crick (which was DNA --> RNA --> Protein) and hence came to be known as central dogma reverse. 410F2E96-D2CC-41AA-88B4-1405E80354B8.jpg.jpeg
Reply 4
Original post by Redmed_
For your information there are 4 types of viruses including:

1) ssRNA
2) ssDNA
3) dsRNA
4) dsDNA

Here, ss- single stranded , ds- double stranded

In the question the labeling of reverse transcriptase is a hint to point out the answer as HIV because none of the other diseases are caused by retroviruses.

HIV is a ssRNA virus and all these types of viruses are also called retroviruses. Since our body is made of cells having DNA as genetic material, the virus tends to use the enzyme reverse transcriptase (which means opposite to transcription so it doesn't go from DNA --> RNA instead it goes from RNA --> DNA) to produce viral DNA that is capable of then getting incorporated into the host cell (our cells) genome. This process of reverse transcription is called Teminism which was discovered by Howard Martin Temin and David Baltimore in 1978. This theory went against the central dogma of the flow of genetic information proposed by Francis Crick (which was DNA --> RNA --> Protein) and hence came to be known as central dogma reverse. 410F2E96-D2CC-41AA-88B4-1405E80354B8.jpg.jpeg


thank you for the information. I will read about it. Was very confused since this is an AS paper and reverse transcription is A2 genetic modification. I wasn’t arguing with you I was confused where to find this information for my exam board if it’s not in the specification.
(edited 1 year ago)
Reply 5
Original post by Nairbear
thank you for the information. I will read about it. Was very confused since this is an AS paper and reverse transcription is A2 genetic modification. I wasn’t arguing with you I was confused where to find this information for my exam board if it’s not in the specification.


Yea yea I understand 👍what u say. Sorry it’s just that I didn’t study British curriculum at school so have no idea about ur exam board. I answered based on what I remember had been taught at my school 😁 Anyway hope this helps and good luck with ur exams and further studies!
(edited 1 year ago)

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