AQA Biology B1 Higher - Unofficial Mark Scheme

DanBing

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Unofficial Mark Scheme!
Post any questions you remember and I'll compile the answers into an unofficial mark scheme!

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- Thalidomide can now be used to treat leprosy.
- A pathogen is a micro-organism that causes disease.
- Drugs are trialed to check dosage or check if they work.
- Drugs are addictive because, as they change chemical processes, the patient suffers withdrawl symptoms.
- The process that plants and algae carry out is photosynthesis.
- The carbon in the atmosphere is changing, as there is more being added to the atmosphere than there is being removed.
- Control variables were lawn size, volume of weed killer etc.
- The 0 result acts as a control for comparison.
- The percentage change in goldfinches was 60.3.
- Skin receptors detect heat, pressure and pain.
- Oestrogen is produced in the ovary & thickens the womb lining.
- The part of the cell that controls the enzyme reaction is the nucleus.
- Optimum temperature for industrial bacteria growth is 40°c.
- Effectors are the muscles (contracts) and the glands (secretes hormones).
- A gene is a section of DNA which controls characteristics.
- Total of Carbon released from respiration is 140 billion tonnes.
- The minimum time for drug development is 6 years.
- The range of people in the drug test is 50 to 6000 or 5950.
- Bladder Wraks grew faster as the air bladders allowed them to float, compete for light & photosynthesize.

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Auxin

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Thalidomide was found to treat Leprosy (accept cancers)
140 billion
NO PARTICULAR ORDER

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annabelsw

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if this is gcse- question1 was; what is ONE other thing thalidomide can now be used to treat?

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Avocado2002

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Thalidomide is now used to treat leprosy.

The two types of effectors are muscles and glands. Muscles contract, glands secrete hormones.

Control variables for the weedkiller question: area of lawn used (10m2), time tested for (2 weeks).

A pathogen is a microorganism that causes infectious disease.

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izzy_lm

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What is a pathogen?
pathogen is something that causes disease by invading cells

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Banana00

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(Original post by izzy_lm)
What is a pathogen?
pathogen is something that causes disease by invading cells

does disease-causing microorganisms count?

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milly30

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gene- contains genetic information that controls your characteristics

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Al_YG

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For stating 3 reasons why the graph for the birds could be wrong is:
the date of the investigation was january 2011, a long time ago
the time of day the people investigated it was in 1 hours of the day
i forogt the third one

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Al_YG

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a pathogen is a microorganism that causes infectious disease

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Al_YG

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the 25c 40c and 100c question was 40 degrees

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Gunjo

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(Original post by milly30)
gene- contains genetic information that controls your characteristics

Gene - Section of DNA, Located on the chromosome in the nucleus of the cell.

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Gunjo

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Gland - Secrete Hormones
Muscle - Contracts

The disease was leprosy
The part of the cell was Ribosome

Fish having light meant Could attract prey/Be able to see in general
Plant was adapter as Air bubbles meant it was able to float more, reach light and photosynthesise, causing it to grow

Maths Question was to increase 30 (approx) by 80% (1.80 x 30) - the answer was 60.3 (Can't remember exact number but was somewhere around 30)
Oestrogen now used to decrease fertility (Oral Contraceptive)

Please Credit me

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Adam998

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(Original post by milly30)
gene- contains genetic information that controls your characteristics

Genes are sections of Dna that code for a specific protein which develops the hereditary features:P

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Avocado2002

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(Original post by izzy_lm)
for the 6 marker I wrote this but I don't know if it is correct.
auxin is the plant hormone. Geotropism and Phototropism affect the growth of roots and shoots in plants. Environmental factors such as amount of water/moisture, light intensity and nutrients in the soil also affect the direction in which the roots grow. The roots will grow in the direction of the light, and where it can obtain essential nutrients.

Since when do roots grow towards light?

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Avocado2002

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(Original post by Gunjo)
Gland - Secrete Hormones
Muscle - Contracts

The disease was leprosy
The part of the cell was Ribosome

Fish having light meant Could attract prey/Be able to see in general
Plant was adapter as Air bubbles meant it was able to float more, reach light and photosynthesise, causing it to grow

The part of the cell was the nucleus.

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milly30

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(Original post by Gunjo)
Gene - Section of DNA, Located on the chromosome in the nucleus of the cell.

is what i wrote wrong?

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pupnisho

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6 marker - Auxin is a hormone that affects the way Shoots and Roots grow in plants. Auxin speeds up growth in the shoots and slows down growth in the roots. In both, shoots and roots, Auxin is produced in the tip. In shoots, auxin is on the side opposite to the sun. This is because it elongates the cells here, causing the shoot to bend toward the light which it needs for photosynthesis. In the roots the auxin is on the side as an act of gravity. It makes the cells where it is not present elongate, causing the root to bend in the direction of gravity and moisture

[PLEASE TELL ME IF I MAJORLY F**KED THIS UP!!]

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RG110man

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(Original post by Al_YG)
the 25c 40c and 100c question was 40 degrees

It isn't it's 25 in a school lab. Check here if you don't believe me: http://www.bbc.co.uk/schools/gcsebit...tionrev8.shtml

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Adam998

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(Original post by Al_YG)
For stating 3 reasons why the graph for the birds could be wrong is:
the date of the investigation was january 2011, a long time ago
the time of day the people investigated it was in 1 hours of the day
i forogt the third one

The same bird could be counted more than once, different birds thrive in different habitats, not necessarily in the 'backgarden
'

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Al_YG

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(Original post by RG110man)
It isn't it's 25 in a school lab. Check here if you don't believe me: http://www.bbc.co.uk/schools/gcsebit...tionrev8.shtml

You are correct however the question asked what would be used in industry

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