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AQA Biology B1 Higher - Unofficial Mark Scheme

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.

(edited 8 years ago)

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Reply 1

Auxin

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

Reply 2

annabelsw

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

Reply 3

Avocado2002

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.

Reply 4

izzy_lm

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

Reply 5

Banana00

Original post by izzy_lm

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

does disease-causing microorganisms count?

Reply 6

milly30

gene- contains genetic information that controls your characteristics

Reply 7

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

Reply 8

Al_YG

a pathogen is a microorganism that causes infectious disease

Reply 9

Al_YG

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

Reply 10

Gunjo

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.

Reply 11

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

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

(edited 8 years ago)

Reply 12

Adam998

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

Reply 13

Avocado2002

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?

Reply 14

Avocado2002

Original post by Gunjo

The part of the cell was the nucleus.

Reply 15

milly30

Original post by Gunjo

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

is what i wrote wrong?

Reply 16

pupnisho

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!!]

Reply 17