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B1.2 OCR Biology definitions

Total questions: 12

Worksheet time: 6mins

Name
Class
Date
1.

chromosome

a)

enzyme for carbohydrates

b)

long molecule of DNA

c)

colourful DNA

2.

gene

a)

where a reaction takes place in an enzyme

b)

something you wear on your legs

c)

short section of DNA that codes for a characteristic like eye colour

3.

nucleotide

a)

the centre of the atom

b)

small unit that makes up DNA

c)

the brain of the cell

4.

polymer

a)

molecule made of many smaller molecules joined together

b)

used to fill in walls

c)

binds to an enzyme

5.

complementary base pairing

a)

the way bases bond together in DNA (Adenine to Thymine and Guanine to Cytosine)

b)

the way people are matched on dating apps

c)

they way people run round the rounders pitch

6.

double helix

a)

a new chocolate bar

b)

the shape of DNA

c)

an enemy of Doctor Who

7.

enzyme

a)

biological catalyst

b)

a new planet

c)

the leaf of a plant

8.

catalyst

a)

something found in car exhausts

b)

something that speeds up a reaction

c)

a genetically engineered cat that can write shopping lists for you

9.

active site

a)

place where people keep fit

b)

place on an enzyme, specially shaped so the substrate can bind to it

c)

somewhere workmen put up buildings

10.

substrate

a)

molecule that binds to an enzyme

b)

passageway under a road

c)

an underground train

11.

lock and key hypothesis

a)

model for how doors work, using locks and keys

b)

model for how enzymes work, with enzymes being the lock and substrates being the key

c)

theory behind canal boat travel

12.

denatured

a)

when an enzyme dies

b)

when an enzyme stops working permanently because it has been heated to too high a temperature so the protein chains unravel and the enzyme changes shape

c)

when an area is destroyed due to climate change and animals and plants die