Top answers

Why is bacteria in school labs incubated at 25°C or lower?

Bacteria resides virtually everywhere around (and within) us. In schools and university conditions, bacteria cultures are incubated at 25°C or lower to reduce the chances of growing harmful pathogens which c...
EP
Answered by Ekaterina P. • Biology tutor
34540 Views

Explain the processes of translocation and transpiration in plants (6 marks)

Transpiration is the upward movement of water from the root to the cell. This happens in the xylem which is made of lignified cells. The flow is only in one direction and the movement of water is created by ...
ZS
Answered by Zoe S. • Biology tutor
31535 Views

Describe the role of DNA polymerase in DNA replication.

DNA polymerase is an enzyme that catalyses the synthesis of DNA molecules from free nucleotides. After DNA helicase unwinds the DNA molecule, DNA polymerase reads the existing DNA strands and incorporates co...
TW
Answered by Tamsin W. • Biology tutor
24716 Views

Describe how a vaccine leads to production of antibody against the disease (4 marks)

This question is asking for an outline of how antibody is produced in an immune response, and for the 4 marks, we need to identify 4 or more steps using key words in this process. This question could also be...
EP
Answered by Erin P. • Biology tutor
3571 Views

Sophie accidentally puts her hand on an open flame, she immediately withdraws her hand. This is an example of a reflex reaction. Describe how a reflex reaction is coordinated.

Reflex reactions are subconscious, they bypass the brain. Receptors detect a sensory stimulus, in this case- pain. Receptors stimulate sensory neurons, creates an electric impulse which travels to the spinal...
AL
Answered by Amelia L. • Biology tutor
2278 Views