Search our library of Biology questions

Top answers

Biology

All levels

Describe the process of breathing

The diaphragm contracts, moving downwards. The external intercostal muscles contract, and the internal intercostal muscles relax. Pressure in the chest cavity decreases, forcing air into the lungs. The di...

Answered by Ailin C. • Biology tutor

2380 Views

What are the key steps in DNA replication during the S-phase of the cell cycle?

The enzyme DNA helicase 'unzips' the double helix DNA structure but disrupting the hydrogen bonds between the bases. This forms a replication fork that becomes the template for replication.Replication the...

Answered by Natasha E. • Biology tutor

3645 Views

Name a non-reducing sugar and outline a test which can identify its presence. (6)

Sucrose (1)Rule out reducing sugars - heat in a water bath. Add Benedict's solution. Should remain blue. (1)Add dilute HCl to a new sample and heat in a water bath (1)Neutralise with NaHCO3 (1)Add Benedic...

Answered by Annie R. • Biology tutor

2751 Views

Where does digestion of protein occur?

Digestion of protein starts in the stomach and does not occur in the buccal cavity (mouth). Acidic environment (low pH) due to HCL (hydrochloric acid) in the stomach allow for pepsinogen to be converted i...

Answered by Michal K. • Biology tutor

1501 Views

Describe the 3 overall stages of the cell cycle and the processes ongoing during the cell's life.

The cell cycle is composed of 3 main stages:

1) Interphase

During the interphase stage of the cell cycle, the cell grows and organelles such as mi...

Answered by Yousif A. • Biology tutor

84742 Views