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Type 1 Diabetes is an autoimmune disease affecting the bodies ability to produce insulin. Describe how blood glucose is controlled in the body to a stable level, and how this would be affected in someone with type 1 diabetes.

Blood glucose is controlled via a negative feedback mechanism. High blood glucose is detected by B-cells of the Islets of Langerhans in the pancreas, and in response to this, these cells secrete insulin. ...

Answered by William H. • Biology tutor

2079 Views

One of the most important roles of cell membranes is to control what substances enter and leave the cell. Describe the difference and a briefly outline the mechanism for passive and active transport of molecules over cell membranes.

Passive transport requires no energy and is dependent on concentration difference gradient of intra and extracellular spaces. Channel protein can be opened or closed to allow or stop the free flow of mole...

Answered by Aaron C. • Biology tutor

2637 Views

Describe how the information in DNA is used during transcription and translation to construct polypeptides, including the role of messenger RNA (mRNA), transfer RNA (tRNA) and the ribosomes.

RNA Is synthesised in the nucleus from a DNA template. During synthesis of RNA, the two strands of the DNA molecule separate temporarily; one of these strands is used as a template for synthesis of an RNA...

Answered by Nikolaos S. • Biology tutor

5547 Views

How is the heart beat controlled?

The heart is composed of myogenic muscle and generates its own rate in normal condition. This rate can be modified during increased or decreased respiratory demand.
The heart beat is initiated by a ...

Answered by Tutor171151 D. • Biology tutor

4967 Views

An airtight compost heap causes anaerobic decay. Explain why the gardener might be against producing compost using this method

Anaerobic decay produces two main gases. Carbon dioxide and Methane.
Methane, more importantly, is one of the five greenhouse gases that results in global warming.

Answered by Jananiy P. • Biology tutor

10299 Views