Top answers

Describe how a healthy kidney produces urine. (5 marks)

In this question you must first look at the wording. This is a describe question and therefore a description is required but not an explanation. It is worth 5 marks so aim to describe 5 or more reasons how a...
HG
Answered by Hannah G. • Biology tutor
22699 Views

Describe how cell division by meiosis is different from cell division by mitosis.

Meiosis produces four cells through two cell divisions, whereas mitosis produces two cells through one cell division 2. Meiosis produces haploid cells, whereas mitosis produces diploid cells 3. Meiosis halve...
EA
Answered by Eyad A. • Biology tutor
8059 Views

Describe the role of haemoglobin in supplying oxygen to the tissues of the body?

Haemoglobin is an oxygen carrying molecule found in red blood cells. Haemoglobin is made up of four polpeptide chains (2 alpha, 2 beta), and consists of four haem groups (iron associated with heam) containin...
OB
Answered by Olivia B. • Biology tutor
16359 Views

7 Albinism is a genetic trait resulting from the inheritance of recessive alleles. (a) (i) Distinguish between the terms allele and gene. (ii) Explain the meaning of the term recessive allele.

a i) a gene is a section of DNA that codes for a protein and has a specific location on a chromosome while an ellel is just a different form of a gene ii) a recessive allele is one that is expressed in the p...
EI
Answered by Elysa I. • Biology tutor
5791 Views

Why do myelinated axons propagate action potentials faster than unmyelinated axons?

Unlike unmyelinated axons, myelinated axons are surrounded by an insulatory myelin sheath produced by Schwann cells. Because of this insulatory sheath, action potentials cannot occur along the entire length ...
TD
34395 Views