Top answers

Describe the pressure and volume changes in the lungs during inspiration

During inspiration, the intercostal muscles contract, moving the sternum up and out. This increases the thoracic volume, hence decreasing the pressure. The pressure gradient set up causes air inflow from out...
DN
Answered by Dhaval N. • Biology tutor
4659 Views

Outline the circulation of blood and the physical changes of the heart during the cardiac cycle.

The cardiac cycle is split into 2 main phases: systole where the heart contracts and ejects blood out from the heart and diastole where the heart relaxes and fills with blood. The right side of the heart pum...
AM
Answered by Aishah M. • Biology tutor
3151 Views

Using a genetic diagram, identify the genotypes of the F2 generation of pea pods if a homozygous green pod and a homozygous yellow pod were crossed initially. The yellow pod contained recessive alleles (g).

A homozygous green pod will have a GG genotype while a homozygous yellow pod will have gg. Each parent has two alleles but only one is passed to an individual offspring via the gametes. In this case, the pos...
JN
Answered by Jessica N. • Biology tutor
4976 Views

Explain the process of oxidative phosphorylation and the electron transport chain in the production of ATP in respiration.

Oxidative phosphorylation and the electron transport chain (ETC) are both aerobic processes that require oxygen. These processes occur in the mitochondria of cells across the inner mitochondrial membrane. El...
KP
Answered by Keval P. • Biology tutor
5141 Views

A mutation of a tumour suppressor gene can result in the formation of a tumour. Explain how. Not all mutations to the gene result in a tumour. Explain how.

To answer this two-part question students must be able to understand two concepts: what a gene can do; and what constitutes a gene. For the first part, a mutation in the genetic code of the tumour suppresor ...
LY
Answered by Luke Y. • Biology tutor
8279 Views