Top answers

Explain how the mammalian pancreas controls blood sugar concentration after a meal.

The pancreas consists mainly of exocrine tissue (<98%) which produces pancreatic enzymes required for digestion. The remaining endocrine tissue is organised into Islets of Langerhans which contain 5 diffe...
CH
Answered by Cara H. • Biology tutor
2900 Views

In ecology, what does the phrase 'carrying capacity' refer to and what factors may determine it?

Carry capacity refers to the maximum population size a species can reach in a particular environment.Important factors in determining carry capacity (among others):Food availabilityPredator population sizeSp...
JG
Answered by Jacob G. • Biology tutor
3691 Views

30% of a population lacks the ability to taste the chemical PTC. Non-tasters are homozygouse recessive for this tasting gene. What percentage of the population are tasters and what percentage of the population are NOT heterozygous for this trait?

This question requires the knowledge of two equations from the Hardy-Weinberg Principle. p + q = 1 and p 2 + 2pq + q 2 = 1 where p = dominant allele, and q = recessive allele. Firstly we know from the questi...
FH
Answered by Fergal H. • Biology tutor
6097 Views

What is natural selection and how is it different from evolution?

Natural selection can be defined as: The gradual process in which inherited characteristics become more or less common in a population, in response to the environment determining the breeding success of indi...
HC
Answered by Harry C. • Biology tutor
2845 Views

How is blood glucose regulated?

High blood glucose levels - such as following a large, carbohydrate rich meal. The increase is detected by Beta cells of the pancreas, which release insulin (a hormone) into the blood. Insulin acts on cells ...
LK
Answered by Lois K. • Biology tutor
2979 Views