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How are membranes classified according to their permeability?

An impermeable membrane is one through which no substance can pass. Semipermeable membranes are those which only let solvents, such as water, pass through them. Permeable membranes are those which let solven...
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Answered by Adam M. • Biology tutor
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Explain the role of the pancreas in controlling blood glucose levels when they are too high.

Blood glucose levels increase after the consumption of carbohydrates. To answer this question, it is important to understand how the pancreas works. The pancreas is an organ that releases hormones - it is an...
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Answered by Krishna P. • Biology tutor
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Cystic fibrosis is an autosomal recessive condition. In a population, 0.04% of individuals have the disease. Use the Hardy-Weinberg equation to calculate the number of carriers of cystic fibrosis.

Autosomal recessive means that 2 copies of a allele are required for the phenotype. The phenotype is the set of observable characteristics due to the genotype. In this case the phenotype is whether an indivi...
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Answered by Caitlin N. • Biology tutor
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Describe the lock and key theory in reference to the enzyme Amylase

The lock and key theory suggests that there is a complimentary shaped substrate that will fit exactly into the specific shape of the enzyme's active site. In this case, amalyase is the enzyme and the substra...
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Answered by Alexander G. • Biology tutor
28750 Views

Describe the structure of a protein

All proteins are polymers of amino acids arranged with varying degrees of complexity. The most basic structure is the order of amino acids, this is called the primary structure. Amino acids form peptide bond...
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Answered by Sam C. • Biology tutor
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