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What is the difference between genotype and phenotype?

Everyone has two copies of each gene, one inherited from the mother and one from the father. The combination of both these copies is called the genotype. However the phenotype is what is visibly expressed. F...
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Answered by Sukhmani S. • Biology tutor
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What is a pathogen?

-it is a disease-causing microorganism -it is known to be infectious -examples: bacteria, fungi, viruses
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Answered by Maria F. • Biology tutor
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Explain the differences between primary, secondary and tertiary protein structure.

Primary structure is the order in which what amino acid is bound the other with a peptide bond. This is coded for by the order of codons in a gene. Secondary structure is how the chains on amino acids intera...
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Answered by Hugh S. • Biology tutor
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Explain the sliding filament model of muscular contraction

The presence of calcium ions causes tropnonin to detach from tropomyosin-this exposes the mysoin head binding sites. Myosin head groups attach to the surrounding actin filaments forming a cross bridge. The h...
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Answered by Karishma D. • Biology tutor
7777 Views

Describe how the cardiac cycle is coordinated with reference to the sinoatrial node (SAN), the atrioventricular node (AVN), and Purkinje tissue.

The SAN is the pacemaker, situated at the top of the right atrium. The SAN initiates a wave of excitation at regular intervals. The wave of excitation quickly travels over the walls of both atria. As it pass...
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Answered by Karishma D. • Biology tutor
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