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What is a pathogen?

-it is a disease-causing microorganism -it is known to be infectious -examples: bacteria, fungi, viruses
MF
Answered by Maria F. • Biology tutor
3788 Views

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...
HS
Answered by Hugh S. • Biology tutor
91345 Views

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
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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
14425 Views

Chaacteristics of living things

Living things differ from non-living things based on certain characteristics. There are 7 characteristics that identify living things and these can be remembered with the acronym MRS GREN. Movement Respirati...
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Answered by Bubaraye U. • Biology tutor
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