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Describe the different environmental factors that affect the direction of root and shoot growth

There are three main factors that affect root and shoot growth, which are light (phototropism), gravity (geotropism) and water (hydrotropism).Both roots and shoots show positive tropism whereby growth is sho...
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Answered by Maria F. • Biology tutor
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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
5253 Views

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
91120 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
7663 Views