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Biology
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Briefly explain how Darwin formulated his theory of evolution by natural selection.

Darwin made four key observations in his studies of wild populations: members of a population of the same species vary in their traits; traits can be inherited, or passed from parents to offspring; popula...

ZL
Answered by Zak L. Biology tutor
3022 Views

Explain how a nerve impulse causes the chambers of the heart to contract (6).

The heart's excitation is myogenic and therefore can be started without any transmission from the brain. The sino-atrial node is found behind the posterior wall of the left atrium and is where the action ...

JS
Answered by Jeremy S. Biology tutor
2438 Views

Distinguish between eukaryotic and prokaryotic cells

Eukaryotic Cell - DNA with proteins; DNA surrounded by membrane; Has mitochondria; 80S Ribosome; Reproduces by mitosis; Membrane-bound organelles; Chromosome are linear; Larger in size

Prokaryotic ...

JW
Answered by Jason W. Biology tutor
1907 Views

What happens during mitosis?

There are several phases to mitosis: interphase, prophase, metaphase, anaphase, and telophase. In interphase, the cell duplicates it’s organelles and chromosomes, ready for mitosis. In prophase, the chrom...

JS
Answered by Julia S. Biology tutor
2514 Views

What is the difference between competetive and non-competetive inhibitors?

Competetive inhibitors are the same shape as the enzyme substrate. They bind directly to the active site of the enzyme, preventing the binding of the substrate. Therefore, if you increase the concentratio...

AC
Answered by Andreas C. Biology tutor
2595 Views

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