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Describe how the origin of living systems is explained by natural processes. Please provide supporting evidence for hypotheses.

Numerous experimental investigations have been conducted to explain the diversity and unity of life. Specifically, these models have aimed to provide evidence that the conditions of early Earth provided an e...
RS
Answered by Ruth S. • Biology tutor
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What is the sliding filament mechanism?

The sliding filament mechanism is a model used to show the way in which muscles contract. It involved 3 components - Myosin, Actin and Tropomyosin. Myosin has a head like projection to which an ADP molecule ...
JC
Answered by Joseph C. • Biology tutor
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How do you explain the change in membrane permeability as temperature increases?

Generally, increasing the temperature increases membrane permeability. At temperatures below 0 o C the phospholipids in the membrane don't have much energy and so they can't move much, which means that they'...
EF
Answered by Ella F. • Biology tutor
69717 Views

Describe the course taken by a deoxygenated red blood cell returning to the heart from the circulation, naming any vessels or chambers along its course.

Following its return to the right atrium via the vena cava, the RBC passes through the mitral valve and into the right ventricle. Upon ventricular contraction, the RBC is ejected via the pulmonary valve and ...
WB
Answered by William B. • Biology tutor
3156 Views

How do negative and positive feedback loops occur and how are they different?

Think of them as a flow chart. Stimulus (a change) | Sensor (detects the change) | Control (sends a signal about the change) | Effector (response to the change) (connect a line to Stimulus) Negative feedback...
EC
Answered by Emma C. • Biology tutor
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