Top answers

A scientist discovers a diseased tomato plant where a disease has caused discolouration in the leaves due to a decrease in chlorophyll. Explain why this tomato plant produces far less tomatoes and is much smaller than a healthy tomato plant.

The decrease in chlorophyll in the diseased plant leaves means the light energy cannot be used to make glucose via photosynthesis in the chloroplasts. Tomatoes store a lot of glucose therefore with less gluc...
PS
Answered by Phoebe S. • Biology tutor
3219 Views

explain the contraction of the skeletal muscle, according to the muscle sliding filament theory.

ATP binds to the myosin head Hydrolysis of ATP causes the head to come to a “cocked” position. Then the head binds to the actin binding site creating a cross-bridge ADP and Pi are released from the myosin, c...
IZ
Answered by Ioanna Z. • Biology tutor
2086 Views

How does a reflex arc work?

A reflex arc is a system of sensory, motor and relay neurones that work together to provide a quick reaction to stimulus that protects us from danger. A really good example that often comes up in textbooks a...
AW
Answered by Abraham W. • Biology tutor
3444 Views

Diabetes can damage the nervous system. Explain how this may alter the response of heart rate to changes in blood pressure.

Changes in blood pressure are measured by primarily by baroreceptors (pressure receptors) in the carotid body within the aorta, which send signals to the medulla in the brain. Damage to the autonomic nervous...
MC
Answered by Mostafa C. • Biology tutor
2908 Views

What is the difference between mitosis and meiosis?

Meiosis is the process by which new gametes are formed in the testes and ovaries. Mitosis is the process by which all other cells of the body divide, for tissue growth and repair. One way of remembering this...
KL
Answered by Katy L. • Biology tutor
10036 Views