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Explain the importance of neurones and synapses in the reflex arc

The reflex arc is essential in producing a quick involuntary response aimed to prevent injury in an individual. In response to a stimulus (such as intense heat/fire), the sensory neuron detects this and tran...
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Answered by Hanin R. • Biology tutor
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Compare and contrast the features of eukaryotic DNA and RNA

Both DNA and RNA a nucleic acids, made up of nucleotides, that encode genetic information. A nucleotide is a molecule composed of phosphate, sugar and a base, and these nucleotides bind to one another to for...
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Answered by Sophia A. • Biology tutor
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How do populations of bacteria develop antibiotic resistance?

There is VARIATION amongst the population due to naturally occuring MUTATION during DNA replication . The antibiotics act as a SELECTION PRESSURE, so only the bacteria with the allele for antibiotic resistan...
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Answered by Leila G. • Biology tutor
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Oxygen is exchanged between the blood capillaries and the tissues. Give two ways in which capillaries are adapted for exchanging blood with the tissues.

Thin walls for short diffusion path 2. Narrow, so have a large surface area to volume ratio
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Answered by Leila G. • Biology tutor
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What endocrine glands regulate sexual activity in males? How does this regulation work and what hormones are involved?

Here are the endocrine glands that regulate sexual activity in males: 1) the hypophysis (aka. the pituitary); 2) the adrenal glands; 3) the gonads (testicles). - - - - - - - - - - - - - It's pretty much all ...
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Answered by Lydia T. • Biology tutor
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