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Explain the structure of a DNA polynucleotide strand

Think of DNA like 2 long shoelaces coiled around each other to form a spiral - or a double helix as it's called. Each of the 2 shoelaces is called a 'strand' and is made up of something called 'polynucleotid...
DF
Answered by Darius F. • Biology tutor
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What is the correct order of the reflex arc?

Students must select 1 of the following: a) Motor - Sensory - Relay b) Effector - Relay - Motor c) Sensory - Relay - Motor d) Relay - Motor - Sensory The correct answer is C. When a stimulus is detected by a...
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Answered by Beth S. • Biology tutor
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How does a nerve transmit impulses?

At rest a nerve cell or fiber has more sodium (NA+) ions in the extracellular fluid and more potassium (K+) ions in the intracellular fluid. There are both NA+ and K+ ion channels in the membrane of the nerv...
KW
Answered by Kay W. • Biology tutor
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Please can we go over the process of spermatogenesis?

Of course. Spermatogenesis takes place in the seminiferous tubules of the testis. The germinal epithelium cells, which are in the wall of the seminiferous tubule, first differentiate into diploid spermatogon...
MH
Answered by Molly H. • Biology tutor
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What is a nerve synapse, and how does it transfer information?

Synapses are junctions between nerves. They allow information (impulses) to be transferred from one nerve to the next. The first nerve conducts an electrical impulse across its length, which causes it to rel...
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Answered by Aileen B. • Biology tutor
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