Top answers

What's the difference between the Imperfecto and Indefinitivo tenses?

Both Imperfecto and Indefinitivo are past tenses. Imperfecto is a tense used to describe states, emotions, circumstances, settings - it implies that the action has not been finite in the past. For example: I...
KJ
Answered by Karolina J. • Spanish tutor
4334 Views

Why does the nervous system have synapses if they slow down transmission?

Synapses are chemical connections between neurons which do indeed slow down transmission. However, they provide the nervous system with many benefits that could not be achieved without them: They ensure that...
SJ
Answered by Samuel J. • Biology tutor
21262 Views

The genetic code is described as being degenerate. What does this mean? and why ?

We say that the genetic code is degenerate because there are several codons, which code for the same amino acid. For example UCA, UCU, UCG and UCC all code for Serine. This is due to the fact that mRNA codin...
MD
Answered by Maria D. • Biology tutor
14307 Views

If cells can respire anaerobically, why do humans need oxygen?

Cells can indeed respire - or release energy - without oxygen, using anaerobic respiration. Here, energy is released from glucose to generate a substance called lactic acid. This is a good temporary solution...
SJ
Answered by Samuel J. • Biology tutor
26234 Views

Why don't antibiotics work against viruses?

Antibiotics are a class of drugs which were discovered to be effective against bacterial infections, strictly speaking, they are called antibacterial chemotherapeutics; meaning they are drugs which selective...
TC
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