Top answers

Name 3 barriers against infection

Any 3 from. Skin. Mucus -in nose, trachea (cilia waft the mucus into the stomach to be destroyed) . Stomach acid. lysosomes (e.g. in tears and saliva)
JS
Answered by Josephine S. • Biology tutor
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Describe the structure of DNA in the eukaryotic cell

DNA is a double stranded helix. Each strand is held together by complementary base pairs or nucleotides. A nucleotide consists of a base, a deoxyribose sugar and a phosphate. The bases are A, T, C and G. G a...
ML
Answered by Megan L. • Biology tutor
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What is the difference between conservation and preservation regarding species

Although they both promote sustainability: Conservation is the human involvement in attempts to protect wildlife. Usually with endangered species where they can be tracked and looked after with human help, t...
AC
Answered by Aadil C. • Biology tutor
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If a car is travelling for 30 minutes at 40 miles per hour, how far will it travel in this time?

20 miles
LW
Answered by Lily W. • Biology tutor
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What techniques were employed in the 'Calvin Experiment' to elucidate the carboxylation of RuBP (IB-HL 8.3)?

Calvin carried out ‘feeding experiments’ where radioactive labelled carbon was fed to plants. 14 CO 2 is taken up the cells and is then fixed into photosynthesis. 14 CO 2 was induced into the plants and moni...
AK
Answered by Adam K. • Biology tutor
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