Chapter 3 - Biological molecules - overview and water Flashcards
what are the six main elements in biological molecules
oxygen hydrogen nitrogen carbon sulphur phosphorus
how many bonds can the four main elements form
carbon - 4
nitrogen - 3
oxygen - 2
hydrogen - 1
what is an ion
an atom or molecule where the number of electrons is not equal to the number of protons
what elements are in the four main biological molecules
carbohydrates - CHO
lipids - CHO
proteins - CHONS
nucleic acids - CHONP
what is a polar molecule
a molecule where the electron sharing is not equal so there are regions of positivity and regions of negativity
which atom has the larger share of electrons in water
oxygen
what are the bonds called that are formed between polar molecules
hydrogen bonds
is water more or less dense as a solid than as a liquid
less - ice floats
what is cohesion
water moves as one mass
what is adhesion
water molecules are attracted to other materials
what is capillary action
the process by which water can travel up a narrow tube against gravity
