Chapter 3 - Biological molecules - overview and water

Question 1

what are the six main elements in biological molecules

Answer 1

oxygen hydrogen nitrogen carbon sulphur phosphorus

Question 2

how many bonds can the four main elements form

Answer 2

carbon - 4
nitrogen - 3
oxygen - 2
hydrogen - 1

Question 3

what is an ion

Answer 3

an atom or molecule where the number of electrons is not equal to the number of protons

Question 4

what elements are in the four main biological molecules

Answer 4

carbohydrates - CHO
lipids - CHO
proteins - CHONS
nucleic acids - CHONP

Question 5

what is a polar molecule

Answer 5

a molecule where the electron sharing is not equal so there are regions of positivity and regions of negativity

Question 6

which atom has the larger share of electrons in water

Answer 6

oxygen

Question 7

what are the bonds called that are formed between polar molecules

Answer 7

hydrogen bonds

Question 8

is water more or less dense as a solid than as a liquid

Answer 8

less - ice floats

Question 9

what is cohesion

Answer 9

water moves as one mass

Question 10

what is adhesion

Answer 10

water molecules are attracted to other materials

Question 11

what is capillary action

Answer 11

the process by which water can travel up a narrow tube against gravity