IB Biology HL

Specific heat

• The amount of heat that must be added to one gram of a substance in order to raise its temperature by one degree celsius

• Occurs when molecules of the same type are attracted to each other. (Water has cohesive properties)

• A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other

• Upward force exerted on an object placed in the medium – either water or air

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Adhesion

• The epidermal cells of leaves are capable of secreting a wax that is used to coat the leaves to prevent excessive water loss.

• The layer of water molecules at the surface has a relatively strong cohesion force around and below the water molecules allowing it to act like a solid. 

• An attraction between two unlike molecules due to hydrogen bonding.

• A measure of the ability of a material to transfer heat

Buoyancy

• Occurs when molecules of the same type are attracted to each other. (Water has cohesive properties)

• Any solution that has water as the solvent.

• Upward force exerted on an object placed in the medium – either water or air

• The small tubes in a plant that moves the water upwards

Classifying organisms using molecular differences in protein sequences and DNA

Tags

NGSS.HS-LS1-1

The study of evolutionary past of a species

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

NGSS.MS-LS4-3

A diagram that shows the lines of evolutionary descent of different species, organisms, or genes from a common ancestor.

Group compromising the most recent common ancestor of that group and all its descendants

Tags

NGSS.MS-LS4-2

A natural system of classification for grouping taxa based on the characteristics that have evolved most recently.

Tags

NGSS.MS-LS4-2

Also characteristics that have similar structure and function but have evolved more recently in the form of modification of previous traits.

Tags

NGSS.MS-LS4-2

The process of joining two single strands of DNA to form double-stranded DNA connected with hydrogen bonds between nucleotide bases