Def Test Flashcards Preview

Biology > Def Test > Flashcards

Flashcards in Def Test Deck (33):
1

Diffusion

Movement of a liquid/gas through a semi-permeable membrane, from a high to a low concentration. This movement doesn’t require the input of energy / passive process.

2

Osmosis

The movement of water (liquid/vapor) from an area of high to an area of low concentration, through a semi-permeable membrane until equilibrium is achieved. Passive process.

3

Active transport

The movement of a liquid/gas from a low to a high concentration, through a semi-permeable membrane. Energy is required.

4

Facilitated diffusion

The movement of a liquid/gas through a semi-permeable membrane, from a high to a low concentration with the aid of channels / proteins. Doesn’t require the input of energy / active process.

5

Cohesive forces

The type of force exhibited between molecules of the same substance.

6

Adhesive forces

Type of force exhibited between molecules of different substances.

7

Capillary action.

The combination of cohesive and adhesive forces allowing a liquid substance to move (up) through a narrow tube.

8

Solute

Substance that dissolved in a solvent to form a solution.

9

Solvent

Substance in which the solute dissolved to form a solution.

10

Solution

A homogeneous state in which a solute has fully dissolved in a solvent.

11

Tonic

Refers to the (mineral / salt) solute concentration of a solution, when comparing two solutions across a semi-permeable membrane.

12

Hypotonic solution

The solute concentration is lower compared to a solution on the other side of a semi-permeable membrane within a cell solution.
Water move via osmosis out the solution.

13

Hypertonic solution

The solute concentration is higher compared to a solution on the other side of a semi-permeable membrane within a cell solution. Water move via osmosis into the solution.

14

Isotonic solution

Same solute concentration on either side of the semi-permeable membrane.

15

Monosaccharide

Monomer of a carbohydrate / polysaccharide

16

Polysaccharide

Carbohydrate / polymer of simple sugars.

17

Ovule

Female plant gamete.

18

Ovary

Female reproduction organ

19

Ovum

Female animal gamete.

20

Angiosperm

Phylum flowering plants

21

Pollination

Transfer of pollen from anther to the stigma

22

Cross-pollination

Transfer of pollen between different plants of the same of different species

23

Nucleic acid

DNA / RNA molecule that comprises of nitrogenous bases bound to a sugar-phosphate backbone. DNA has deoxyribose sugar, RNA has a ribose sugar.

24

DNA replication

Process by which DNA molecule makes an exact copy of itself to prepare for replication. Replicated chromosomes are joined by a centromere.

25

Ribosome

Organelle that functions in protein synthesis.

26

Nucleotide

Monomer if a nucleic acid compromising of a nitrogenous base, sugar and phosphate complex.

27

Polymerase

Enzyme that catalysts DNA replication

28

Primary succession

Plant life, occurring in an environment in which the new substrate is devoid of previous vegetation and other organisms, usually lacking soil.

29

Ecological succession

The process of change in the species structure in an ecological community over time.

30

Secondary succession

A process started by an event that reduces an already established ecosystem to a smaller population of species, meaning that this type of succession usually occurs on preexisting soil.

31

Pioneer stage

First species to establish in an area

32

Intermediate stage

Stage of ecological succession where the environmental is more stable, soil consists of nutrients. Generally characterized by shrub-type plants and medium-sized animals

33

Climax stage

Final, dynamic stage of ecological succession which comprises of species that are characterized to that biome.