Y11 Biology Unit Notes End of Year Exam

studied byStudied by 0 people
0.0(0)
learn
LearnA personalized and smart learning plan
exam
Practice TestTake a test on your terms and definitions
spaced repetition
Spaced RepetitionScientifically backed study method
heart puzzle
Matching GameHow quick can you match all your cards?
flashcards
FlashcardsStudy terms and definitions

1 / 16

flashcard set

Earn XP

Description and Tags

Biology: enzyme structure and function, factors that affect reaction rate, activation energy

Biology

17 Terms

1

Metabolism

Web of all enzyme-catalyzed reactions in a cell or organism

New cards
2

Anabolism

Synthesis of complex molecules from simpler molecules. This includes formation of macromolecules from monomers by condensation reaction

New cards
3

Catabolism

Breakdown of complex molecules into simpler molecules. This includes breakdown of macromolecules into monomers by hydrolysis reaction

New cards
4

Condensation reaction

Chemical reactions in which reactants are joined together to form a product with water

New cards
5

Hydrolysis reaction

Chemical reactions in which reactants are separated using water to form product

New cards
6

Endothermic Reaction

A reaction that absorbs energy in the form of heat

New cards
7

Exothermic Reaction

A reaction that releases energy in the form of heat

New cards
8

Collision Theory

  1. Reactants (including enzymes and substrates) collide

  2. with the correct orientation (i.e., in the "right" place)

  3. with enough energy (E ≥ Ea)

New cards
9

Kinetic Energy

All matter is made of particles, all particles are in constant motion, the motion is random but linear, collisions are elastic

New cards
10

Enzyme


An enzyme is a biological (protein) catalyst.
● A catalyst increases reaction rate but is not used up (it is recycled).
● An enzyme is biological which means that it is found in living things. It is a protein.

New cards
11

Enzyme Specificty

An enzyme binds to and reacts with specific substrates according to the lock-n-key model. This explains substrate-enzyme specificity. The enzyme is the lock. The active site is the keyhole where the reaction takes place in the enzyme. The substrate must fit the active site - the shape of the substrate is complementary to the shape of the active site. The substrate is the key that fits into the active site which is the keyhole. The substrate is the reactant.

New cards
12

Enzyme Catalaysis


An enzyme increases reaction rate but is not permanently changed in the reaction
● An enzyme reacts with a substrate through an alternate reaction pathway
● The activation energy of alternate reaction pathway is less than that of the reaction pathway
without the enzyme

New cards
13

Reaction Rate

Change in a quantity over time, in terms of reactants, it is the rate at which they disappear. This is a negative change. In terms of products, it is the rate at which they appear. This is a positive change.

New cards
14

Reaction Rate Equation

The equation is change in amount ÷ change in time. Amount may be volume (of a gas), mass, temperature (change is a consequence of the reaction), height, length and so forth.

New cards
15

Reaction Rate Graph

Average rate is the change in amount / time (the slope) Instantaneous rate is the slope of a tangent at a given point

New cards
16

Example Reactants Analysis

As the reaction progresses, the concentration of reactants decreases. This leads to lower frequency of collision with the correct orientation and sufficient energy. Thus, rate decreases as reactions progress - highest at the beginning and lowest at the end.

New cards
17

Factors affecting Reaction Rate

Temperature, concentration, surface area and PH

New cards

Explore top notes

note Note
studied byStudied by 17 people
312 days ago
5.0(1)
note Note
studied byStudied by 38 people
379 days ago
5.0(1)
note Note
studied byStudied by 21 people
759 days ago
5.0(1)
note Note
studied byStudied by 56 people
798 days ago
5.0(4)
note Note
studied byStudied by 411 people
345 days ago
5.0(2)
note Note
studied byStudied by 20 people
898 days ago
5.0(1)
note Note
studied byStudied by 14 people
899 days ago
5.0(1)

Explore top flashcards

flashcards Flashcard (147)
studied byStudied by 56 people
850 days ago
5.0(1)
flashcards Flashcard (31)
studied byStudied by 16 people
87 days ago
5.0(1)
flashcards Flashcard (90)
studied byStudied by 26 people
422 days ago
5.0(2)
flashcards Flashcard (46)
studied byStudied by 5 people
395 days ago
5.0(1)
flashcards Flashcard (297)
studied byStudied by 602 people
832 days ago
5.0(2)
flashcards Flashcard (26)
studied byStudied by 3 people
815 days ago
5.0(1)
flashcards Flashcard (42)
studied byStudied by 11 people
548 days ago
5.0(1)
flashcards Flashcard (38)
studied byStudied by 7 people
638 days ago
5.0(1)
robot