Definitions

Question 1

Law of mass action

Answer 1

the rate of a reaction (rate of formation of reaction products) is proportional to the number of collisions between reactant molecules per unit time
the probability of collision is given by the product of the reactant concentrations (for an ‘ideal solute’)

Question 2

QSSA

Answer 2

Assume that the enzyme rapidly ‘fills up’ with substrate:

d[C]/dt is approximately zero

Question 3

Cooperativity

Answer 3

when the enzyme has more than one substrate binding site, when a molecule binding at one site affects the binding at another (allosteric effect)

Question 4

TF

Answer 4

a protein that controls the rate of transcription of genetic information from DNA to messenger RNA, by binding to a specific DNA sequence

help or hindering rna pol, activate or inhibit

Question 5

Operon

Answer 5

a sequence of coding regions (called structural genes) that code for a set of functionally related enzymes, whose expression is controlled by a single promoter

Question 6

Motif

Answer 6

sets of interacting genes and proteins that carry out specific tasks and can be hooked together by standard linkages

Question 7

Graded

Answer 7

response increases continuously with signal strength

Question 8

Reversible

Answer 8

if signal strength is changed from Sinitial to Sfinal, the response at Sfinal is the same whether the signal is being increased (Sinitial < Sfinal) or decreased (Sinitial > Sfinal).