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Flashcards in quiz 1 Deck (18):
1

ecology

the interactions of an organism with other organisms and its evironment

2

two species interaction

outcome when both organisms present, real world is not this simple

3

competition

- harms both organisms that are interacting
- over a limiting resource
- reduces the growth and reproduction of both organisms

4

competitve exclusion principle

two species cannot live together in the same place at the same time if they are both limited by one or more of the same resource

5

theory of limiting similarity

species that are too similar cannot coexist

6

resource partioning

inferior competitors for one resource might switch to another resource
= lessens competition

7

temporal and spatial patchiness

the best competitor may not always find the resources or the inferior competitor can find the resource before found

8

enzyme

proteins that catalyze biological reaction
- they catalyze the reaction without being consumed in the reaction

9

how do enzymes work?

enzyme+ substrate -> enzyme substrate complex -> enxyme+ product

= enzymes lower the activation energy needed in a reaction

10

why are enzymes so specific?

binding takes place in an active site that is specific to the substrate
- structure determines function

11

how do you measure (assay) enzyme rate?

-by disappearance of the reactant or the appearance of a product
- measured by amount per time
- rate per weight

12

What affects reaction rate without enzyme?

-concentration of reactant and product
- temperature= higher temp, faster reaction
- reaction order= number of substrates
CTR

13

What affects reaction rate with enzyme?

-concentration of enzyme
- efficiency of the enzyme
-temperature effects on the efficiency of the enzyme
-presence of inhibitors
CETI

14

polyphenolozidase

an enzyme found in potatoes that converts catechol to orthoquinone

15

Vmax

the maximum rate of the reaction
- all enzyme reaction sites are filled

16

Km

the substrate concentration at which the reaction rate is half maximal
- varies with temperature and pH, or presence of inhibitors
- the lower the Km the more likely that the enzyme is operating at its Vmax

17

competitive inhibition

a molecule with a similar shape competes for an active site
- inhibitory has less of an effect at higher levels of substrate

18

non competitive inhibition

the competitor acts on the enzyme but not at an active site= changes active site ( lowers Vmax)
- can be reversible or irreversible