quiz 1

Question 1

ecology

Answer 1

the interactions of an organism with other organisms and its evironment

Question 2

two species interaction

Answer 2

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

Question 3

competition

Answer 3

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

Question 4

competitve exclusion principle

Answer 4

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

Question 5

theory of limiting similarity

Answer 5

species that are too similar cannot coexist

Question 6

resource partioning

Answer 6

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

Question 7

temporal and spatial patchiness

Answer 7

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

Question 8

enzyme

Answer 8

proteins that catalyze biological reaction

- they catalyze the reaction without being consumed in the reaction

Question 9

how do enzymes work?

Answer 9

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

= enzymes lower the activation energy needed in a reaction

Question 10

why are enzymes so specific?

Answer 10

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

Question 11

how do you measure (assay) enzyme rate?

Answer 11

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

Question 12

What affects reaction rate without enzyme?

Answer 12

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

Question 13

What affects reaction rate with enzyme?

Answer 13

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

Question 14

polyphenolozidase

Answer 14

an enzyme found in potatoes that converts catechol to orthoquinone

Question 15

Vmax

Answer 15

the maximum rate of the reaction

- all enzyme reaction sites are filled

Question 16

Km

Answer 16

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

Question 17

competitive inhibition

Answer 17

a molecule with a similar shape competes for an active site

- inhibitory has less of an effect at higher levels of substrate

Question 18

non competitive inhibition

Answer 18

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