metabolism 1

Question 1

many of these chemical reactions that occur are linked in sequences called?

Answer 1

metabolic pathways

Question 2

what is metabolism?

Answer 2

metabolism is the sum of all the chemical reactions that occur in a cell

Question 3

each step in the pathway is?

Answer 3

catalyzed by an enzyme

Question 4

one product of one pathway can?

Answer 4

influence the reaction of another pathway

Question 5

anabolic pathway?

Answer 5

• requires energy
• builds larger molecules from smaller ones
• endergonic reaction

Question 6

catabolic pathway?

Answer 6

• releases energy
• larger molecules are broken down into smaller products
• exergonic reaction

Question 7

these reactions: anabolic and catabolic are?

Answer 7

coupled in the cell

Question 8

the cell couples the energy releasing reactions to the?

Answer 8

energy requiring reactions in the cell

Question 9

how are the reactions linked?

Answer 9

via intermediates called? energy-carrier molecules
- high energy unstable molecules

Question 10

what is the most common energy carrier molecule in the body?

Answer 10

adenosine triphosphate: it holds on to the energy released from exergonic reactions and provides it to endergonic reactions when needed

Question 11

what is the structure of atp?

Answer 11

adenine base, ribose sugar, and 3 phosphate groups

Question 12

atp is one of the?

Answer 12

nucleotides used to make RNA

Question 13

ATP plays a role in?

Answer 13

energy coupling

Question 14

how does atp store the captured energy?

Answer 14

it stores energy within its chemical bonds

Question 15

the atp diffuses…

Answer 15

throughout the cell, carrying its stored energy to sites where it is needed

Question 16

how is energy released from atp?

Answer 16

energy is released when atp is hydrolyzed to adp and pi

Question 17

what does the cell require energy for?

Answer 17

3 main types of work: chemical work, mechanical work, and transport work

Question 18

an organism at work uses atp…

Answer 18

continuously so it has to be regenerated. the cell regenerates atp from adp continuously.

Question 19

its use and regeneration is known as the?

Answer 19

atp cycle

Question 20

most organisms get their energy from the breakdown of?

Answer 20

glucose: but it doesnt get broken down in one step but over a series of steps

Question 21

the energy released at each step is ?

Answer 21

used to make atp

Question 22

how does that happen?

Answer 22

at key steps, electrons are removed from glucose, they then get picked up by energy carrier molecules called electron carriers

Question 23

examples of electron carriers?

Answer 23

• NADH: nicotinamide adenine dinucleotide
  FADH2: flavin adenine dinucleotide

retain their potential energy: will be used by the cell to make atp