Transcript Who Wants To Be A Biologist?

Who Wants To Be
A Science Expert?
With your host,
Ms. Beth Walker
$100

The oxygen
consumed during
cellular respiration is
directly involved in:
A) Glycolysis
B) Accepting
electrons at the
end of the ETC
c) The citric acid
cycle
D) The oxidation of
pyruvate to acetyl
CoA
$100 - Answer
The correct answer is B!!
 Oxygen is very electronegative and
pulls the electrons down the ETC to
itself

$500

Cyclic electron flow
in the chloroplast
produces:
A)
B)
C)
D)
E)
ATP
NADPH
Glucose
A and B
A, B and C
$500 - Answer
The correct answer is A!!!
 Cyclic electron flow is a part of the
light-dependent reactions. This part of
the light reactions makes ATP, which
goes to the dark reactions to make
glucose.

$1000

In a plant cell,
where is ATP
synthase located?
Thylakoid
membrane
B) Plasma
membrane
C) Inner
mitochondrial
membrane
D) A and C
E) A, B , and C
A)
$1000 - Answer
The correct answer is D!!
 Plant cells have both mitochondria and
chloroplast. ATP is made in both of
these organelles by chemiosmosis.

$2000

All of the following
statements about
NAD+ are true
EXCEPT:
NAD+ is reduced
to NADH during
both glycolysis and
the Kreb’s Cycle
B) NAD+ has more
chemical energy
than NADH.
C) NAD+ can receive
electrons for use in
oxidative
phosphorylation
D) In the absence of
NAD+, glycolysis
cannot function
A)
$2000 - Answer
The correct answer is B!!!
 NAD+ loses an electron (b/c’s oxidized)
to NADH (gets reduced). NADH has
accepted an electron, which means it
has more energy.

$4000
 All
of the
following are
products or
intermediaries in
glycolysis
EXCEPT:
A)
B)
C)
D)
E)
ATP
NADH
FADH2
Pyruvate
Phosphoenolpyruvate
$4000- Answer
The correct answer is C!!!
 FADH2 is created during the Kreb’s
Cycle. FADH2 leaves the Kreb’s Cycle
and carries electrons to the ETC.

$8000

What is the
primary function of
the light reactions
of photosynthesis?
A)
B)
C)
D)
Make energy-rich
glucose from CO2
& H2O
Make ATP &
NADPH
Make NADPH
used in
respiration
Use ATP to make
glucose
$8000 - Answer
The correct answer is B!!!
 The light reactions make the ATP and
NADPH which supply the energy needed
to fuel the Calvin Cycle.

$15,000

As a research
scientist, you
measure the amount
of ATP and NADPH
consumed by the
Calvin Cycle in 1
hour. You find
30,000 molecules of
ATP consumed, but
only 20,000
molecules of NADPH.
Where did the extra
ATP molecules come
from?
A) Photosystem II
B) Photosystem I
C) Cyclic electron flow
D) Noncyclic electron flow
E) chlorophyll
$15,000 - Answer
The correct answer is C!!!
 Cyclic electron flow only makes ATP,
while noncyclic flow makes ATP and
NADPH. The dark reactions require 9
ATP for every 6 NADPH to make
glucose.

$20,000

During aerobic
respiration, which
of the following
directly donates
electrons to the
electron transport
chain at the lowest
energy level?
A)
B)
C)
D)
E)
NAD+
NADH
ATP
ADP + P
FADH2
$20,000 - Answer
The correct answer is E!!
 FADH2 donates electrons further down
the ETC than NADH. This means the
ATP yield for every FADH2 is only about
2 ATP, as opposed to 3 ATP per
molecule of NADH.

$25,000

CAM plants can keep
stomates closed in
daytime, thus
reducing the loss of
water. They can do
this because they:
Fix CO2 into
organic acids at
night
B) Fix CO2 into sugars
in the bundlesheath cells
C) Fix CO2 into pyruvic
acid in the
mesophyll cells
D) Use photosystems
I and II at night.
A)
$25,000 - Answer
The correct answer is A!!
 Since the stomates are closed during
the day, they cannot take in CO2 and
lose O2 during the day. Instead, they
fix CO2 at night when it comes in
through the stomata.

$36,000

When electrons flow
along the electron
transport chains of
mitochondria, which of
the following changes
occurs?
A)
B)
C)
D)
E)
The pH of the
matrix increases
ATP synthase
pumps protons by
active transport
The electrons gain
free energy
The cytochromes
of the chain
phosphorylate ADP
to form ATP
NAD+ is oxidized
$36,000 - Answer
The correct answer is A!!
 As the H+ are pumped from the inner
mitochondrial space through the cristae
into the intermembrane matrix between
the cristae and the outer mitochondrial
membrane, the

$64,000

If photosynthesizing
green algae are
provided with CO2
synthesized with
heavy oxygen (18O),
later analysis will
show that all but one
of the following
compounds produced
by the algae contain
the 18O label. That
one exception is:
PGA
B) PGAL
C) Glucose
D) RuBP
E) O2
A)
$64,000 - Answer
The correct answer is E!!
 The oxygen in photosynthesis is made
from the splitting of water, not from
carbon dioxide.

$125,000

Which of the following
is(are) true of the
enzyme ribulose
biphosphate
carboxylase?
A)
B)
C)
D)
E)
It participates in
the Calvin Cycle
It catalyzes a
phosphorylation
reaction.
It has an affinity
for both O2 and
CO2
A and C are true
A, B, and C are
true
$125,000 - Answer
The correct answer is D!!
 RuBP is necessary for the Calvin Cycle
and can accept both oxygen and carbon
dioxide as discussed in the process of
photorespiration.

$250,000

When H+ are
pumped from the
mitochondrial matrix
across the inner
membrane and into
the intermembrane
space, the result is:
The reduction of
NAD+
B) The restoration of the
NA+/K+ balance
C) The formation of ATP
across the membrane
D) The creation of a
proton gradient
E) The lowering of pH in
the mitochondrial
matrix
A)
$250,000 - Answer
The correct answer is D!!
 Many H+ gather between the inner
membrane and the outer membrane.
There are more protons b/w the two
membranes and they want to move
from high (b/w membranes) to where
they are low (in the inner mitochondrial
matrix)

$500,000

All of the following
are directly
associated with
photosystem I
except:
Harvesting of light
energy by
chlorophyll
B) P700
C) Photolysis
D) Passing electrons
down a chain
A)
$500,000 - Answer
The correct answer is C!!
 Photolysis or the splitting of water
occurs in non-cyclic electron flow to
replaced the electrons lost from
Photosystem II.

$1,000,000

Glycolysis is
believed to be
one of the most
ancient of
metabolic
processes. Which
statement below
least supports
this idea?
A)
B)
C)
D)
E)
If run in reverse,
glycolysis will build
glucose molecules.
Glycolysis neither
uses nor needs O2
Glycolysis is found in
all eukaryotic cells.
The enzymes of
glycolysis are found
in the cytosol rather
than in a membranebound organelle.
Bacteria, the most
primitive of cells,
make extensive use
of glycolysis.
$1,000,000 - Answer
The correct answer is A!!
 Statement A is false and all others
statements are true. Glycolysis does
not require O2 so it occurs in aerobic
respiration and fermentation.

CONGRATULATIONS!
You are officially a
millionaire and a
science expert!