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44 terms

Chapter 7

PHOTOSYNTHESIS
STUDY
PLAY
produce organic molecules from inorganic molecules.
Photoautotrophs
Most of the food humans eat can be traced back to photosynthetic plants.
Which of the following statements regarding photosynthesis and carbon dioxide is false?
A) manufacture the biosphere's food supply.
B) make organic food molecules from simple raw materials.
C) are autotrophs.
D) sustain themselves without eating.
E) All of the choices are correct.<-answer
Producers
Grana
Chloroplasts contain disklike membranous sacs arranged in stacks called
Stroma
In the chloroplast, sugars are made in a compartment that is filled with a thick fluid
called the
Thylakoid membranes
Where is chlorophyll found in a plant cell?
stomata
CO2 enters and O2 escapes from a leaf via
water
The oxygen released into the air as a product of photosynthesis comes from
Light
What is the source of energy that provides the boost for electrons during photosynthesis?
formation of waste products in the form of CO2.
The Calvin cycle involves all of the following except:
electromagnetic
Sunlight is a type of __________ energy.
electromagnetic
The full range of electromagnetic energy is called the ________ spectrum.
mitochondria that had a mutation for photosynthesis
What is the likely origin of chloroplasts?
Chlorophyll a reflects green light.
Why are (most) plants green?
concentrated in a portion of the leaf tissue called the MESOPHYLL
In most green plants, chloroplasts are
H in glucose and water; O in O2
If you expose a photosynthesizing plant to water that contains both radioactive H and
radioactive O, in which of the products of photosynthesis will the radioactive H and O
show up?
an electron.
A redox reaction involves the transfer of
photon
A packet of light energy is called a
an antenna.
In a photosystem, clusters of chlorophyll a, chlorophyll b, and carotenoid pigments
function most like
green
Of the following wavelengths of light, which would you expect to be reflected or
transmitted by chlorophyll a?
catalyze the incorporation of carbon atoms into RuBP.
Chlorophyll b and carotenoids
formation of waste products in the form of O2
Which of the following is part of the light reaction?
carbon dioxide.
Photosynthetic organisms derive their carbon from
directly through the phospholipids of the thylakoid membrane
According to this figure, how do H+ ions make their way from the stroma to the
thylakoid interior?
The release of energy by the excited electron can be as heat, light, or fluorescence.
Which of the following statements about the absorption of photons by pigment
molecules is true?
chlorophyll a
Which of the following photosynthetic pigments can be found at the photosystem
reaction center?
electrons passing down the electron transport chain.
The energy that excites P680 and P700 is supplied by
shuttle electrons along in a series of redox reactions.
The electron transport chains of the light reactions
H20
The electrons lost from the reaction center of photosystem I are replaced by electrons
from
H20
The electrons lost from the reaction center of photosystem II are replaced by electrons
from
is reduced by NADPH.
Photosystem II
Each preferentially absorbs slightly different wavelengths of light.
How do the reaction centers of photosystem I and II differ?
Are inputs to the photosystems
ATP and NADPH
Potential energy
A concentration gradient is a form of
is embedded in the inner membrane of the chloroplast
The chloroplast ATP Synhase
A fuel for cellular respiration and a starting material for making other organic molecules.
Plants use sugars as
Yes, to supply the plant with the ATP needed to power various cell activities.
Do photosynthesizing plants have mitochondria?
chemical . . . food . . . light
Mitochondria transfer ________ energy from ________ to ATP; chloroplasts transform
________ energy into the chemical energy of ATP.
G3P
The Calvin cycle constructs ________, an energy-rich molecule that a plant cell can then
use to make glucose or other organic molecules.
photorespiration.
The addition of oxygen to RuBP by rubisco to form a two-carbon product that is then
broken down by the cell to carbon dioxide and water defines
is of benefit to the plant since it breaks down rubisco.
Photorespiration
Most of the biomass of the cut trees would be added to the atmosphere as CO2
within a few years.
It has been argued that cutting old-growth forests and replacing them with plantations of
young trees would help to alleviate the threat of global greenhouse warming. What
important fact does this argument ignore?
The greenhouse effect is inversely related to increasing levels of atmospheric CO2.
Which of the following statements about the greenhouse effect is true?
two
Ozone consists of __________ oxygen atom(s).