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
In the chloroplast, sugars are made in a compartment that is filled with a thick fluid
formation of waste products in the form of CO2.
The Calvin cycle involves all of the following except:
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
In a photosystem, clusters of chlorophyll a, chlorophyll b, and carotenoid pigments
function most like
Of the following wavelengths of light, which would you expect to be reflected or
transmitted by chlorophyll a?
directly through the phospholipids of the thylakoid membrane
According to this figure, how do H+ ions make their way from the stroma to the
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?
Which of the following photosynthetic pigments can be found at the photosystem
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
Each preferentially absorbs slightly different wavelengths of light.
How do the reaction centers of photosystem I and II differ?
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.
The Calvin cycle constructs ________, an energy-rich molecule that a plant cell can then
use to make glucose or other organic molecules.
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
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?