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2024 BIO 1108 SONORAN DESERT EXAM 3 WITH CORRECT ANSWERS
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2024 BIO 1108 SONORAN DESERT EXAM 3 WITH CORRECT ANSWERS
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2024 BIO 1108 SONORANDESERT EXAM 3 WITH CORRECT
ANSWERS
what is ATP Synthase? - CORRECT ANSWERS-an enzyme (protein) spanning
the thylakoid membrane; H+ ions flow through; passive transport;
continuously converts ADP (low energy) to ATP (high energy) for use in the
calvin cycle
parts of the calvin cycle - CORRECT ANSWERS-1) Fixation - fixation
(reduction) of CO2 into organc C Sugar using Rubisco (enzyme)
2) Reduction - More Reduction (adding energy) to 3c molecules
3) Regeneration - Expulsion of (1/2) of a glucose and return to original form
of 5c Sugar
where does the calvin cycle take place? - CORRECT ANSWERS-in the stroma
what happens during fixation in the calvin cycle? - CORRECT ANSWERS-each
turn, starts with 1 5C molecule (RuBP) and adds 1 CO2 (this addition is
catalyzed by RuBisCo) and makes 2 PGA (3C molecules). This fixes inorganic
C in to Organic C
what happens during reduction in the Calvin Cycle? - CORRECT ANSWERS-
ATP and NADPH power the conversion of one 3C sugar to another (PGA ->
G3P)
what happens in regeneration during the Calvin Cycle? - CORRECT
ANSWERS-G3P is used to make glucose in a process called gluconeogenesis.
The other G3Ps are used to make more RuBP
how many turns does it take to make 1 glucose molecule? - CORRECT
ANSWERS-6 turns
where is the sonoran desert? - CORRECT ANSWERS-united states south west
and Mexico
plants in the desert? - CORRECT ANSWERS-summer is too hot for plants to
grow (95 degrees F), spring is too dry for plants to grow, winter is the only
good growing season for plants, especially annuals
, what percent of earth's biomass do plants make up? - CORRECT ANSWERS-
80%
what is the basic reaction for photosynthesis? - CORRECT ANSWERS-CO2 +
water + light --> glucose + O2
what is osmosis - CORRECT ANSWERS-a process by which water molecules
pass through a semipermeable membrane from a less concentrated [more
dilute] solution into a more concentrated one, thus equalizing the
concentrations on each side of the membrane.
what is the difference between a turgid and flaccid plant cell? - CORRECT
ANSWERS-a turgid cell is full of water causing the vacuole to swell pushing
against the cell wall where as a flaccid cell had an empty vacuole causing
the cell to lose its shape
what is the phloem? - CORRECT ANSWERS-carries dissolved nutrients,
hormones, sugars, etc around a plant in any direction - using osmosis
what is the xylem? - CORRECT ANSWERS-carries water through hollow, dead
cells from roots to leaves only (one directional)
cohesion? - CORRECT ANSWERS-water sticks to other water molecules
adhesion? - CORRECT ANSWERS-water sticks to other molecules
What is the dilemma with gas exchange in the stomata? - CORRECT
ANSWERS-constant gas exchange would be ideal, but water loss occurs
during gas exchange. mostly controlled by a physical process depending on
amount of water in the guard cells
How do guard cells work? - CORRECT ANSWERS-Open when cells are turgid
and water is abundant. closed when water is scare and the cells are flacid
can the stomata be opened other ways? - CORRECT ANSWERS-they can be
forced open using ion flow and hormones
what factors affect the rate of evaporation from the stomata? - CORRECT
ANSWERS-increased temperature = increased evap, increased wind =
increased evap, increased humidity = less evap.
transpiration - CORRECT ANSWERS-evaporation from plants - part of the
water cycle
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