Ch. 5 Coping With Environmental Variation: Energy Flashcards

1
Q

___ is the most basic requirement for all organisms.

A

Energy

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2
Q

Sunlight is ___ energy.

A

Radiant

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3
Q

___ energy is stored in the bonds of food molecules.

A

Chemical

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4
Q

___ energy is a form of potential energy.

A

Chemical

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5
Q

___ energy associated with movement of molecules is measured as temperature.

A

Kinetic

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6
Q

Autotrophs -

A

Organisms that assimilate energy from sunlight or from inorganic compounds

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7
Q

Photosynthesis -

A

Organisms assimilating energy from sunlight

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8
Q

Chemosynthesis -

A

Organisms assimilating energy from inorganic compounds

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9
Q

Heterotrophs -

A

Obtain their energy by consuming energy-rich organic compounds from other organisms

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10
Q

Detritivores -

A

Consume non-living organic matter

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11
Q

___ and ___ are heterotrophs that consume live hosts, but do not necessarily kill them.

A

Parasites and herbivores

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12
Q

___ are heterotrophs that capture and consume live prey animals.

A

Predators

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13
Q

Holoparasite -

A

Have no photosynthetic pigments and obtain all their energy from other plants

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14
Q

Hemiparasite -

A

Photosynthetic, but obtains nutrients, water, and some of its energy from the host plant

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15
Q

Some animals can become photosynthetic by acquiring or consuming photosynthetic organisms, or living in a close relationship called ___.

A

Symbiosis

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16
Q

Electrons are used to generate two high-energy compounds:

A

ATP and NADPH

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17
Q

The biochemical pathway used most commonly to fix CO2 is the ___ ___, catalyzed by several enzymes.

A

Calvin cycle

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18
Q

Important chemosynthesizers include the __ __.

A

Nitrifying bacteria

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19
Q

Photosynthesis has two major steps:

A

Light reaction

Dark reaction

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20
Q

Light harvesting is accomplished by ___ and accessory pigments.

A

Chlorophyll II

21
Q

In plants, the thylakoid membrane is part of a specialized organelle called a ___.

A

Chloroplast

22
Q

__ is the most abundant enzyme on earth.

23
Q

Atmospheric O2 led to formation of an __ __ high in atmosphere that shields organisms from high-energy ultraviolet radiation.

A

Ozone layer

24
Q

___ ___ ___ shows relationship between light levels and photosynthesis rate.

A

Light response curve

25
___ ___ ___ is light level at which CO2 uptake is just balanced by CO2 loss by respiration.
Light compensation point
26
Morphological changes are associated with acclimatization:
At high light levels, leaves are thicker and have more chloroplasts than leaves grown in low light At low light levels, leaves are thinner and larger; increasing their surface area for greater light capture
27
Photoinhibition -
Excess energy generates toxic oxygen compounds that damage membranes
28
Carboxylase reaction
CO2 is taken up, sugars are synthesized, and O2 is released
29
Oxygenase reaction
O2 is taken up, leaving to breakdown of carbon compounds and release of CO2
30
__ results in a net loss of energy.
Photorespiration
31
Secondary metabolites
Herbivores tend to eat new growth with the highest nitrogen content and least harmful chemicals that protect plant
32
Plants that lack specialized biochemistry use the __ __ __.
C3 photosynthetic pathway
33
If atmospheric CO2 is low and ___ high, photosynthetic energy gain may not keep pace with photorespiratory energy loss.
Temperatures
34
The __ ___ __ reduces photorespiration.
C4 photosynthetic pathway
35
Most C4 plants have lower rates of transpiration at a given photosynthetic rate, known as ___ ___ ___.
Water use efficiency
36
C4 species are concentrated in ___, ___, and ___ latitudes.
Tropics, subtropics, and temperate latitudes
37
Some plants have a unique photosynthetic pathway that minimizes water loss -
Crassulacean acid metabolism (CAM)
38
Facultative CAM
Plants that can switch between C3 and CAM
39
Detritus -
Organic material derived from dead organisms
40
Fiber -
Includes compounds such as cellulose, but it is a poor energy source because most heterotrophs canning break it down
41
___ have the most energy per gram.
Fats
42
Absorptive heterotrophy -
Digest food outside their bodies and absorb nutrients
43
This ability of bacteria is exploited in ___.
Bioremediation
44
Variation in ___ ___ reflects adaptations that help to optimize food acquisition and minimize competition among groups of birds.
Bill morphology
45
Coprophagy -
Reingest their feces to enhance digestion
46
___ have a specialized stomach compartment in which large populations of bacteria facilitate the breakdown of cellulose.
Ruminants
47
Rumination -
Regurgitation of material from a fore stomach for additional chewing
48
___ can adjust their digestive morphological and produce different digestive enzymes.
Omnivores