Primary production minus the energy used by the primary producers for respiration.
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net primary production
Which of the following organisms is most likely to be located at the apex (top) of the
pyramid of biomass?
A. grass
B. grasshopper
C. snake
D. mouse
E. Hawk
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, E. Hawk
This process carried out by prokaryotes converts N2 to NH4+ and is the only
biomechanism that makes N2 available to organisms.
a. Denitrification
b. Nitrogen fixation
c. Metabolic cooperation
d. Bioremediation
e. Fermentation
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b. Nitrogen fixation
Select the correct statement about feedback regulation in endocrine systems.
A. Some homeostatic control systems rely on pairs of negatively regulated hormone
pathways, each counterbalancing the other.
B. All hormones are regulated by negative feedback loops.
C. A hormone cascade pathway involves the hypothalamus, posterior pituitary, and
endocrine gland.
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A. Some homeostatic control systems rely on pairs of negatively regulated
hormone pathways, each counterbalancing the other.
In the ocean and most lakes, a narrow layer of abrupt temperature change.
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, thermocline
Which of the following is true about secondary consumers in an ecosystem?
A. They are eaten by primary consumers.
B. They are fewer in number than are primary consumers.
C. They contain the greatest total biomass in the system.
D. They eat only plants.
E. They are smaller and weaker than are primary consumers.
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B. They are fewer in number than are primary consumers.
In a resting potential, an example of a cation that is more abundant in the cytosol of a
neuron than in the interstitial fluid outside the neuron is:
a. CI-
b. K+
c. Na++
d. Ca++
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b. K+
Releasing and inhibiting hormones secreted by nerve cells of the ________________ regulate
hormones released by the ____________________
a. hypothalamus, anterior pituitary
b. hypothalamus, posterior pituitary
, c. anterior pituitary, hypothalamus
d. thyroid, adrenal gland
e. posterior pituitary, anterior pituitary
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a. hypothalamus, anterior pituitary
All of the following hormones are involved in the uterine cycle except:
A. estrogen
B. LH
C. prolactin
D. progesterone
E. FSH
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C. prolactin
In the nitrogen cycle, the transformation of gaseous nitrogen into nitrogen-containing
compounds is performed primarily by:
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prokaryotes
Acetylcholine released into the junction between a motor neuron and a skeletal
muscle binds to a sodium channel and opens it. The sodium channel is a:
a. voltage-gated sodium channel.
Give this one a try later!
net primary production
Which of the following organisms is most likely to be located at the apex (top) of the
pyramid of biomass?
A. grass
B. grasshopper
C. snake
D. mouse
E. Hawk
Give this one a try later!
, E. Hawk
This process carried out by prokaryotes converts N2 to NH4+ and is the only
biomechanism that makes N2 available to organisms.
a. Denitrification
b. Nitrogen fixation
c. Metabolic cooperation
d. Bioremediation
e. Fermentation
Give this one a try later!
b. Nitrogen fixation
Select the correct statement about feedback regulation in endocrine systems.
A. Some homeostatic control systems rely on pairs of negatively regulated hormone
pathways, each counterbalancing the other.
B. All hormones are regulated by negative feedback loops.
C. A hormone cascade pathway involves the hypothalamus, posterior pituitary, and
endocrine gland.
Give this one a try later!
A. Some homeostatic control systems rely on pairs of negatively regulated
hormone pathways, each counterbalancing the other.
In the ocean and most lakes, a narrow layer of abrupt temperature change.
Give this one a try later!
, thermocline
Which of the following is true about secondary consumers in an ecosystem?
A. They are eaten by primary consumers.
B. They are fewer in number than are primary consumers.
C. They contain the greatest total biomass in the system.
D. They eat only plants.
E. They are smaller and weaker than are primary consumers.
Give this one a try later!
B. They are fewer in number than are primary consumers.
In a resting potential, an example of a cation that is more abundant in the cytosol of a
neuron than in the interstitial fluid outside the neuron is:
a. CI-
b. K+
c. Na++
d. Ca++
Give this one a try later!
b. K+
Releasing and inhibiting hormones secreted by nerve cells of the ________________ regulate
hormones released by the ____________________
a. hypothalamus, anterior pituitary
b. hypothalamus, posterior pituitary
, c. anterior pituitary, hypothalamus
d. thyroid, adrenal gland
e. posterior pituitary, anterior pituitary
Give this one a try later!
a. hypothalamus, anterior pituitary
All of the following hormones are involved in the uterine cycle except:
A. estrogen
B. LH
C. prolactin
D. progesterone
E. FSH
Give this one a try later!
C. prolactin
In the nitrogen cycle, the transformation of gaseous nitrogen into nitrogen-containing
compounds is performed primarily by:
Give this one a try later!
prokaryotes
Acetylcholine released into the junction between a motor neuron and a skeletal
muscle binds to a sodium channel and opens it. The sodium channel is a:
a. voltage-gated sodium channel.
