Unlike an earthworm’s metanephridia, a mammalian nephron functions in both osmoregulation and excretion. |
receives filtrate from blood instead of coelomic fluid. |
Which process in the nephron is least selective? secretion |
filtration |
which of the following animals generally has the lowest volume of urine production? a shark inhabiting freshwater Lake Nicaragua |
a marine bony fish |
The high osmolarity of the renal medulla is maintained by all of the following except diffusion of salt from the descending limb of the loop of Henle. |
diffusion of salt from the descending limb of the loop of Henle. |
Natural selection should favor the highest proportion of juxtamedullary nephrons in which of the following species? a beaver |
a mouse species living in a desert |
African lungfish, which are often found in small stagnant pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation? The highly toxic urea makes the pool uninhabitable to potential competitors. |
Small stagnant pools do not provide enough water to dilute the toxic ammonia. |
Which of the following is not an accurate statement? Hormones of the same chemical class usually have the same function. |
Hormones of the same chemical class usually have the same function. |
An example of antagonistic hormones controlling homeostasis is epinephrine and norepinephrine in fight-or-flight responses. |
insulin and glucagon in glucose metabolism. |
Growth factors are local regulators that bind to cell-surface receptors and stimulate growth and development of target cells. |
bind to cell-surface receptors and stimulate growth and development of target cells. |
Which hormone is incorrectly paired with its action? ACTH-stimulates the release of glucocorticoids by the adrenal cortex |
insulin-stimulates glycogen breakdown in the liver |
Steroid and peptide hormones typically have in common the location of their receptors. |
their requirement for travel through the bloodstream. |
Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal? a decrease in the thyroid secretion of calcitonin |
hyposecretion of TSH |
Shortly after ingesting a big plate of carbohydrate-rich pasta, you measure your blood’s hormone levels. What results would you expect, compared to before the meal? low insulin, low glucagon |
high insulin, low glucagon |
The relationship between the insect hormones ecdysteroid and PTTH is an example of competitive inhibition of a hormone receptor. |
an interaction of the endocrine and nervous systems. |
Which of the following characterizes parthenogenesis? Specialized groups of cells grow into new individuals. |
An egg develops without being fertilized. |
In male mammals, excretory and reproductive systems share the urethra. |
the urethra |
Which of the following is not properly paired? vas deferens-oviduct |
seminiferous tubule-cervix |
Peaks of LH and FSH production occur during the end of the luteal phase of the ovarian cycle. |
the period just before ovulation. |
During human gestation, rudiments of all organs develop in the second trimester. |
in the first trimester. |
Which of the following is a true statement? The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles. |
The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles. |
For which of the following is the number the same in spermatogenesis and oogenesis? gametes produced in a given time period |
meiotic divisions required to produce each gamete |
Which statement about human reproduction is false? An oocyte completes meiosis after a sperm penetrates it. |
The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules. |
The cortical reaction of sea urchin eggs functions directly in the generation of an electrical impulse by the egg. |
the formation of a fertilization envelope. |
Which of the following is common to the development of both birds and mammals? epiblast and hypoblast |
epiblast and hypoblast |
The archenteron develops into the mesoderm. |
the lumen of the digestive tract. |
What structural adaptation in chickens allows them to lay their eggs in arid environments rather than in water? development of the brain from ectoderm |
extraembryonic membranes |
In an egg cell treated with EDTA, a chemical that binds calcium and magnesium ions, the fusion of sperm and egg nuclei would be blocked. |
the fertilization envelope would not form. |
In humans, identical twins are possible because early blastomeres can form a complete embryo if isolated. |
early blastomeres can form a complete embryo if isolated. |
Cells transplanted from the neural tube of a frog embryo to the ventral part of another embryo develop into nervous system tissues. This result indicates that the transplanted cells were mesenchymal. |
determined. |
In an embryonic vertebrate, the apical ectodermal ridge (AER) is a thickened area at the tip of the bud. The cells of the AER secrete protein signals that promote limb-bud outgrowth, and removing the AER blocks growth of the limb along the proximal-distal axis. How would the forelimb of an embryo develop if the AER was removed early or late in limb development? Early removal of the AER would prevent the formation of many distal structures, whereas late removal of the AER would prevent the formation of a few distal structures. |
Early removal of the AER would prevent the formation of many distal structures, whereas late removal of the AER would prevent the formation of a few distal structures. |
Select the correct statement about embryonic development in a frog. Development from zygote to blastula involves mitotic division, cell movement, and cell growth. |
The reorganization of cell layers during gastrulation allows the layers to interact with each other in new ways. |
The allantois stores nitrogenous wastes in a reptile egg. What is the function of the allantois in human development? The allantois does not play any role in human development, because the placenta mediates the transfer of nitrogenous wastes from embryonic to maternal circulation. |
The allantois helps form the umbilical cord in human development. |
Identify the correct statement(s) about Spemann’s organizer. Spemann’s organizer is the dorsal lip of the blastopore in frog gastrulation. |
Spemann’s organizer is the dorsal lip of the blastopore in frog gastrulation. Spemann’s organizer initiates a chain of inductive interactions in frog development. |
In an embryonic vertebrate, the zone of polarizing activity (ZPA) is a block of tissue located on the posterior side of a limb bud. The ZPA provides information about the anterior-posterior axis of the limb. Cells nearest the ZPA form the most posterior of digits (like our little finger); cells farthest from the ZPA form the most anterior digits (like our thumb). How would a vertebrate forelimb bud develop if it had two zones of polarizing activities, one on the posterior side and one on the anterior side of the bud? The forelimb bud would develop into a hind limb. |
The forelimb bud would develop with extra digits, in a mirror image arrangement to the normal digits. |
What happens when a resting neuron’s membrane depolarizes? There is a net diffusion of Na+ out of the cell. |
The neuron’s membrane voltage becomes more positive. |
A common feature of action potentials is that they cause the membrane to hyperpolarize and then depolarize. |
are triggered by a depolarization that reaches the threshold. |
Where are neurotransmitter receptors located? synaptic vesicle membranes |
the postsynaptic membrane |
Temporal summation always involves inputs that are not simultaneous. |
multiple inputs at a single synapse. |
Why are action potentials usually conducted in one direction? Voltage-gated channels for both Na+ and K+ open in only one direction. |
The brief refractory period prevents reopening of voltage-gated Na+ channels. |
Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal? An EPSP or IPSP is generated in the postsynaptic cell. |
Voltage-gated calcium channels in the membrane open. |
Why is an action potential an all-or-none response to stimuli? Because a typical neuron receives signals through multiple dendrites but transmits signals through a single axon |
Because voltage-gated ion channels open when membrane potential passes a particular level |
What causes the falling phase of the action potential? Select the best answer. The opening of voltage-gated sodium channels |
Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels |
If the membrane potential of a neuron decreases, the membrane potential _____. remains unchanged. |
becomes more positive. |
The plasma membrane of a neuron has voltage-gated sodium and potassium channels. What is the effect of membrane depolarization on these channels? Membrane depolarization opens sodium and potassium channels at the same time. |
Membrane depolarization first opens sodium channels and then opens potassium channels. |
Identify the correct statement(s) about the resting membrane potential of a cell. Potassium (K+) and sodium (Na+) gradients are maintained by active transport in a resting mammalian neuron. |
Potassium (K+) and sodium (Na+) gradients are maintained by active transport in a resting mammalian neuron. Concentration gradients of potassium (K+) and sodium (Na+) across the plasma membrane represent potential energy. |
Wakefulness is regulated by the reticular formation, which is present in the spinal cord. |
brainstem. |
Which of the following structures or regions is incorrectly paired with its function? corpus callosum-communication between the left and right cerebral cortices |
limbic system-motor control of speech |
Patients with damage to Wernicke’s area have difficulty coordinating limb movement. |
understanding language. |
The cerebral cortex plays a major role in all of the following except foot-tapping rhythm. |
circadian rhythm. |
After suffering a stroke, a patient can see objects anywhere in front of him but pays attention only to objects in his right field of vision. When asked to describe these objects, he has difficulty judging their size and distance. What part of the brain was likely damaged by the stroke? the corpus callosum |
the right parietal lobe |
Injury localized to the hypothalamus would most likely disrupt executive functions, such as decision making. |
regulation of body temperature. |
Identify the role(s) of glia in the vertebrate brain. Glia release neurotransmitters. |
Glia release neurotransmitters. Glia protect the nervous system from pathogens. Glia guide neuron migration during development of the CNS |
Which examples correctly illustrate the cooperation between the motor and nervous systems to maintain homeostasis in a vertebrate body? A drop in body temperature leads to shivering and constriction of surface blood vessels. |
A drop in body temperature leads to shivering and constriction of surface blood vessels. |
Which of these observations illustrate the developmental plasticity of the human nervous system? When activity at a synapse correlates with the activity of other synapses, that synaptic connection is reinforced. |
When activity at a synapse correlates with the activity of other synapses, that synaptic connection is reinforced. A person suffering from phantom limb pain following amputation may stop feeling pain after viewing a reflection of the remaining limb in a mirrored box. |
Identify the correct statement(s) about glial cells and their functions. Oligodendrocytes act as stem cells, producing neurons and glia. |
Astrocytes induce the formation of the blood-brain barrier. |
Which of these observations illustrate regional specialization in the human nervous system? Reading a printed word out loud and then thinking of a related word involves the visual cortex, Broca’s area, and the frontal and temporal lobes. |
Reading a printed word out loud and then thinking of a related word involves the visual cortex, Broca’s area, and the frontal and temporal lobes. Sensory information may be processed in the occipital lobe or the temporal lobe. |
unit 5 mastering biology
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