In invertebrates, the hairs of taste receptors ____, while those of smell receptors ____
a. directly contact the stimulus; indirectly contact the stimulus
b. are derived from microvilli and contain microfilaments; are derived from cilia and contain microtubules
c. transmit signals to the temporal lobes; transmit signals to the parietal lobes
d. perceive taste and pain stimuli; perceive odors and taste stimuli
e. detect airborne molecules; function as chemoreceptors
ANSWER: b
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Mineral nutrients are actively transported across the endodermis, which means that roots are a continuous sink for ____________. (Select all correct answer options.)
A. O2 B. carbohydrates C. H2O D. CO2
A mutation of a segmentation gene can result in
A. duplication of body parts. B. missing body regions. C. replacement of one body part with another. D. altered expression of homeotic genes. E. A segmentation gene mutation can cause all of these changes.
Some restriction endonucleases cut the DNA in such a way that short, single stranded regions are
created. We call these regions
a. hydrogen-bonding ends b. sticky ends c. tacky ends d. blunt ends e. jagged ends
Active transport pumps typically move solutes from areas of ____ concentration to areas of ____ concentration
a. high; low b. low; high c. neutral; high d. neutral; low e. low; neutral