The "9 + 0" pattern of microtubules is associated with
A) bacterial locomotion.
B) cyanobacterial locomotion.
C) respiratory tract cilia.
D) sperm tail flagella.
E) primary (sensory) cilia.
Answer: E
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There is an influx of which ion into the synaptic knob triggering the vesicles containing neurotransmitter to move towards the presynaptic membrane
A) calcitonin. B) calcitriol. C) calmodulin. D) calcium E) calcitropin.
If the duration of life on Earth was on a comparative scale of 20,000 days, for how many of those days would the human species be present?
A. 1 B. 100 C. 2000 D. 10,000 E. 20,000
Phytochemicals are
a. essential for survival. b. produced in laboratories exclusively. c. not essential but can prevent some disorders. d. cofactors for cellulose degradation. e. none of these
The process that produces mRNA from DNA is called
A. translation. B. replication. C. post-translational modification. D. transcription. E. processing.