Earthworms use ________ as their respiratory surface
A) lungs
B) gills
C) their skin
D) tracheae
C
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Microorganisms show differential sensitivity to antimicrobial agents.
Answer the following statement true (T) or false (F)
Each of the following provides evidence that kinetochore microtubule shortening is directly involved in anaphase A chromosome movement to a pole except
A) Stabilization of microtubules with the drug paclitaxel stops chromosome movement to a pole. B) Treatment that accelerates microtubule depolymerization causes chromosomes to move toward the poles more quickly. C) Antibody inhibition of kinesin depolymerization of kinetochore microtubules interferes with chromosome movement to a pole. D) Laser bleaching of labeled kinetochore microtubules indicates they shorten at the kinetochore as the chromosome moves toward a pole. E) All of the above are evidence that kinetochore microtubule shortening is directly involved in anaphase A chromosome movement to a pole.
Echinoderm larvae are ________________, while echinoderm adults are ________________.
a. radially symmetrical; bilaterally symmetrical b. bilaterally symmetrical; radially symmetrical c. aquatic; terrestrial d. segmented; unsegmented e. gastropods; bivalves
Active transport occurs ________ the concentration gradient across a cell membrane.
A. against B. passively against C. toward D. away from E. in between