Which of the following is true of the structure
labeled “B”?
a. It is composed of tubulin subunits.
b. It is composed of actin subunits.
c. It is a microtubule.
d. It is an intermediate filament.
e. It is found in cells that give rise to nails and
hair.
Answer: b
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Which is a reason why most exotic species’ introductions fail?
a. inability of the species to adapt to its new environment b. close oversight by environmental regulatory agencies c. overharvesting of the species for commercial purposes d. limitations on the transportation of invasive species
Pulmonary veins carry ____
a. oxygen-rich blood back to the heart b. oxygen-poor blood back to the heart c. oxygen-rich blood away from the heart d. oxygen-poor blood away from the heart e. oxygen-rich blood to and from the heart
Human's pollution of public water sources includes all of the following EXCEPT ____
a. pesticides b. fertilizers c. carcinogenic chemicals d. radioactive materials e. carbon dioxide
Guard cells control the opening and closing of plant stomata by creating osmotic gradients across their membranes, which are adjusted by regulating the concentration of ________ in their cytoplasm
Fill in the blank(s) with correct word