All organisms in the Animalea Kingdom are:
a. multicellular, prokaryotes, autotrophs
b. unicellular, eukaryotes, autotrophs
c. multicellular, eukaryotes, autotrophs
d. multicellular, eukaryotes, heterotrophs
Ans: d. multicellular, eukaryotes, heterotrophs
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Which of the following describes the function of the madreporite in echinoderms?
a. regulating water flow in the water vascular system b. allowing for slow but powerful movement c. digesting and circulating key nutrients d. facilitating the regeneration of body parts
Each of the following is a correct cell-specific response of Epinephrine–cAMP signaling except
A) liver cell glycogen breakdown to glucose. B) stronger heart muscle contraction. C) stronger smooth muscle contraction. D) inhibition of platelet activation during blood clotting. E) increase in intestinal epithelial cell fluid secretion.
Consider again the discussion of "properties of life" and describe at least three distinct reasons why viruses are not classified as living organisms.
What will be an ideal response?
You are a scientist observing a membrane through which water and some small hydrophobic molecules can freely pass along a concentration gradient from high to low. However, some sugar molecules are too large to pass through the membrane either way without the assistance of passive transport proteins. Additionally, small Na ions and some proteins can pass through the membrane against the concentration gradient, but both require the assistance of active transport proteins. What general type of membrane are you observing?
a. impermeable b. impenetrable c. semipermeable d. completely permeable