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Tag Archives: Biology

Cell Membranes

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A blood cell is placed into a salt-water mixture (70% salt). What is likely to result if the red blood cell’s membrane is permeable to water?

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Pass It Down

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The basic premise of cladistics is organisms that are closely related share a common evolutionary history. The characteristics that are shared by group members and derived from their ancestors are called:

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Stay Back 500 Feet

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A species of desert plant secretes a chemical into the surrounding soil that kills seeds from any other species of plant that attempts to germinate in that area. What is this an example of?

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The Complement System

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Which of the following accurately describes the complement system?

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Switch Hitter

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Which one of the following molecule is amphipathic, with both a hydrophilic and hydrophobic region?

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Layer of the Epidermis

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Which layer of the epidermis is the characterized by a low rate of mitosis and a high concentration of keratin?

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Otter Future

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In a small lake, sea urchins graze upon small grasses that grow on the bottom. After the introduction of an exotic sea urchin, the small grasses became over grazed and absent. To solve the problem, a species of otter is introduced into the lake to predate upon the sea urchins, and the balance between the urchins and sea grasses is restored. What would be the appropriate term for the otter that was introduced?

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Favored Reaction in Thermodynamics

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According to the second law of thermodynamics, which of the following reactions would be favored?

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Primitive Atmosphere

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According to scientists, Oparin and Haldane, which of the following gases were present in the primitive atmosphere?

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Catalyzing Chemical Reactions

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Enzymes are one of the key proteins in cells and facilitate chemical reactions. How does a typical enzyme catalyze a chemical reaction?

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