How do the structures in primary endosymbiotic algae (i.e. true algae) facilitate its growth in aquatic environments? How is the cell wall of these algae similar or different from the cell wall of plants?
What will be an ideal response?
Algae contain vacuoles, which maintain osmolarity of the cell. A pyrenoid concentrates bicarbonate (HCO3-) and converts it to CO2 for carbon fixation via dark reactions in the cell. The pyrenoid is surrounded by starch bodies for energy storage. The starch is broken down, followed by glycolysis and respiration in the mitochondria.
Algal cell walls are made of sugar molecules, as they are in bacteria, archaea, and other eukaryotes, The Chlamydomonas cell is encased in a cell wall composed predominantly of glycoprotein. Other green algae have cellulose cell walls similar to those of plants.
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Each of the following characteristics is true for both facilitated diffusion and active transport EXCEPT
____.
a. the use of transport proteins is required b. transport proteins are specific for the molecules being transported c. transport proteins can become saturated d. a concentration gradient is present e. the direction of transport is always with the concentration gradient
Which of the following events occurs to a territory-holding male zebra finch when he hears the song of
the male zebra finch that holds the neighboring territory?
a. Cells in the nucleus of his forebrain fire frequently. b. The territory-holding male flies out to drive off the neighboring male. c. Cells in the nucleus of his forebrain do not respond to the song of the neighboring male. d. Testosterone levels in his blood rise measurably. e. The territory-holding male initiates a ritualized threat display that may culminate in an expansion of his territory into the neighbor's land.
According to the above table, the foraging
characteristic that would benefit an animal most in a stable ecology would be? a. A baby garter snake captures and eats a slug. b. A sitter because it would have more trouble adapting to a changing environment c. A forager because it has the ability to adapt quickly. d. Both the sitter and the forager are equally adept in a stable ecosystem. e. All of these would benefit an animal the most.
Which major type of muscle in humans has a primary function in movement?
A) smooth B) cardiac C) skeletal D) endothelial