What advantage does phycoerythrin confer upon red algae?
What will be an ideal response?
Phycoerythrin is an accessory pigment that effectively absorbs blue and green light. Since blue and green light penetrate deepest in the oceans but red light does not, the algae would be able to live in deep areas where only blue and green light penetrate.
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Membrane delimited intracellular structures that perform specific functions in cells are called
A. organs. B. organelles. C. tissues. D. systomis.
Which of the following components of the dermis is
incorrectly matched with its usual function? a. blood vessels; nutrient supply b. sweat glands; hormone secretion c. oil glands; lubrication of hair and skin d. hairs; insulation e. receptors; pain
Secretory IgA antibodies are unique because they
A. have unique light chains. B. are Y-shaped molecules. C. are present in the plasma. D. are connected with J chains and short polypeptides to form dimers. E. are present in lymph nodes.
A coelom is a fluid-filled or air-filled space located __________.
a. within the digestive tract b. within the internal organs, such as the vertebrate kidneys c. between the outer surface of the body and the musculature d. between the digestive tract and outer body wall e. anywhere within the body