Describe the water vascular system of echinoderms such as sea stars
What will be an ideal response?
A typical sea star is an active predator that moves about on tiny, fluid-filled tube feet. Tube feet are part of a water–vascular system unique to echinoderms. Fluid-filled canals extend into each arm, and side canals deliver coelomic fluid into muscular ampullae that function like the bulb on a medicine dropper. When an ampulla contracts, it forces fluid into a tube foot. The increase in internal fluid pressure extends the foot.
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Which of the following could likely play a role in causing cancer?
1.Cells adhere too strongly to one another, causing a tumor to form. 2.Kinase enzymes add phosphates onto proteins that regulate the cell cycle. 3.The cell cycle skips interphase. 4.Checkpoint proteins make cells “commit suicide.”
Which of the following does NOT have an exoskeleton?
a. lobsters b. spiders c. insects d. earthworms e. centipedes
IgE antibodies are best described as
A) a cause of basophil and eosinophil degranulation. B) the antibodies found in body secretions. C) those involved in complement activation. D) the trigger for antibody-dependent cellular toxicity (ADCC). E) the most common type of antibody in the blood during the initial phases of an immune response.
Fat Away prevents ATP from being made by 50)
A) slowing down the Krebs cycle. B) glycolysis from occurring. C) blocking access of H+ to ATP synthetase. D) preventing the conversion of NADH to NAD+. E) lowering body temperature.