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.

Biology & Microbiology

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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.”

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

Which of the following does NOT have an exoskeleton?

a. lobsters b. spiders c. insects d. earthworms e. centipedes

Biology & Microbiology