Question

1. Which of the following organisms secrete hyperotonic urine (the urine that is hypertonic in relation to the organisms blood) Select all that apply.

a. Freshwater fish. b. Amphibian. c. Shark. d. Mammals. e. Birds

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2. Many endocrine disruptor tend to have slow but very long lasting effects. Based on this, whats do you think endocrine disruptors are doing? (choose one)

a. They are quickly activating proteins already present in the cell and altering their function.

b. They are activating signaling cascades that amplify the effect of a small number of molecules.

c. They are binding hormone-activated transciption factors and thus changing gene expression.

Answer 1

Answer A - Mammals and birds secrete urine that is hypertonic to blood.

This is the strategy for avoiding water loss from the body, as mammals and birds donot have much water availabilty as compared to aquatic animals.

Answer B - They are binding hormone-activated transcription factors and thus changing gene expression.

Endocrine disruptors mimics the original hoemone and binds to their receptors on target cells, thus leading to altering the gene expression.