The potential to produce twice as many offspring from

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The potential to produce twice as many offspring from a single mating. 31. Tadpoles go through major metamorphosis to become frogs. All of the changes are induced by thyroxine. The most likely explanation for such a wide array of effects of thyroxine is: different tissues have thyroxine receptors that activate different signal transduction pathways . 32. The steroid hormone that coordinates molting in arthropods is ecdysteroid . 33. African lungfish, which live in small pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation? Small, stagnant pools do not provide enough water to dilute the toxic ammonia 34. The mechanism by which epinephrine stimulates breakdown of glycogen within liver cells and skeletal muscle cells: provides a specific example of cell communication, involves signal transduction, it requires the action of intracellular proteins/enzymes (such as phosphorylase), its an example of homeostatic mechanism (all of the above) 35. the transfer of fluid from the glomerulus to bowman’s capsule is mainly a consequence of blood pressure in the capillaries of the glomerulus. 36. Testosterone functions inside a cell by binding with a receptor protein that enters the nucleus and activates specific genes. 37. Reabsorption of salts, glucose, amino acids, water and potassium ions occurs in proximal tubules 38. Mature human sperm and ova are similar in that they both have the same number of chromosomes. 39. At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many effects?
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