You are studying a bacterium found in the normal intestinal flora of humans and most other mammals, and are doing an experiment to determine the optimum growth rate of this bacteria. You have inoculated five nutrient broths, and are incubating one broth at each of the following temperatures: 5oC, 25oC, 38oC, 42oC, and 55oC. At which temperature would you predict to see the optimum growth rate?
5oC
25oC
38oC
42oC
55oC
38oC
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Most of the carbon dioxide produced by humans is _____
A) converted to bicarbonate ions by an enzyme in red blood cells B) bound to hemoglobin C) transported in the erythrocytes as carbonic acid D) simply dissolved in the plasma E) bicarbonate ions bound to hemoglobin
Structurally similar receptor tyrosine kinases have been found in all multicellular animals. This
suggests that ________.
a. RTK genes are resistant to mutation b. RTKs evolved relatively early in the history of animals c. RTKs evolved from G proteins d. RTKs cannot be involved in processes vital to animals e. RTKs have evolved independently of each other in animals
As filtrate moves through the ____ in mammals it generally undergoes a dramatic decrease in
osmolarity.
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
When blood calcium levels fall, ____
a. PTH secretion increases b. osteoblast activity increases c. osteoclast activity decreases d. growth hormone activity increases e. calcitonin secretion increases