List the types of information animals can sense about their internal environments.
What will be an ideal response?
Animals can sense changes in internal temperature, blood chemistry, tissue damage (received as pain impulses), muscle contraction, blood pressure, and touch.
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Citrate synthase, the first enzyme in the citric acid cycle, is regulated by ATP concentrations. Why is early regulation
of ATP production the most beneficial method for the cell?
a. It is not possible to regulate the last enzyme in a pathway. b. More ATP can be produced before the first enzyme is inactivated. c. ATP production always needs to be maximized. d. Citrate synthase controls the amount of pyruvate produced by glycolysis. e. Regulating early steps conserves cellular fuels.
Serial repetition of segments is a defining characteristic of which worm phylum?
A) Flatworms B) Annelids C) Roundworms D) Segmentation is not a defining characteristic of any of the worm phyla.
The velocity of blood flow is the lowest in capillaries because _____
A) the capillaries have internal valves that slow the flow of blood B) the diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate C) the systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle D) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system
In a wind-pollinated species, which of these floral parts is likely to be inconspicuous or absent?
A. pistils B. stamens C. stigmas D. petals E. receptacle