All of the following are animal mechanisms to cope with the problem of water balance except
A. secretion of regulatory hormones into the tubule.
B. passage of water and waste of the body across a layer of cells into a tubular structure.
C. kidneys used as filtering organs.
D. being an osmoconformer
E. coupling of water/salt removal with metabolic waste removal.
Answer: D
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Questions 72–76 refer to the five RNA codons listed below:a
AUG b. UAA c. UUU d. UUA e. AAA D 72. This codon terminates a coding region. D 73. The anticodon AAA pairs with this codon. M 74. A single mutation involving the second letter of codon AUA could convert it to this codon. D 75. A DNA codon of ATT is complementary to this RNA codon. D 76. This codon codes for an amino acid and indicates the beginning of a coding region.
the illustration above to answer questions 16–19
E 16. Which structure is a dorsal,hollow nerve tube? a. A b. B c. C d. A and B e. none of these
In response to injury, cell fragments called platelets get activated to induce clotting. Activated platelets release factors that can in turn bind to specific membrane receptors on nearby cells. What type of signaling would this be considered?
A. Direct contact B. Synaptic C. Paracrine D. Endocrine E. Autocrine
Although the carrying capacity of a population is determined by food availability, what other factor affects the carrying capacity?
A) the energy fluctuations of the sun B) clean air and water C) the prevalence of war D) a woman's choice to not have children