Which of the following have body fluids with the same overall salt concentration as that of their environment?
a. oysters and sea stars
b. whales and sea lions
c. freshwater fish
d. freshwater amphibians
e. cats and dogs
A; Oysters and sea stars are explicitly mentioned in the text as examples of marine organisms in osmotic equilibrium with the environment. Freshwater fish and amphibians are explicitly mentioned as having a problem with salt loss, and mammals, particularly marine mammals, as having a problem with maintaining water.
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The potential yield
a. is how many fish can be caught in a year. b. is an estimate of the amount of profit fishers can expect. c. is an estimate of the number of pounds of fish or shellfish that may be harvested per year. d. is an estimate of the profit from fish or shellfish that may be harvested per year.
Deafness is caused by recessive mutations in any one of at least five genes. Two deaf individuals have nine children, all of whom have normal hearing. Which of the following can you conclude?
A) The parents have mutations in the same gene. B) The parents have mutations in different genes. C) An epistatic interaction has occurred. D) The mutations are codominant to the normal allele. E) The mutations are incompletely dominant to the normal allele.
What is pleiotropy?
A. A single mutant gene affects one trait. B. Two mutant genes affect one trait. C. A single mutant gene has no affect on an individual's phenotype. D. A single mutant gene affects two or more distinct and seemingly unrelated traits.
Which of the following information provides the strongest evidence to support the evolutionary relatedness between fungi and animals?
A. Some fungi and animals have flagella. B. Molecular data shows a similarity in DNA/RNA base sequences. C. They both possess a cell wall made of chitin. D. Both are heterotrophic.