How did Darwin define the struggle for existence?
a) competition for finite resources among members of a population
b) the presence of successful adaptations
c) descent with modification
d) the development of homologous structures in different species
Ans: a) competition for finite resources among members of a population
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Which of the following statements about nucleotides is (are) true?
A) A nucleotide contains a nitrogenous base. B) A nucleotide contains a pentose. C) A nucleotide contains a phosphate group. D) All of the above statements are true.
Diabetes mellitus translates roughly as "copious urination" + "honey." This disease results from disorders of glucose uptake by systemic cells and can cause, among other symptoms, high levels of glucose in the blood and glucose appearing in the urine (this is what diastix measure). Which of the following is a reasonable explanation of this observation?
A. The reabsorption capacity of the kidney for glucose is exceeded. B. A lack of sodium in the filtrate blocks the function of the Na+/glucose symport protein. C. High levels of glucose interfere with ADH function. D. The high levels of glucose induce a "dehydrated" state that promotes production of a large amount of dilute urine. E. None of the choices given are a logical explanation for this observation.
The eggs of the A. lumbricoides worm are ingested and hatched in the duodenum, penetrate the intestinal wall, and migrate to the hepatic portal circulation. Its geographic distribution and in-fection rate are associated with:
a. institutional crowding. b. poor sanitation. c. day care centers. d. moist warm soil.
The term evolution is used to describe
A. heritable changes in characteristics of a population from one generation to the next. B. any change in an individual that can be observed. C. changes in the number of individuals in a population due to mating. D. the ability of an individual organism to pass on what it has learned, through experience, to the next generation. E. any change in an individual organism that occurs in somatic cells.