Dehydration in animals __________.
a. is always lethal
b. that are exceptionally small, such as the tardigrade, is not usually fatal because of their large surface area-to-volume ratio
c. is, on a cellular level, the opposite of freezing
d. is a problem because fluid-mosaic cell membranes fall apart when deprived of water
e. may be less damaging in the presence of sugar
Ans: e. may be less damaging in the presence of sugar
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The type of biome characteristic of an area depends mainly on rainfall and temperature. Which biome gets the most rainfall?
1.forests 2.grassland 3.shrubland 4.tundra
The selective advantage linked to the high frequency of the cystic fibrosis allele in Caucasians is:
a. an increased resistance to falciparum malaria. b. the prevention of excessive water loss associated with certain types of diarrhea. c. production of an enzyme to break down cholera toxin. d. increased mucous secretions for the removal of infectious cells. e. an increased probability of Salmonella infection.
Which process in Paramecium results in genetic recombination but no increase in population size?
A) budding B) meiotic division C) conjugation D) binary fission
Which of the following best describes the sexual life cycle of bread mold?
A. (1) Multinucleate gametangi are produced and compatible strains undergo plasmogeny, and form (2) a heterokaryotic zygosporangium. (3) Karyogamy of the haploid nuclei takes place to form many diploid nuclei and the zygosporangium develops into a thick-walled zygospore. (4) Meiosis occurs and produces many haploid spores, that (5) are dispersed in air and germinate when finding a suitable environment. B. (1) Multinucleate gametangi are produced and compatible strains undergo karyogamy and plasmogamy, and form (2) a heterokaryotic zygosporangium. (3) Meiosis of the diploid nuclei takes place to form many haploid nuclei and the zygosporangium develops into a thick-walled zygospore. (4) Fusion of haploid nuclei occurs and produces spores, that (5) are dispersed in air and germinate when finding a suitable environment. C. (1) Uninucleate gametangi are produced and compatible strains undergo plasmogeny and form (2) a dikaryotic zygosporangium. (3) Karyogamy forms a diploid nucleus and the zygosporangium develops into a thick-walled zygospore. (4) Meiosis of diploic nuclei occurs and produces four haploid spores, that (5) are dispersed in air and germinate when finding a suitable environment. D. (1) Multinucleate zygosporangia develop thick walls and undergo plasmogamy with compatible strains (2) to form a heterokaryotic gametangium. (3) Karyogamy of the haploid nuclei takes place to form many diploid nuclei and they develop into thick-walled spores. (4) These undergo plasmogamy and produce diploid spores, that (5) are dispersed in air and germinate when finding a suitable environment. E. (1) Multinucleate gametangi with diploid nuclei are produced and compatible strains undergo meiosis (2) to produce a heterokaryotic zygosporangium with haploid nuclei. (3) Karyogamy of these nuclei takes place to form diploid nuclei that have a dark, thick wall. (4) These develop into spores, that (5) are dispersed in air and germinate when finding a suitable environment.