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.
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.
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Which group of animals represents the surviving dinosaurs?
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Robert Koch's studies on Bacillus anthracis established a sequence of experimental steps to prove that microbes __________.
a. cause disease b. recycle elements such as nitrogen c. produce antiviral compounds d. control insect pests e. can be altered to produce products such as human insulin