________ is the pigment produced by melanocytes that gives skin its color

Fill in the blank(s) with correct word


Melanin

Biology & Microbiology

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Nitrifiers are chemolithoautotrophs that use either ________ or ________ as electron donors in a process called nitrification.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Describe the sexual life cycle of bread mold.

A. (1) Multinucleate gametangia 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 gametangia 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 gametangia 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 gametangia 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.

Biology & Microbiology

What is the most diverse bacterial lineage?

a. Proteobacteria b. Chlamydias c. Cyanobacteria d. Gram-positive bacteria e. Spirochetes

Biology & Microbiology

Which phylum includes members with radial symmetry that use their two tentacles to capture prey?

a. Cnidaria b. Ctenophora c. Rotifera d. Nematoda

Biology & Microbiology