In hydrothermal vent communities, primary productivity is based on
A) bacterial decomposition.
B) herbivory.
C) photosynthesis.
D) chemosynthesis.
E) detritivores
D
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Which of the following is a cure for people with recurrent infection from Clostridium difficile?
A) Renal transplantation B) Genetic restructuring C) Grafting D) Fecal transplantation
Transcription is terminated in prokaryotes by ____
a. generation of a stop codon b. transcription of an mRNA terminator sequence c. splicing introns out and pasting exons together d. generation of a guanine cap e. generation of a poly-A tail
Which statement is true of all protists?
a. They exhibit true multicellularity. b. They are encased in silica-based shells. c. They contain complex organelles and nuclei. d. They live in large colonies of identical protists.
Sperm pass through several stages during their development. The earliest stage in which the cell
becomes haploid is the
a. sperm. b. spermatid. c. primary spermatocyte. d. secondary spermatocyte. e. spermatogonium.