Biologists captured and marked 120 butterflies, and later captured 150 of which 30 were marked. The population
estimate is 1000 butterflies.
Indicate whether the statement is true or false.
ANSWER: False - 600
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A gene has been discovered in the genome of a eukaryote that is identical to a gene of a bacterium that the eukaryote normally engulfs and digests. This is probably due to
A. a mutation of an existing gene in the eukaryote that coindcidentally is the same as the bacterial gene. B. horizontal evolution. C. horizontal gene transfer. D. a mutation of an existing gene in the eukaryote that coindcidentally is the same as the bacterial gene and vertical evolution are correct. E. endocytosis of the bacterium by the eukaryote and insertion of bacterial DNA into the eukaryotic DNA; resulting in vertical evolution.
Why do animal viruses have envelopes and phages rarely do?
A. Since bacteria don't have cell membranes, the bacterial viruses (phages) don't pick them up when they leave the target cells. B. Phages acquire an outer surrounding that is a part of the cell wall of the bacterium they were created in, rather than an outer surrounding of plasma membrane. C. Animal viruses will often utilize the envelope in order to fuse with the plasma membrane of a new target cell, gaining entry into the cytoplasm. D. Animal viruses build the envelope inside of the target cell as they are being replicated, but before the cell breaks open and releases them into the extracellular environment. The envelope is a remnant of this building process.
Which statement about prokaryotic gene expression is true?
a. RNA transcription and protein translation occur almost simultaneously. b. Gene expression is regulated primarily at the epigenetic level. c. Prokaryotic organisms have intracellular organelles. d. RNA post-processing includes the splicing of exons.
Four of the five answers listed below are
functions of parenchyma tissue. Select the EXCEPTION.
a. support b. heal wounds c. store food d. conduct photosynthesis e. secretions