Caenorhabditis elegans is a nematode that scientists have shown grows from a single cell into about 1000 cells, of which the same 80 cells die during development through apoptosis. Studying this process in Caenorhabditis elegans has helped scientists identify the genes that regulate similar processes in humans. Which of the following statements is supported by this observation?
A. Caenorhabditis elegans have all of the same genes as humans.
B. Caenorhabditis elegans give live birth like humans.
C. Caenorhabditis elegans and humans have a common ancestor.
D. Caenorhabditis elegans infections in humans trigger apoptosis.
E. Caenorhabditis elegans has the same organs that are present in humans.
C. Caenorhabditis elegans and humans have a common ancestor.
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An sRNA is isolated from a bacterial cell. What would you do to determine whether it is a cis-encoded or a trans-encoded sequence?
A. Analyze the molecular position of hydrogen atoms in the sRNA nucleotides. B. Determine whether the sRNA binds to mRNA or to tRNA. C. Identify whether or not the sRNA sequence is complementary to the coding strand of mRNA gene target. D. Find out if the sRNA acts as a transcriptional or as a translational inhibitor.
All known species of bacteria are described in Bergey's Manual of Systematic Bacteriology
Indicate whether this statement is true or false.
Select the best response to the question. ?What is the purpose of a simple stain?
A) To identify gram-positive bacteria. B) To provide additional information about the cell based on the composition of the cell wall. C) To identify gram-negative bacteria. D) To provide contrast to better illustrate the structure and arrangement of bacterial cells.
Viruses that become established as stable parts of the host cell genome are called
A. virulent. B. lethal. C. temperate. D. potent.