A phylogenetic tree is:

A. a diagram of the genetics of trees.
B. a diagram of the evolutionary relationships
among groups of trees.
C. a diagram of the evolutionary relationships
of a species.
D. a diagram of the genetics of a species.


C

Biology & Microbiology

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Meningitis can be caused by a number of microbes, and the causative organism is often identified by microscopic observation of the cerebrospinal fluid.  Identify the mismatch in the following list of organisms and the description of the microscopic observation.

A. Listeria monocytogenes; gram-negative coccobacillus with flagella B. Streptococcus pneumoniae; gram-positive flattened coccus C. Neisseria meningitidis; gram-negative diplococcus D. Enterovirus; no bacteria appear to be present in CSF E. Cryptococcus neoformans; fungal cells with a thick capsule

Biology & Microbiology

Vertebrates have four Hox gene clusters that control the anterior-posterior axis. Indicate whether the statement is true or false

Biology & Microbiology

What is the first step in investigating any ecological question?

a) make observations b) make a computer model c) conduct and experiment d) come to a conclusion

Biology & Microbiology

Split genes

A. require spliceosomes to excise introns and then join exons. B. have introns located only at the beginning and end of a coding region. C. are common in prokaryotes and eukaryotes. D. only have exons initially transcribed to mRNA. E. All of these choices are correct.

Biology & Microbiology