As we study the past 50,000 years worth of information about species' decline and extinctions around the world
A. we see rapid extinctions, especially of the larger animals, not long after humans arrive in an area.
B. we can make a rough estimate of a population's risk of a local extinction.
C. we see a steady-state rate of extinctions on all continents, only islands show a difference due to climate change.
D. we see huge extinctions, especially of the larger animals, with ice ages and global warming.
E. we see local extinctions that appear random, and then recolonizations from other areas.
A. we see rapid extinctions, especially of the larger animals, not long after humans arrive in an area.
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One way to study a microbial ecosystem is to isolate microorganisms from it and study their properties in laboratory culture
Indicate whether the statement is true or false.
Match the type of microscopy with the appropriate characteristic.
A) uses a laser to view a single plane of a specimen B) detects electrons passing through a specimen C) light passes directly through specimen D) detects electrons deflected from the surface of the specimen E) shows specific molecules F) amplifies variations in density 1) Brightfield 2) Fluorescence 3) Phase-contrast 4) Confocal 5) Transmission electron microscopy 6) Scanning electron microscopy
Which enzyme activity is associated with the proofreading mechanism of DNA polymerase I?
A) 5'-to-3' exonuclease activity B) 3'-to-5' exonuclease activity C) 5'-to-3' polymerase activity D) Both A and B E) All of these
Genes for which of the following may be transferred between Fecal Bacteria?
a. Toxin Production b. Fimbriae c. Capsules d. Hemolysins e. All of the Above