An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?

A) single, double, or triple
B) single and double only
C) single bonds only
D) double bonds only


A

Biology & Microbiology

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Which observations illustrate shared ancestry by anatomical comparison studies? Check all that apply. 

_____ The same structure has evolved to carry out different functions. _____ Different structures evolve in similar ways when subjected to the same selective pressures. _____ A structure becomes vestigial. _____ Structures are found to be homologous.

Biology & Microbiology

All of the following are model organisms whose genomes were sequenced as part of the original

Human Genome Project except

a. Mus musculus (mouse) b. Escherichia coli (bacteria) c. Drosophila melanogaster (fruit fly) d. Caenorrharbditis elegans (nematode) e. Danio rerio (zebrafish)

Biology & Microbiology

PTH functions by ____

a. increasing osteoclast cell activity b. increasing bone formation c. decreasing vitamin D activity d. decreasing reabsorption of calcium by kidneys e. lowering blood calcium

Biology & Microbiology

The MIC is the _____ of a drug that is required to inhibit growth of a microbe.

A) standard dose B) largest concentration C) smallest concentration D) lowest dilution

Biology & Microbiology