The chemical bonds that are formed when atoms share electrons equally are called ____
a. polar covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. nonpolar covalent bonds
E
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Which of the following is the correct organizational hierarchy, from largest to smallest, in the hierarchical order of life? (Some levels have been omitted, so you are looking for the correct order.)
A. Biosphere ? Community ? Population ? Tissue ? Organ ? Cell ? Atom ? Molecule B. Ecosystem ? Population ? Community ? Organ system ? Organ ? Cell ? Molecule ? Atom C. Community ? Ecosystem ? Population ? Tissue ? Organ ? Cell ? Organelle ? Atom D. Ecosystem ? Community ? Population ? Organ ? Tissue ? Cell ? Molecule ? Atom
Following its initial activation, how does a G protein become inactivated?
A. The G-protein, a subunit, is digested and recycled. B. It spontaneously loses activity within a few seconds. C. The G-protein, a subunit containing a GTP, eventually reassociates with the G-protein bg dimer. D. The G-protein, a subunit GTP, is hydrolyzed to GDP allowing reassociation of the G-protein a subunit and ?? dimer. E. The receptor becomes internalized.
Which one of the following statements concerning plasmids is true?
A. All plasmids can be transferred between bacteria by conjugation B. Much of the information coded in the plasmid is essential to the survival of the bacteria cell C. Resistance plasmids carry genes for antibiotic resistance D. Resistance plasmids cannot be transferred to other bacterial cells E. Plasmids lack an origin of replication
Small doses of antimicrobial agents are very effective in treating the late stages of Borrelia infection because most of the symptoms result from immune responses
Indicate whether the statement is true or false