The functional group shown above is ____
a. a carbonyl group
b. a hydroxyl group
c. a phosphate group
d. an amino group
e. a carboxyl group
C
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Which of the following is true about the chemical bonds found in proteins and nucleic acids?
A. Covalent bonds result when an electron is completely transferred to another atom such that the atoms are drawn together by electrostatic charges. B. Ionic bonds result when two atoms share electrons equally. C. Atoms having a small difference between their electronegativities are more likely to form covalent bonds. D. Ionic bonds are most likely to form between two metal atoms. E. The strength of a covalent bond can vary with the salt concentration of the environment.
Which groups of archaea are adapted to living in highly salty environments? a. Extreme thermophiles b. All of these choices
c. Methanogens d. None of these choices. e. Extreme halophiles
Cells that contain only circular chromosomes are most probably which of the following?
a. Protist cells b. Fungal cells c. Bacterial cells d. Plant cells e. Animal cells
Which of the following accurately describes energy?
A) something that must be eaten B) something that produces heat C) something that can cause movement D) something that has the capacity to do work E) something that provides sunlight