Ch 1-2 Review: Question Preview (ID: 10787)


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In a controlled experiment, how many variables are changed at a time?
a) none b) one c) at least two d) as many as possible
The positively charged subatomic particles in atoms are
a) protons b) neutrons c) electrons d) ions
A bond formed by the transfer of electrons is
a) covalent bond b) compond c) ionic bond d) solution
Which is an example of a carbohydrate?
a) lipid b) sugars or starches c) DNA or RNA d) a fat or an oil
The group of macromolecules that stores and transmits genetic information is
a) lipids b) proteins c) carbohydrates d) nucleic acids
Which of the following is NOT true about water?
a) hydrogen bonds form between water molecules b) oxygen has a partial negative charge c) it is polar d) hydrogen attracts the shared electrons more than oxygen
A higher pH means
a) a higher concentration of H+ ions b) a higher concentration of OH- ions c) a more acidic solution d) more easily dissolved in water
Compounds that are organic
a) always contain carbon b) always contain oxygen c) are always attracted to water d) are not present in living things
Proteins are polymers made of
a) monosaccharides b) nucleotides c) amino acids d) lipids
Which is a well-tested explanation that unites and explains lots of different scientists' observations and hypotheses?
a) theory b) hypothesis c) inference d) variable
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