Which of the following statements is true regarding atomic mass?
a. The atomic mass can be used to differentiate between different isotopes of the same element.
b. The atomic mass is defined as the sum of electrons and neutrons in an atom.
c. The atomic mass is calculated by adding the total number of electrons, protons, and neutrons in an atom.
d. The atomic mass is synonymous with the atomic number.
Answer: a. The atomic mass can be used to differentiate between different isotopes of the same element.
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The most common isotope of carbon has an atomic number of 6 and a mass number of 12, while the
most common isotope of oxygen has an atomic number of 8 and a mass number of 16. A molecule of CO2 made up of these common isotopes has a molecular weight of ____.
a. 28 b. 44 c. 56 d. 14 e. 22
The secretion of tears, milk, saliva, and earwax is a function of which tissue?
a. epithelial b. loose connective c. lymphoid d. nervous e. adipose
When eukaryotic DNA undergoes replication, DNA helicase opens many sites along the DNA molecule at which DNA replication initiates. These sites are called "origins of replication." In what way does having multiple sites of replication affect the process of DNA replication?
A) It makes the process occur more quickly. B) It allows longer molecules to be generated. C) It ensures that errors in DNA replication never occur. D) It allows proteins to be generated at the same time as DNA.
The disadvantages of using distance methods to construct trees include the fact that:
a. distance methods lack any sort of underlying evolutionary model. b. the assumption is made that similarity is a reflection of homology. c. Both of the above. d. Neither of the above.