The atomic mass (mass number) of an atom is
determined by the combined masses of its
a. neutrons and protons.
b. neutrons and electrons.
c. protons and electrons.
d. protons, neutrons, and electrons.
e. neutrons, nucleus, and electrons
A
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The combination of freezing and drying is known as:
A) desiccation. B) lyophilization. C) pasteurization. D) tyndallization.
In experiments designed as those of Hershey and Chase (1952), 35S was added to a virus replicating within its bacterial host. The new virions were carefully isolated and used to infect fresh bacterial cells in the absence of any radioisotopes. Where would you expect to find the 35S radioisotope?
A) in the phage ghosts B) in the bacterial matrix proteins C) in the bacterial DNA D) in the nucleic acid of the new virions E) in the protein coat of the new virions
Populations can be described in terms of their diversity and stability
Indicate whether the statement is true or false.
Which statement about the bacterium shown in the image is true?
a. The bacterium has not begun binary fission.
b. The FtsZ ring has already formed.
c. Two identical chromosomes are present.
d. The nuclear envelope has just dissolved.