As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER—RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with:
A. Radioactive isotopes are atoms that are unstable and as a result emit energy in a process called
radioactive decay.
B. Radioactive isotopes are atoms that are stable and as a result emit energy in a process called
radioactive decay.
C. Radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to
higher temperatures.
D. Radioactive isotopes are atoms that are unstable but unless actively disturbed by some chemical
process will remain intact and pose no problems.
A. Radioactive isotopes are atoms that are unstable and as a result emit energy in a process called
radioactive decay.
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Which of the following accounts for the negative control of operons?
a. promoters b. repressors c. structural genes d. operators e. deactivators
Which of the following are sometimes referred to as
rough or smooth depending on structure? a. Golgi bodies b. plasma membrane c. nuclear membrane d. lysosomes e. endoplasmic reticula
Gal4 binding leads to the formation of a multiprotein complex known as the ________, which is an enhanceosome that forms after the activator protein binds
Fill in the blank(s) with correct word
The host provides environment. Microorganisms feed on undigested food. Host feeds on digested food by microorganism. This relationship is known as:
A. mutualism B. Disease C. Colonization D. Commensalism E. Parasitism