What is an operon?
A. a short sequence of DNA to which a transcription regulator binds
B. a set of genes that is constitutively active
C. a set of genes transcribed as a single mRNA from a single promoter
D. a sequence of DNA that produces a variety of mRNAs
E. a set of genes controlled by the binding of two or more transcription regulators
Ans: C. a set of genes transcribed as a single mRNA from a single promoter
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If you see a male calico cat, you can be fairly certain that his diploid cells have a sex chromosome combination of
____.
a. XYY b. XY c. XX d. XXY e. XO
Which of the following organelles possess DNA separate from nuclear DNA that can be used to trace genealogies of humans?
a. ribosomes b. chloroplasts c. mitochondria d. lysosomes
The process by which a small amount of the energy in a
glucose molecule is released as it is converted into two small organic acid molecules is a. photolysis. b. glycolysis. c. oxidative phosphorylation. d. substrate-level phosphorylation. e. the Krebs cycle.
Pinocytosis:a
is engulfment of large particles by the cell. b. occurs in protozoans and algae but not in more complex organisms. c. involves the specific binding of molecules to receptors on the cell surface. d. is the nonspecific uptake of fluids by pinching inward of the plasma membrane. e. is movement of molecules against the concentration gradient through a permeable membrane.