What kinds of molecules pass through a cell membrane most easily?
A) large and hydrophobic
B) small and hydrophobic
C) large polar
D) ionic
B
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What type of fertilization occurs during sexual reproduction in rotifers?
a. internal b. external
In the process of transcription, incoming RNA nucleotides are in their triphosphates form
__________________ Indicate whether the statement is true or false.
Recent theories on the biological need for IgE as an:
A. Apoptosis causing agent B. Antiviral agent C. Antibacterial agent D. Antifungal agent E. Anti-helminthic
According to the operon model, for the synthesis of an inducible enzyme to occur, the
A) end-product must not be in excess. B) substrate must bind to the enzyme. C) substrate must bind to the repressor. D) repressor must bind to the operator. E) repressor must not be synthesized.