Who conducted the famous "imprinting" experiment on geese?

A. Raven
B. Mendel
C. Russel
D. Darwin
E. Lorenz


Answer: E

Biology & Microbiology

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Researchers discovered an enzyme in HIV called protease. Once the enzyme's structure was known, researchers began looking for drugs that would fit into the active site and block it

HIV is the virus that causes AIDS. In the mid-1990s, A) vaccination B) denaturation C) allosteric regulation D) competitive inhibition

Biology & Microbiology

All of the following events occur during T-dependent activation of a B cell EXCEPT

A. an antigenic fragment held within an MCH Class II molecule of a dendritic cell binds to a specific T cell receptor on a naïve T-helper cell. B. specific cytokines from the T helper cells stimulate maturation and complete activation of the antigen-stimulated B cell. C. antigen within MCH class II molecule is presented by B cell to an activated T helper cell. D. antigen binds to specific B cell receptor molecules. E. antigen bound to the B cell receptor is internalized and transferred to an MHC class II molecule which then moves to the  plasma membrane. F. There are no exceptions.  All of these events occur during T-depedent activation of B cells.

Biology & Microbiology

Gastrulation is the process by which an embryo becomes three-layered. Indicate whether the statement is true or false

Biology & Microbiology

A substance that increases the concentration of H+ is called a(n) ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology