Immunoglobulins inactivate microbes in all of the following ways except via

A. perforating the microbial cell membrane.
B. binding toxins.
C. linking microbes to complement proteins.
D. opsonization.
E. perforating membranes or binding toxins.


A. perforating the microbial cell membrane.

Biology & Microbiology

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The number of major histocompatability (MHC) protein combinations possible in a given population is enormous. However, an individual in that diverse population has a far more limited array of MHC molecules because _____

A) the MHC proteins are made from several different gene regions that are capable of rearranging in a number of ways B) MHC proteins from one individual can only be of class I or class II C) each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene D) once a B cell has matured in the bone marrow, it is limited to two MHC response categories E) once a T cell has matured in the thymus, it can only respond to two MHC categories

Biology & Microbiology

Scientists discovered that the primary reason leaves either develop as simple or compound is related to:

A. whether the KNOX gene is active or not active B. where the leaf primordium is positioned C. whether auxins are moving in the stem tip D. how fast the KNOX gene arrives at the primordium E. the protein PHANTASTICA and its interaction with auxins

Biology & Microbiology

Explain the ethical concerns with germ-line gene therapy in humans

What will be an ideal response?

Biology & Microbiology

You find a cell of a type you have never seen before. The cell has both a nucleus and a cell wall. Therefore, you conclude that it is likely to be a(n) ________ cell

A) prokaryotic B) animal C) bacterial D) plant

Biology & Microbiology