The scientist(s) given credit for formulating the "cell theory" is/are

A. Rudolf Virchow.
B. Mathias Schleiden and Theodore Schwann.
C. Robert Hooke.
D. Louis Pasteur.
E. Antony van Leeuwenhoek.


B. Mathias Schleiden and Theodore Schwann.

Biology & Microbiology

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Which of the following are characteristics of biomes? Check all that apply.  

_____  A biome is a large geographical area with distinctive plant and animal groups.  _____  Biomes are only located at certain longitudes and latitudes. _____  The climate and geography of a region determines what type of biome can exist in that region. _____  Each biome consists of only one type of ecosystem. _____  Temperate evergreen forest is one of the major biomes.

Biology & Microbiology

Which of the following is required by plants in the smallest quantity?  

A.  boron B.  potassium C.  phosphorus D.  nitrogen E.  sulfur

Biology & Microbiology

An example of artificial passive immunity would be

A. chickenpox infection, followed by lifelong immunity. B. chickenpox vaccine triggering extended immunity to chickenpox. C. giving a person immune serum globulins to chickenpox virus after exposure to the disease. D. a fetus acquiring maternal IgG to the chickenpox virus across the placenta.

Biology & Microbiology

______ are produced by leukocytes and fibroblasts. It inhibits virus replication and cell division and increases the action of certain lymphocytes that kill other cells.

A) Cytokines B) Interferons C) Chemokines D) TNF

Biology & Microbiology