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.
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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.
Which of the following is required by plants in the smallest quantity?
A. boron B. potassium C. phosphorus D. nitrogen E. sulfur
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.
______ 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