Signaling proteins that alert the immune system an infection is present and that sometimes directly fight pathogens are the:

A) histamines.
B) complement proteins.
C) antibodies.
D) cytokines.
E) antihistamines.


Answer: D

Biology & Microbiology

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In addition to chromosomes, some mitochondria also contain other genetic material known as

A) plasmids. B) transposons. C) proteomes. D) lysosomes.

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The amount of phenotypic variation in a group that is due to genetic variation is called heritability

Indicate whether the statement is true or false

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The main danger from deep vein thrombosis is ____

a. a clot breaking loose and moving elsewhere in the body b. unsightly veins c. loss of blood flow in the extremities d. blood pooling below the heart e. a clot dispersing without warning

Biology & Microbiology

Which statement is true of DNA’s structure?

a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. All four bases in DNA can be found in equal quantities.

Biology & Microbiology