A molecule that stimulates an immune system reaction by B cells and T cells is termed a(n)

A. antibody.
B. antigen.
C. substrate.
D. phagocyte.
E. complement protein.


B. antigen.

Biology & Microbiology

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When one species actively prevents another from accessing a resource, it is called:

a. interference competition b. exploitative competition c. scavenging d. interspecific competition e. predation

Biology & Microbiology

A digestive tube is best defined as ________

A) the compartment in which an animal digests its food B) a tube-shaped digestive compartment with either one or two openings C) a tube-shaped digestive compartment that has two openings and through which food moves in one direction D) a digestive compartment that conducts both chemical and mechanical digestion

Biology & Microbiology

A karyotype reveals:

a) the shape of the spindle. b) 23 pairs of chromosomes. c) the number, shapes, and sizes of chromosomes in an individual cell. d) the sex chromosomes but not the non-sex chromosomes. e) the non-sex chromosomes but not the sex chromosomes.

Biology & Microbiology

What mammalian hormone is most similar in amino acid structure to arginine vasotocin in chickens?

A. Oxytocin B. Antidiuretic hormone C. Angiotensin II D. Growth hormone E. Aldosterone

Biology & Microbiology