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.
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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
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
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.
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