Glands that lack ducts and secrete hormones are called ________
A) exocrine
B) endocrine
C) scent
D) mammary
B
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Differentiation of cells into specialized cell types ____
a. results in a colony organism b. occurred when distinct species began to cohabitate c. decreases survivability d. requires cell signals affecting gene expression e. requires cell signals affecting gene replication
Effector helper T cells release cytokines only after binding to a(n) ____
a. antigen-presenting dendritic cell b. memory T cell c. complement protein d. MHC-antigen complexes on B cells e. antibody producing B cell
The warmest area of a lake during the summer is the ________.
A. limnion B. hypolimnion C. thermocline D. epilimnion E. benthic zone
Which group consists entirely of multicellular eukaryotic consumers?
A) plants B) protists C) animals D) fungi