You have discovered a new organism that displays bilateral symmetry during its larval stage, radial symmetry as an adult, develops three germ layers during embryonic development, and forms a mouth opposite the blastopore. Which classification for this organism is most likely?
a. Ctenophora
b. Placozoa
c. Echinodermata
d. Cnidaria
c. Echinodermata
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Human chorionic gonadotropin (hCG)
a. is produced by the amnion. b. can be used to reveal pregnancy. c. is stored in the ovaries. d. acts as a hormone signaling menstruation. e. is needed to form the placenta.
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
Which of the following would be an expected long-term change during primary succession on glacial moraines? Check all that apply.
_____ increase in species richness _____ decrease in soil depth _____ increase in soil salinity _____ increase in soil nitrogen _____ alder replaced by spruce
Cells that are the main water-conducting cells of a
plant are a. sclereids. b. tracheids. c. sieve tubes. d. parenchyma. e. all of these.