Which embryonic structure ultimately forms the digestive tract?

A. archenteron
B. blastopore
C. blastocoel
D. notochord
E. convergence extension


A. archenteron

Biology & Microbiology

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In the diagram of a root tip shown above, the item labeled "5" is the

a. quiescent center. b. zone of cell division. c. zone of elongation. d. root cap. e. zone of maturation.

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Which type of species are adapted to stable, predictable environments?

a. r-selected species b. s-selected species c. k-selected species d. j-selected species

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Water flows over gills in the opposite direction of blood flow in a process known as

A) inhalation. B) respiration. C) diffusion. D) countercurrent exchange.

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Which of the following proteins are required for target cells to interact with hormones?

A) Neurotransmitters B) Response proteins C) Receptors D) Cyclic adenosine monophosphates (AMPs) E) Neuromodulators

Biology & Microbiology