Which of the following is an extraembryonic
tissue that burrows into and thus attaches to
maternal tissues?
a. the amnion
b. the yolk sac
c. the chorion
d. the blastocyst protein coat
e. the inner cell mass
C
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The reactants of photosynthesis are
A. oxygen and water. B. sunlight and carbon dioxide. C. water and carbon dioxide. D. water and glucose. E. sunlight and chlorophyll.
The role of the postsynaptic neuron in neural communication is to ____
a. release neurotransmitters b. use gated calcium channels c. contain synaptic vesicles d. block the action of neurotransmitters e. receive the signal from the presynaptic cell
The two terms reductional and equational generally refer to which stages of meiosis (I or II)?
What will be an ideal response?
It's the ninth inning, and the bases are loaded. As the pitcher winds up to throw the ball, how does each tissue in his arm contribute to this critical pitch? The ________ of his fingers grips the ball. His ________ sends instructions that trigger his ________ to contract. His ________ provides stability and transmits the force produced.
A. ectoderm; ectoderm; mesoderm; endoderm B. epithelium; ectoderm; mesoderm; endoderm C. epithelial tissue; nerve tissue; muscle tissue; connective tissue D. connective tissue; nerve tissue; muscle tissue; epithelial tissue