Which of the following is common to both avian and mammalian development?
A) holoblastic cleavage
B) epiblast and hypoblast
C) trophoblast
D) yolk plug
E) gray crescent
Answer: B) epiblast and hypoblast
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Who demonstrated the possibility of producing organic compounds from gases and water if the mixture is exposed to sparks from an electrode?
a. Platt b. Thompsen c. Miller and Urey d. Pauling e. Starr
Each species in a community has its own __________, or way of living. Fill in the blank(s) with the appropriate word(s)
The sequence of nitrogen-containing bases on one strand of DNA could determine all of the following EXCEPT the sequence of
A) nitrogen-containing bases in mRNA. B) nitrogen-containing bases in the other DNA strand. C) ribose and phosphate molecules in tRNA. D) amino acids in a protein molecule.
What is the explanation for the mass extinction episode that brought about the demise of the dinosaurs?
What will be an ideal response?