Double fertilization in flowering plants refers to ________
a. two sperm fertilizing a single egg
b. two sperm fertilizing two eggs
c. a single sperm fertilizing two eggs
d. a sperm fertilizing an egg and another sperm fertilizing the endosperm mother cell
d
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The largest documented mass extinction on Earth occurred:
A. 252 million years ago. B. 25 million years ago. C. 6.5 million years ago. D. 65 million years ago. E. 650 million years ago.
Which of the following prokaryotic nutritional
groups use organic substances for both carbon and energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. none of these
Telomerase reads ________ as a template and synthesizes ________ as a product
A) DNA; DNA B) DNA; protein C) RNA; RNA D) RNA; DNA E) DNA; RNA
buffer
What will be an ideal response?