During animal development, a fertilized egg divides to form a ball of undifferentiated cells called a:
A. blastula.
B. gastrula.
C. meristem.
D. zygote.
E. neurula.
A
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Tritiated hydrogen (3H) differs from hydrogen (1H) in that
A. 3H has 2 more protons than 1H. B. 3H has 2 more electrons than 1H. C. 3H has 2 more neutrons than 1H. D. 3H has the same number of neutrons as 1H. E. 3H has a different electron configuration than 1H.
Photosynthesis is ____, while all other processes of life are ____
a. exergonic; exothermic b. endergonic; endothermic c. endergonic; exergonic d. exergonic; endergonic e. exergonic; endothermic
Dissolved sugars are transported in:
a. cork cambium.
b. epidermis. c. pith. d. phloem. e. xylem
The process of using just enough heat to kill most (but not all) of the bacteria that cause spoilage in a beverage was developed by
a) Pasteur. b) Ehrlich. c) Lister. d) Koch.