Which of the following is true of water
molecules when water becomes ice?
a. the water molecules jiggle more
b. their structure becomes less rigid
c. the water molecules pack less densely
d. hydrogen bonds between water molecules
readily break
e. evaporation of water molecules happens
more readily
C
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The Modern Synthesis of evolution is based on
A. observations of the formation of new species. B. Darwin's ideas and modern concepts of genetics. C. experimental studies of populations performed by Darwin. D. recent concepts of adaptation and reproduction. E. recent developments of DNA replication and PCR machines.
The seed coat is formed by the hardening of the
A. ovule. B. integument. C. endosperm. D. embryo. E. prothallus.
In a flower, the mature male gametophyte is
a(an)
a. pollen grain. b. germinated pollen grain. c. ovule. d. microspore. e. sperm cell
The more a sample can be diluted and yet still react with antigen, the ______ the concentration of antibodies in that sample and the _______ is its titer.
A.) lower; lower B.) higher; lower C.) lower; higher D.) higher; higher