When Frederick Griffith infected mice with S. pneumoniae that lacked a capsule, the mice
A. remained healthy.
B. reproduced quicker.
C. died of pneumonia.
D. became ill but lived.
Answer: A
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Which ocean zone stretches from the intertidal zone to approximately 200m deep?
a. oceanic zone b. abyssal zone c. neritic zone d. aphotic zone
In the diagram below, the gray unit represents _____. The figure shows a blue molecule arranged in the form of a double chain. The gray unit on this figure represents an oval structure which contains unwound and unpaired chains of this molecule. Before and after this unit, the molecule is wound in the form of a double helix. A green unit represents a part of the double helix before the gray unit.
a. RNA b. DNA c. transcription factors d. RNA polymerase e. the promoter
Flowering plants are capable of fertilization in the absence of water because the
A. processes of pollination and fertilization occur in the soil B. pollen tubes deliver the sperm to the eggs C. eggs develop without sperm by parthenogenesis D. Eggs have a structure that aids in their dispersal by wind E. sperm contain large amounts of cytoplasm
Which of the following bases are the same size?
A) G and C B) A and C C) A and G D) A and T