How are the chromosomes of a eukaryote cell replicated?
a. The linear DNA molecules are replicated from multiple origins of replication
bidirectionally.
b. The linear DNA molecules are replicated from one origin of replication bidirectionally.
c. The circular DNA molecules are replicated from multiple origins of replication
bidirectionally.
d. The circular DNA molecules are replicated from one origin of replication bidirectionally.
e. The linear DNA molecules are replicated from one origin of replication unidirectionally.
A
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In sponges, the cells responsible for generating water currents that facilitate gas exchange and nutrition are the
A. choanocytes. B. spicules. C. mesohyl. D. sperm. E. symbionts
An Italian physician, ________, challenged the concept of spontaneous generation by demonstrating that maggots do not arise from decaying meat but rather from developing fly eggs.
Fill in the blank(s) with the appropriate word(s).
Which of the following genetic problems is
NOT being addressed by gene therapy?
a. Down syndrome b. cystic fibrosis c. hemophilia d. immune disorder e. cancers
Dead or damaged cells are replaced by the process of ________.
A. mitosis B. meiosis C. binary fission D. fertilization