Biology Questions and Answers
Cell Structure
- What is cell theory?
Cell theory asserts that the cell is the
constituent unit of living beings.
Before the discovery of the cell, it was
not recomade of building blocks like cells.gnized that living beings were
The cell thetheories of Biology.ory is one of the basic
- Are there living beings
without cells?
Viruses are considered the only living
beings that doare constituted not have cells. Virusesby genetic material
(DNA or RNA) enwrapped by a protein
capsule. They do not have membranesand cell organelles nor do they have
self-metabolism.
- In 1665 Robert Hooke, an
English scientist, published his
book Micrographia, in which
he described that pieces of
cork viewed under the
microscope presented small
cavities similar to pores which
were filled with air. Based on
later knowledge, of what were
the walls of those cavities
constituted? What is the
historical importance of that
observation?
The walls of the cavitiesHooke were the walls of the plant cells observed by (^)
that form thled to the discovery oe tissue. Tf the cells, a facthe observation (^)
only possible after the invention of the
microscopestablished the term “cell”,e. In that work, Ho now widelyoke (^)
used in Biology, to designate those
cavities seen under the microscope.
- What are the two big
groups into which cells are
classified?
Cells can beprokaryotic. classified as eukaryotic or
Prokaryoticdelimited nucleus. Eu cell is that without akaryotic cells are (^)
those with nucleus delimited by
membrane.
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