science cell structures
Viruses are exceptions to the cell theory, but they have some characteristics of living things. What is one of these characteristics?
They contain genetic material
The increase in insulin levels following an increase in glucose levels in the blood can best be explained by
a feedback mechanism that regulates blood glucose levels
a structure that performs a specialized function within a cell is known as
as organelle
the respiratory system of an elephant functions in a similar way to which organelle in a single celled organism?
cell/plasma membrane
microscopic examination of an animal cell reveals the presence of a plasma membrane but no cell wall. which additional structures would normally be present within the cell
centrioles
which is the correct sequence of historical developments leading to our present knowledge of cells
compound microscope ➡️ cell theory ➡️ electron microscope
If body temperature is too high, some blood vessels increase in size and sweat glands will excrete sweat, resulting in a lower body temperature. These changes are an example of
feedback mechanisms
identify the cell structure that is mainly responsible for releasing energy from food molecules in some single celled organisms
mitochondria
most of the reactions by which energy from carbohydrates is released for use by the call take place within the
mitocondria
which sequence best represents the levels of organization in a paramecium, a single celled organism
organelle ➡️ organism
In a multicellular organism, organs carry out a variety of life functions. In a single-celled organism, these functions are performed by
organelles
a single celled organism can move, ingest, and transport materials within the cell because it has...
organelles
Proteins, starch, and DNA are all similar in that they are all
organic compounds