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