Vocab
the relative size of things
scale
which is shorter? Mrs. Walden or one meter stick?
one meter stick!!!!
the process of an organism increasing in size and complexity over time
growth
True or false? all cells look the same as one another
false
the basic unit of life
cell
living things such as plants, animals, and bacteria
organisms
which is smaller? the width of human hair or a grain of salt?
human hair
all living things are composed of cells
cellular organization
define multicellular
consisting of many cells
group of organs that work together to form a particular function
organ system
an organism that is too small to be seen with the naked eye
microorganism
which is smaller? a water molecule or a cell?
a water molecule
living things ability to respond to changes in their environment and surroundings, improving their chances of survivial
response to stimuli
what is the difference in structure of a plant cell to animal cell?
plant - rectangular/cube
animal - round/irregular
structure composed of two or more types of tissues that work together to perform a particular function
organ
the tiny structures that make up all living things and are the smallest units able to perform life functions
cells
which is smaller? skin cells or red blood cells?
red blood cells
the ability of a living organism to maintain a stable internal environment despite external changes
homeostasis
the name of the "brain" of the cell that contains DNA
nucleus
group of specialized cells of the same kind that perform the same function
tissues
an example of a tiny organism that is made of a single cell
bacteria
Which is smaller? a micrometer or a picometer?
picometer
the set of chemical reactions that occur within an organism that allow the organism to produce energy, grow, and utilize nutrients
metabolism
what are the three components of cell theory?
1. all living things are made of cells
2. cells are the basic unit of life
3. cells come from other cells
Who used a microscope to look at a slice of cork and saw they were made of hollow structures that he named cells?
Robert Hooke