unit 1
How many atoms is all matter in the universe made of?
About 100 different types of atoms.
What is a cell?
The cell is the basic structural unit of all living organisms.
What are genes?
Sections of DNA that control a trait. Genes contain coded instructions to build specific molecules in a cell.
Is it possible to determine the age of fossils through science?
Yes it is! Scientists can use properties of some radioactive atoms to calculate the age of animal or plant remains.
What is homeostasis?
Homeostasis is a balanced and stable environment within cells and organisms.
Does matter have mass?
Yes, mass is a measure of how much matter is in an object.
What are made up as cells?
All organisms, including animals and plants, are made up of cells.
What is a pigment?
a molecule that reflects only certain colors of light and absorbs the rest. Pigments have the color of the light they reflect.
What is a species?
A species is a group of organisms that can breed with each other, and produce fertile offspring.
What is one way that plants maintain homeostasis?
An example of plants that maintain homeostasis is when leaves closing their pores to reduce water loss.
Do you know why a code of ethics is so important in science?
Scientists adhere to a set of moral values called ethics. Ethics describe acceptable and non-acceptable behaviors. A non-acceptable behavior is unethical.
What are single-celled organisms?
An organism made up of just one cell. The cells of single-celled organisms are very alike from each other, but also may vary in size.
What is chlorophylls?
Chlorophylls are the molecules that absorb light in photosynthesis. This is also an example of pigment.
What are fossils?
A fossil is preserved remains, mineral replacements, or traces of organisms that lived in the past.
What are behavioral adaptations?
Behaviors or activities performed by an organism that increase its fitness.