20 questions
Biology starts at the level of ___________ and moves through the study of biospheres.
atoms
cells
organs
organisms
The basic building blocks of matter
atoms
elements
molecules
organisms
A substance that cannot be decomposed into simpler substances by chemical means - made up of the same atoms
atom
element
molecule
organism
An atom that has a different number of neutrons than the standard for that element.
element
isotope
molecule
organism
A group of two or more atoms that are bonded together
elements
isotopes
molecules
essential elements of life
A living thing
element
molecule
isotope
organism
The correct order for the organization of living things is
cell -> tissue -> organ -> organ system -> organism
cell -> atom -> organ system -> organism -> tissue
cell -> atom -> molecule -> organism -> organ system
tissue -> cell -> organism -> organ -> organ system
a major component of genes and proteins
nitrogen
sulfur
iron
oxygen
major part of photosynthesis and respiration
carbon
hydrogen
sulfur
calcium
This element is not found naturally in earth and must be combined with other elements like oxygen.
phosphorus
sulfur
calcium
hydrogen
This element makes up about 63% of the mass of animals and 75% of the mass of plants.
nitrogen
carbon
oxygen
hydrogen
This element is an important part of DNA molecules.
phosphorus
hydrogen
sulfur
iron
This element is abundant in plants and helps the soil break down microbes to make nutrients.
hydrogen
phosphorus
calcium
sulfur
Which of the following elements is the main element in the hard part of bones?
nitrogen
hydrogen
oxygen
calcium
Which element is essential for metabolic processes in the body like the synthesis of proteins used during electron transport for aerobic cell respiration?
iron
calcium
sulfur
phosphorus
Which of the following is NOT a characteristic of living things?
ability to change temperature
ability to move
ability to grow
ability to respond to changes in the environment
Which of the following are characteristics of only living things? Mark all that apply
made of cells
respiration
excretion
made of atoms
All living things have hundreds of cells.
true
false
Living things can be unicellular or multicellular.
true
false
Which of the following are examples of nonliving things? Mark all that apply.
sun
soil
water
cells