1
Skin
What type of blood cell is responsible for fighting infections
white blood cell
What is the name of the protein that carries oxygen?
hemoglobin
Who proposed the theory of natural selection
Charles Darwin
Name of the bond that holds amino acids together in a protein
peptide bond
What are the two types of nucleic acids?
DNA and RNA
What is the main structural component of a cell membrane?
phospholipids
Term for movement of substances across the cell membrane without the use of energy
passive transport
What are the four nitrogen bases in DNA
adenine thymine guanine cytosine
What type of microorganisms are bacteria?
prokaryotes
What is the name of the process by which homologous chromosomes exchange genetic material during meiosis?
crossing over
what is the term for organisms that make their own food
autotrophs
What is the term for animals that can regulate their body temperature internally?
endotherms
What is the term for a structure that has no current function but was functional in an ancestor
vestigial structure