introduction Flashcards
atom
the smallest unit of an element that retains the elements properties.
ex: oxygen, hydrogen, neon, helium
molecule
two or more joined atoms of the same or different elements.
ex: oxygen (O2), methane (CH4)
cell
the smaller functional unit of living organisms.
ex: skin cells, nerve cells, lymphocytes
tissue
a group of cells and substances interacting in a specialized activity.
ex: muscle tissue –> movement
organ
a structural unit made of two or more tissues interacting for specific task.
ex: heart, liver, pancreas, kidney, eye
organ system
organs interacting physically, chemically, or both in specific task.
ex: integumentary system, skeletal system, muscular system
multi-cellular organism
an organism made of different types of cells.
ex: human, tree, fish, grass, insect
uni-cellular organism
an organism of a single cell
ex: bacteria, and yeast
how many chromosomes are (usually) inside a person?
46 chromosomes per person
XY ?
male
XX ?
female
when forming a child, how many chromosomes come from EACH parent?
23 comes from mom, 23 comes from dad.
There are Genes in chromosomes, true or false?
true
DNA
genetic information
