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
mRNA
copy of DNA
protein (pertaining to DNA)
product
prokaryotic cells
have no nucleus
(all bacteria)
eukaryotic cells
have nucleus
(human, tree, insect)
