ATI TEAS 6 EXAM STUDY GUIDE

Science

Cell

 Cell: basic organizational unit of all living things. One thing in

common is they all have membranes (phospholipids).

 Cell structure organization: All cells contain DNA, and RNA &

can synthesize proteins. Consists of nucleic acids, cytoplasm, and cell

membrane.

o Tissues: Cells that are grouped together

o Organs: Tissues that are grouped together

o Systems: Organs that are grouped together

o Organism: A complete individual

 Nuclear parts of a cell

o Nucleus: contains chromosomes, & regulates DNA of the cell.

Defining structure of eukaryotic cells (they all have nucleus).

Passes genetic traits between generations. Contains nuclear

envelop, nucleoplasm, nucleolus, nuclear pores, chromatin, &

ribosomes.

o Chromosomes: thread like rods of DNA. Short

deoxyribonucleic acid, DNA is the genetic material that stores

information about the plant/animal.

o Chromatin: DNA & Protein makeup chromosomes

o Nucleolus: Proteins, small/round doesn’t have membrane.

Protein synthesis, synthesizes & stores RNA.

o Nuclear envelope: Encloses structures within nucleus. Made of

lipids.

o Nuclear pores: Exchange materials between the nucleus *

cytoplasm

o Nucleoplasm: Liquid like cytoplasm, within nucleus.

Cell Membranes

 Cell Membrane (Plasma membrane): Semipermeable membrane of

lipids and proteins. Made of phospholipid bilayer, hydrophilic ends

of the outer layer facing the external environment, the inner layer

facing inside the cell, hydrophobic ends facing each other.

o Hydrophilic: Water loving, can dissolve water

o Hydrophobic: Hates water, can’t dissolve water

 Selective Permeability

o Selective Permeability with regards to size, charge, and

solubility.

 Cell structure

o Ribosomes: synthesize proteins from amino acids.

o Golgi apparatus: synthesize materials like proteins that are

transported out of the cell. Near nucleus & consists of layers of

membranes.

o Vacuoles: Sacs used for storage, digestion, and waste removal.

One large in plant cells/ Animal cells are small or have

numerous.

o Vesicle: Has membrane, & can move materials within the cell.

o Cytoskeleton: Microtubules that shape and support the cell.

o Microtubules: Part of cytoskeleton & help support cell. Made

of protein.

o Cytosol: Liquid material within the cell. Mostly water & had

floating materials.

o Cytoplasm: Cytosol & organelles found within the plasma

membrane, not within nucleus!

o Cell membrane: Barrier that keeps materials out of cell.

Determines what’s allowed in and out.

o Rough Endoplasmic reticulum: Ribosomes on the surface,

produce & store proteins

o Smooth Endoplasmic reticulum: Helps store lipids & proteins.

o Mitochondrion: Generate ATP, involved in cell growth &

death. Contain their own DNA aside from the one within the

nucleus.

 Functions: Produce energy, cell signaling, cellular

differentiation, cell cycle & growth regulation. Can also

have aerobic respiration.

 Animal Cell Structure

o Centrosome: Mitosis & the cell cycle occur here

o Centriole: Cellular division

o Lysosome: Digests proteins, lipids, and carbohydrates. Help

remove undigested substances.

o Cilia: Appendages that cause a cell to move & can move fluid

o Flagella: Tail like structures that help the cell move. A cell

usually only has one or a few flagella. Longer than cilia.

 Cell Cycle: Cell reproduces, growth cell, duplication of genetic

material, and cell division.

 Cell Differentiation: Helps determine the cell type for each cell,

process is controlled by genes of each cell (zygote). Following the

directions of the genes, a cell builds certain proteins and other

substances to set it apart as a specific type of cell.

 Mitosis: DNA replication & Production of new cells

 IPMAT=Cytokinesis

o Interphase: Cell prepares to divide by replicating genetic &

cytoplasmic material. (G1, S, G2)

o Prophase: Chromatic thickens & nuclear membrane disintegrates.

Centrioles move to opposite sides of the cells, and spindle fibers

form. Mitotic spindle, formed cytoskeleton parts, moves

chromosomes around the cell.

o Metaphase: Spindle moves to the center of the cell. Chromosomes

align in the center.

o Anaphase: Sister chromosomes begin to pull apart. When

separated they’re called daughter chromosomes. Grooves appear in

the cell. Cell begins to furrow.

o Telophase: Spindle disintegrates, nuclear membrane reform, and

chromosomes turn into chromatin. In animal cells membrane is

pinched, in plant cell a new cell wall begins to form. Splits into

two.

o Cytokinesis: Physical splitting of the cell.

Meiosis: Reproduction of gametes zygote

o Prophase I: Parent cell's nuclear membrane begins to disappear,

spindles form

o Metaphase I: Chromosomes line up with homogonous

chromosomes. Crossing over may occur

o Anaphase I: Homogonous chromosomes are separated, so one of

each goes to either side

o Telophase I: Cell separates, cytokinesis occurs

o Prophase II: Almost simultaneous with Telaphase I; new spindles

form and attach to centromeres

o Metaphase II: Chromosomes line up again, and some crossing over

may occur

o Anaphase II: Sister chromatids pulled apart at centromeres, towards

poles

o Telophase II: Cell separates, nuclear membranes form, cytokinesis

occurs

o Interphase: Diploid sex cells have double the normal chromosomes

necessary