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ATI TEAS 7 SCIENCE/BIOLOGY 100 QUESTIONS WITH 100+ CORRECT ANSWERS/A+ GRADE VERSION
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ATI TEAS STUDY GUIDE EXAM
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
Tissues
Categories of Tissues
o Epithelial: Cells are tightly joined. Ex. Skin
o Connective: May be dense, loose, or fatty. Protects and binds body parts. Ex. Bone tissue,
cartilage, tendons, ligaments, fat, blood, and lymph.
o Cartilage: Cushions & provides structural support for body parts. Jelly like base and
fibrous.
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