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BIO EXAM #1

Practice Test

QuestionAnswer
The diffusion of water molecules across a selectively permeable membrane is? Osmosis
Maintaining a normal blood sugar or blood pH is? Homeostasis
What kind of bond holds the atoms of a single water molecule together? Covalent bonds that are polar
Which of the following are found in the nucleus of an atom? Neutrons and protons
A carbon can form up to ___ bonds with other atoms. 4
The most important physical characteristic of lipids with regard to living organisms is that they? Are hydrophobic
Saturated fatty acids are so named because they are saturated with? Hydrogen
A neutral atom must contain? An equal number of protons and electrons
Is a membranous organelle that chemically modifies and ships proteins to other organelles or out of the cell. Golgi bodies
Red blood cells placed into distilled water will? Swell and rupture as water moves into the cell
What structures move proteins from the ER to the Golgi apparatus? Transport vesicles
What describes the water in sugar-water solution? Solvent
What can diffuse directly across plasma membranes, moving right through the phospholipid bilayer? CO2 and O2
Refers to the inner open space or cavity of a tubular organ, such as of blood vessel or intestine Lumen
High temperatures or changes in pH can permantly disrupt protein structure and function. This is called? Denaturation
Eukaryotic cells differ from prokaryotic cells in that they have a membrane-bound _____ that contains the genetic material. Nucleus
Group of cells that carry out a certain function is? Tissue
A blind experiment is one in which? Subjects do not know if they are in the experiment or not.
The campus occupys? A community
Chemical reactivity and the formation of chemical bonds between atoms is a function of what subatomic particles? Electrons
What is the function of the plasma membrane? Regulation of the passage of material into and out of the cell
Fats are composed of glycerol and ____ which can both be metabolized for the production of ATP. Fatty acids
Which organelle contains digestive enzymes? Lysosomes
The polysaccharide that is a storage form of glucose in the liver and muscle cells in humans is? Glycogen
Proteins that speed up chemical reactions in the body are called? Enzymes
Function of protein synthesis Ribosome
Which of the following is not a disaccharide? Galactose
What are the functions of endoplasmic riticulum? Lipid and steroid synthesis
What is both found in eukaryotic and prokaryotic cells? Ribosomes
How are protons, electrons, and neutrons are arranged into atoms and ions? Protons and neutrons are inside of the nucleus and electrons are outside of the nucleus
What is a ionic bond? Total transfer of electrons forming ions, attraction between ions with opposite charges
What is a hydrogen bond? Occurs between a hydrogen atom and an oxygen atom
What is a covalent bond? Sharing of electron pairs between atoms
What is dehydration synthesis or condensation reaction? Removal of water. (OH from one monomer and H from another)
What is hydrolysis? Water is used to break bond. Enzymes split molecules into two or more parts.
What does DNA stand for? Deoxyribonucleic acid
Definition of denatured. breaking of many of the weak linkages, or bonds (e.g., hydrogen bonds), within a protein molecule.
What are the four levels of structure in proteins. Primary structure, secondary structure, tertiary structure, and quaternary structure.
What is the neutral pH level? (Base) 7.0
Acidic solutions have what level of pH? Greater than 7
Basic solutions have what level of pH? Less than 7
What are the three groups of carbohydrates? Monosaccharide, disaccharide, and polysaccharides
Triglyceride 3 fatty acids + glycerol
Phospholipids Cell membrane component. 2 fatty acids + glycerol + phosphate
Created by: dconti