We use the scientific method every day. Imagine your car doesn’t start one morning before school. Which of these is a reasonable hypothesis regarding the problem? I’m out of gas. A scientific theory explains what we know to this date about a natural event. Which of the following is a theory? There is molecular and biochemical evidence that all organisms are related. Choose the answer that best describes the sequence of the scientific method. observation, hypothesis, experiment, conclusion Which of the following is an example of how living things assimilate energy?
Eating a meal Which one of the following is true about scientific knowledge? Scientific knowledge is not absolute, because the possibility is always held open that new experiments may one day prove it wrong. A tree in your backyard is home to robins, squirrels, beetles, and lichens. Together all these organisms compose a/an: A community Which of the following is the most complex level of organization? Rainforest Because scientists are in the business of investigating nature, scientists function as: society’s eyes and ears on the natural world A theory must be supported by evidence.
A hypothesis does not need to be supported by evidence. Goats can be cloned to provide us with human medicines. The experiments of Louis Pasteur to disprove spontaneous generation illustrate the process of the scientific method. BiosphereAll of the ecosystems of the Earth EcosystemCommunities interacting with non-living elements MoleculeThe building blocks of organelles CellThe first level of organization that we can say is alive PopulationMembers of the same species living in the same area Session 2
Molecules of water stick to each other because: hydrogen bonds form between the hydrogen atom of one molecule and the oxygen atom of another molecule. A measure of the quantity of matter in an object is known as: mass Atoms with eight electrons in their outer shells tend to: be stable and unreactive Nonpolar molecules develop when: both atoms have similar electronegativity. From its atomic number of 10, you can predict that a neon atom: is not chemically reactive. Alpha helices and beta pleated sheets are examples of: secondary structure Butter, which is made from milk fat, tends to be harder at room temperature than most margarines.
If you wanted to make a butter that is softer at room temperature, you should consider: creating more double bonds in the fatty acid chains. Amino acids are monomers used to build: proteins Chitin and cellulose are examples of: structural polysaccharides An atom does not always contains the same number of protons as neutrons. Ionic bonds do not occur through a sharing of electrons functional groups of amino acids. There are three parts to an amino acid: 1. amino group (NH3) 2. carboxyl group (COO) 3. Side chain
Cellulose is the carbohydrate found in plant cell walls. A carbohydrate polymer| polysaccharide| Serve as cell surface receptors| glycoproteins| Transport fats throughout the body| lipoproteins| Found in hair and cartilage| structural proteins| The primary information-bearing molecule of life| DNA| | Session 3 Modifies, stores, and ships proteins| Golgi complex| | Serves as the site of protein synthesis| ribosomes| | A network of membranes studded with ribosomes| rough endoplasmic reticulum| | The “power plants” of the cell| mitochondria| |
The site of lipid synthesis| smooth endoplasmic reticulum| | A component of the plasma membrane that helps to maintain its fluidity is: cholesterol How does glucose enter a cell if levels of blood glucose are high? Insulin molecules bind to glucose receptors, causing cellular responses to take up glucose. Diffusion is a process by which a substance: goes down its concentration gradient. The huge array of capabilities of the plasma membrane are performed by its: proteins The cytoskeleton is an internal scaffolding used for cellular movement.
Plasmodesmata allow plant cells to communicate with each other. Animal cells need oxygen most directly to: produce ATP Cell walls can be found as part of: plant cells, bacteria, fungi, and protists. Cells contain organized structures that perform a specific function. These are known as: organelles Which of the following would be found as part of a plant cell but not an animal cell? Chloroplasts What determines whether a protein will be produced on a “free ribosome” or on one attached to the endoplasmic reticulum? A chemical signal on a protein being produced imple diffusionThe movement of molecules down their concentration gradient without the use of a transport protein facilitated diffusionUses transport proteins to assist the movement of materials down a concentration gradient passive transportMovement of materials across a cell membrane that does not require energy active transportRequires the expenditure of energy to move molecules or ions across a cell membrane endocytosisUses a transport vesicle to bring large materials into the cell exocytosisUses a transport vesicle to release materials to the exterior of a cell Carbohydrate chains serve as the binding sites for many signaling molecules.
Ectoplasm is found just inside the plasma membrane of the cell. Session 4