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In a laboratory you are responsibly for your own safety as well as the safety of your teacher and classmates
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A chemical bond formed by the transfer of electrons is an ( ) bond
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| Question | Answer |
|---|---|
| In a laboratory you are responsibly for your own safety as well as the safety of your teacher and classmates | true |
| A chemical bond formed by the transfer of electrons is an ( ) bond | ionic |
| Whenever you are working in your biology laboratory, it's important for you to follow ( ) | safety precautions |
| If an atom contains 15 protons it must contain 15 ( ) | electrons |
| Most of the mass of an atom is in the | nucleus |
| When salt is dissolved in water, water is the ( ) | solvent |
| The information you gather during an experiment is called your ( ) | data |
| Which level of organization includes all of the other levels? | Ecosystem |
| Based on his ( ), Redi made a prediction that keeping flies away from meat would prevent the appearance of maggots. | hypothesis |
| "The plant in container A has five offshoots" is an example of a ( ) observation | quantitative |
| Information gathered from observing a plant grow 3 cm over a two week period results in n | data |
| The work of scientists usually begins with | careful observations |
| A controlled experiment allows the scientist to isolate and test | a single variable |
| Is the ability to move a characteristic of all living things? | no |
| Water's ( ) allows it to dissolve compounds such as table salt (NaCI) | polarity |
| A substance made up of only one kind of atom is an element (True or false?) | true |
| Buffers are weak acids or bases that can react with strong acids or bases to prevent sudden changes in pH (True or false?) | True |
| Adhesion is responsible for the surface of the water in a graduated cylinder that is slightly curved at the sides (true or false?) | True |
| The ( ) microscope is generally used in high school laboratories. | Compound light |
| Biology is the study of | the living world. |
| The ability to reproduce results is an important part of any | experiment |
| The nucleus is made up of | protons and neutrons |
| A hypothesis | may be disproved by a single experiment |
| A theory | may be revised or replaced |
| If an atom contains 11 protons and 12 neutrons, its atomic number is | 11 |
| Which of the following characteristics of living things best explains why birds fly south for the winter? | Living things respond to their environment |
| Which of the following is a form of energy that may be released during a chemical reaction? | Sound, light, heat |
| Chemical reactions that ( ) energy will not occur without a source of energy. | absorb |
| What is the term used to describe the energy needed to get a reaction started? | activation energy |
| Which of the following theories are found only in Australia | Theory of evolution and theory of plate tectonics |
| An instrument that allows light to pass through the specimens and uses two lenses to form an image is a ( ) | compound light microscope |
| The space surrounding the nucleus of an atom contains | electrons |
| Which of the following statements about a compound is true? | The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed |
| A water molecule is polar because there is an uneven distribution of electrons between the oxygen and the ( ) atoms. | hydrogen |
| A water molecule is polar because there is an uneven distribution of electrons between the oxygen and the ( ) atoms. | hydrogen |
| Which of the following statements about enzymes in NOT true? | All enzymes work inside cells |
| A substance with a pH of 6 is called | an acid |
| The science that seeks to understand the living world is called ( ) | biology |
| A covalent bond is formed as the result of | sharing an electron pair |
| The process by which organisms keep their internal conditions fairly constant is called | homeostasis |
| A map of eastern north america, showing the pH of rainfall in various states, indicates that the pH of rain in New York State varies from 4.22 to 4.40. According to these figures, the most acidic rainfall in New York state has a pH of | 4.22 |
| Which of the following organic compounds is the main source of energy for living things? | Carbohydrates |
| Whenever you are working in your biology laboratory it is important for you to follow | safety precautions |
| Chemical reactions that release energy are called | exothermic |
| The information you gather during an experiment is called your | data |
| The ( ) microscope is generally used in high school laboratories. | compound light |
| "The plant in container a has five offshoots" is a ( ) observation. | quantitative |
| Hypotheses may arise from | Prior knowledge, logical inferences and informed, creative imagination |
| What is not a goal of science? | to use data to support a particular point of view |
| In the metric system the basic unit of length is the | meter |
| Scientists publish the details of important experiments so that | others can try to reproduce the results, the work can be repeated, and their experiments procedures can be reviewed |
| The elements or compounds produced by a chemical reaction are known as ( ) | products |
| Do scientist work by guessing? | No |
| Identify the reactant(s) in the chemical reaction, CO2 + H2o -> H2CO3 | CO2 and H20 |
| What type if electron is available to form bonds? | Valence |
| The most abundant compound in most living things is | water |
| Complex carbohydrates are to monosaccharides as polymers are to | monomers |
| A compound light microscope | can magnify objects up to 1000 times |
| A substance that accelerates the rate of a chemical reaction is called a | catalyst |
| When enough experimental data support a hypothesis, the hypothesis becomes a | theory |
| Is storing and transmitting heredity a function of proteins? | no |
| Amino acid is to protein as | simple sugar is to starch |
| Which term for a group of organisms of one type living in the same place? | population |
| The name of an enzyme usually ends in | -ase |
| What is the term for the land, water, and air on earth? | biosphere |
| The variable that is deliberately changed is called the dependent variable (true or false) | false |
| Living things can be studied at different levels of organization, from the molecular level to the largest level, the ecosystem. (true or false) | false |
| What is a use of radioactive isotopes? | Can determine the ages of rocks and fossils, can be used to treat cancer and kill bacteria that causes food to spoil, can be used as "tracers" to follow the movements of substances within organisms' |
| What is a compound? | A substance formed by the combination of two or more elements in definite proportions |
| An important goal of a scientist is to use evidence to learn about the natural world (true or false) | True |
| What is a chemical reaction? | The process that changes one set of chemicals into another set of chemicals |
| What is the best reason for using a scanning electron microscope? | Ability to see three-dimensional images of the surfaces of objects |
| Water molecules are polar, with the | oxygen side being slightly negative and the hydrogen side being slightly positive |
| The stomach produces an ( ) to help digest food | acid |
| In chemical reactions, atoms are | rearranged |
| The basic unit of matter is the molecule (true or false) | false |
| When hydrogen and oxygen combine to form water, water is | a product |
| Scientists show the composition of compounds by a kind of shorthand known as a chemical formula (true or false?) | True |
| To observe a small, living organism, a scientist might use a | compound light microscope |
| In science, a hypothesis is useful only if | it can be tested |
| Lipids are important parts of biological membranes and waterproof coverings (true or false?) | true |
| cell specialization in multicellular organisms allows cells to | perform different functions |
| Proteins that speed up the rate of chemical reactions in the cell without requiring high temperatures are antibodies (true or false) | false |
| Safety procedures are important when working | in the laboratory, with animals, and in the field |
| What are RNA molecules made up of? | Nucleotides |
| The combination of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes is called (. ) | metabolism |
| What make sup a molecule of water? | two atoms of hydrogen and one atom of oxygen |
| What process are polysaccharides formed through? | polymerization |
| What type of ion forms when an atom loses electrons? | Positive |
| In science, a theory is a well-tested explanation that unifies a broad range of ( ) | observations |
| A monosaccharide is a | Carbohydrate |
| Most of the mass of an atom is concentrated in the | nucleus |
| The stomach produces an (. ) to help digest food | acid |
| Water's (. ) allows it to dissolve compounds such as table salt (NaCl). | Polarity |
| Complex carbohydrates are to monosaccharides as polymers are to | monomers |
| The subatomic particles that make up atoms are protons, neutrons, and (. ) | electrons |
| The smallest units that are considered to be alive are organisms ( true or false?) | false |
| Enzymes affect the reaction in living cells by changing the | speed of the reaction |
| Microscopes produce images by focusing light rays or beams of cells (true or false) | false |
| When sugar is dissolved in water, the sugar and water are chemically combined (true or false? ) | False |
| The amount of light and temperature are examples of | Factors to which living things respond |
| The subatomic particle that makes up atoms are protons, neutrons, and (. ) | electrons |
| The substances that are present when a chemical reaction begins are the products ( true of false?) | false |
| Solutions that contain concentrations of H+ ions lower than pure water | are bases |
| For a hypothesis to have value, it must be testable (true or false?) | True |
| Because they have the same number of protons and electrons, all isotopes of an element have the same (. ) properties. | Chemical |
| Ice floats on water because | water expands when it freezes |
| You suggest that the presence of water could accelerate the growth of bread mold. This is a | hypothesis |
| A well-tested explanation that unifies a broad range of observations is a | theory |
| Isotopes are atoms of the same element with the same number of protons and | a different number of neutrons |
| Scientists are persuaded by logical arguments that are supported by evidence (true or false?) | true |
| Water is the greatest solute in the world? | false |
| "The bird has brown spots on its wings" is an example of an inference (true or false?) | false |
| Catalysts lower the activation energy of a chemical reaction (true or false?)? | true |
| Science differs from other disciplines such as history and the arts, because science relies on | testing explanations |
| The 3 particles that make up atoms are | protons, neutrons and electrons |
| Characteristic of living things | made of cells, obtain and use energy, grow and develop, reproduce, respond to environment, adapt to environment |
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