All 7th Sci 1
All 7th Sci 2
All 7th Sci 3
All 7th Sci 4
All 7th Sci 5
100
An uncharged atom has six electrons. The nucleus of this atom must contain _______ protons.
A. eight
B. seven
C. six
D. five
C. six
100
What state of matter is best represented by the diagram below?
A. solid
B. liquid
C. gas
D. all of these
A. solid
100
The digestive system is critical to maintaining a healthy body because
A. the body expels all of its waste using the digestive system.
B. the digestive system helps make food taste better.
C. the digestive system collects the nutrients needed by the body.
D. the digestive system is the primary way the body obtains oxygen.
C. the digestive system collects the nutrients needed by the body.
100
Phytoplankton are single-celled, photosynthetic organisms living at the surface of the ocean. How do phytoplankton affect the Earth's carbon and oxygen cycles when they perform photosynthesis?
A. They add both carbon dioxide and oxygen to the atmosphere.
B. They add carbon dioxide to and remove oxygen from the atmosphere.
C. They remove both carbon dioxide and oxygen from the atmosphere.
D. They add oxygen to and remove carbon dioxide from the atmosphere.
D. They add oxygen to and remove carbon dioxide from the atmosphere.
100
The United States Environmental Protection Agency (EPA) has developed several programs to help reduce greenhouse gas emissions and, ultimately, global warming. The SmartWay Transport Partnership targets greenhouse gas reductions in the freight industry. The Combined Heat and Power Partnership focuses on power generation industries. Programs like Clean School Bus USA and the Green Vehicle Guide focus on transportation.
Based on the information above,
A. humans cannot do anything to reduce global warming.
B. efforts to reduce global warming involve many different human activities.
C. only cars and trucks cause global warming.
D. global warming can be reduced only by using solar power.
B. efforts to reduce global warming involve many different human activities.
200
The atomic symbols of nitrogen and oxygen are N and O, respectively. The chemical formula of a particular substance is NO2. Which of the following is a correct description of the substance?
A. an element made up of 1 nitrogen atom and 1 oxygen atom
B. a compound made up of 2 nitrogen atoms and 2 oxygen atoms
C. an element made up of 2 nitrogen atoms and 2 oxygen atoms
D. a compound made up of 1 nitrogen atom and 2 oxygen atoms
D. a compound made up of 1 nitrogen atom and 2 oxygen atoms
200
What is the function of the cytoplasm?
A. It is where most of the organelles of the cell are located.
B. It contains structures which help support the cell.
C. It is the site of most chemical reactions in the cell.
D. all of these
D. all of these
200
Adaptations are unique traits developed by organisms to help them survive, thrive, and reproduce in their particular environment. Adaptations may be structural or behavioral. Which of the following is an example of a behavioral adaptation?
A. the long neck of a giraffe
B. the shallow roots of cacti
C. the migration of birds
D. the webbed feet of ducks
C. the migration of birds
200
A _______ is a segment of DNA that carries a single unit of hereditary information.
A. sugar
B. chromosome
C. gene
D. nucleic acid
C. gene
200
_______________ may be natural or synthetic and are used in medical applications to support, enhance, or replace damaged tissue or a biological function (Ex. prosthetic arm or hearing aid).
Biomaterials
300
Which of the following best describes the difference between a mixture and a pure substance?
A. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom.
B. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.
C. A mixture has the same properties throughout; a pure substance has the different properties throughout.
D. A mixture has different properties throughout; a pure substance has the same properties throughout.
D. A mixture has different properties throughout; a pure substance has the same properties throughout.
300
_______ is the passive movement of water molecules across a cell membrane.
A. Meiosis
B. Respiration
C. Diffusion
D. Osmosis
D. Osmosis
300
Offspring that are produced through sexual reproduction are usually similar, but never identical, to their parents. This is because
A. genes mutate during every occurrence of sexual reproduction.
B. half of the offspring's genes come from one parent while the other half comes from the other parent.
C. genes are not transferred between parents and offspring during sexual reproduction.
D. all of the offspring's genes only come from one parent or the other.
B. half of the offspring's genes come from one parent while the other half comes from the other parent.
300
What is produced by the process of meiosis?
A. Cells that are exact copies of all the other daughter cells.
B. Cells that contain half of the number of chromosomes present in the parent cell.
C. Cells that contain the exact number of chromosomes present in the parent cell.
D. Cells that are an exact copy of the parent cell.
B. Cells that contain half of the number of chromosomes present in the parent cell.
300
When heated, calcium carbonate goes through a chemical reaction, and produces calcium oxide (quick lime) powder and carbon dioxide gas. A chemist performed this reaction in a lab and found that the mass of the calcium oxide (quick lime) was less than the mass of the calcium carbonate. What is the reason behind this decrease in mass?
A. Carbon dioxide is produced, and as a gas, it was not captured to measure its mass.
B. The calcium oxide crystals produced were unstable and lighter in mass.
C. The carbon dioxide molecules produced were unstable and lighter in mass.
D. Calcium oxide crystals produced break up at room temperature, leading to the difference in mass.
A. Carbon dioxide is produced, and as a gas, it was not captured to measure its mass.
400
In a chemical reaction, atoms are rearranged to form new molecules. However, atoms are neither created nor destroyed.
What happens to the total mass of the atoms involved in a chemical reaction?
A. It always changes as the atoms are rearranged into new molecules.
B. It will stay the same no matter how the atoms are rearranged.
C. It will increase if a new compound is formed during the reaction.
D. It will decrease if two molecules combine to form a single compound.
B. It will stay the same no matter how the atoms are rearranged.
400
What group is entirely unicellular?
A. eukaryotes
B. organisms
C. prokaryotes
D. fungi
C. prokaryotes
400
While playing soccer, Jim falls down and scrapes his knee. Which form of cell division will result in the repair of the damaged skin tissue?
A. meiosis
B. replication
C. mitosis
D. translation
C. mitosis
400
Cystic fibrosis is a recessive genetic disorder caused by a mutation of the CTRF gene. The disease is characterized by excessive mucus production along the respiratory and digestive tracts in addition to other symptoms. Cystic fibrosis is a progressive disorder that is most associated with chronic respiratory disease.
Sara and Anthony found out that they are both carriers of the disorder, but neither have the disease. What are the chances their child will be born with cystic fibrosis?
A. 0:4
B. 1:2
C. 4:4
D. 1:4
D. 1:4
400
The egg cells of a dog have 39 chromosomes each. How many chromosomes does each of the dog's body cells have?
A. 78
B. 156
C. 39
D. 0
A. 78
500
Which of the following best describes a way in which the periodic table is organized?
A. Elements are organized by weight with heavy elements listed above light elements.
B. Elements are organized in alphabetical order.
C. Elements are organized with nonmetals on the left and metals on the right.
D. Elements are organized into groups with similar properties.
D. Elements are organized into groups with similar properties.
500
Venoms come from reptiles such as snakes, fishes, amphibians, insects and spiders, starfish and sea urchins, sea anemones, jellyfish and corals. This is an example of _________________ adaptations.
Physiological
500
All living things need energy to perform their life processes. How and where do they get the energy that they need?
A. the fixation of nitrogen gas from the atmosphere
B. the breakdown of food through the process of cellular respiration
C. the absorption of light that radiates from the Moon
D. the production of carbon dioxide through the process of photosynthesis
B. the oxidation of food through the process of cellular respiration
500
Which of the choices below is one of the primary gases found in the atmosphere?
A. argon
B. oxygen
C. helium
D. carbon dioxide
B. oxygen
500
Which of these is the main difference between aerobic respiration and anaerobic respiration?
A. Anaerobic respiration does not require oxygen.
B. Anaerobic respiration does not produce ATP.
C. Anaerobic respiration does not consume glucose.
D. Anaerobic respiration does not release energy.
A. Anaerobic respiration does not require oxygen.