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9th Grade Biology Class Flashcards
Flashcards
Biology is commonly taught in 9th grade as an introductory science course. This flashcard set covers the core topics from a typical 9th grade biology class, including cell theory, cell organelles, macromolecules, transport, photosynthesis, cellular respiration, and genetics. Work through all 30 cards to build a solid foundation for exams and quizzes.
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What are the three main principles of Cell Theory?
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Question
What are the three main principles of Cell Theory?
Answer
All living things are made of cells; cells are the basic units of life; all cells come from existing cells.
Question
What is the key difference between prokaryotic and eukaryotic cells?
Answer
Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus.
Question
Give an example of a prokaryotic organism.
Answer
Bacteria.
Question
Give examples of eukaryotic organisms.
Answer
Plants and animals.
Question
What is the function of the nucleus in a cell?
Answer
The nucleus controls cell activities.
Question
Which organelle is responsible for producing energy in the cell?
Answer
Mitochondria.
Question
Where does photosynthesis take place in plant cells?
Answer
Chloroplasts.
Question
What is the role of the cell membrane?
Answer
The cell membrane controls what enters and exits the cell.
Question
What is cytoplasm?
Answer
Cytoplasm is the gel-like fluid surrounding organelles within a cell.
Question
List the four main types of macromolecules found in living organisms.
Answer
Carbohydrates, lipids, proteins, and nucleic acids.
Question
What are enzymes and what affects their activity?
Answer
Enzymes are proteins that speed up chemical reactions. Their activity is affected by temperature and pH.
Question
Why is water essential for life processes?
Answer
Water is necessary for all life processes and acts as a solvent.
Question
What is passive transport and what are some examples?
Answer
Passive transport moves substances across the cell membrane without requiring energy. Examples include diffusion, osmosis, and facilitated diffusion.
Question
What is active transport?
Answer
Active transport moves substances against the concentration gradient and requires energy.
Question
What is the overall equation for photosynthesis?
Answer
6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ + 6O₂
Question
What is the purpose of photosynthesis?
Answer
Photosynthesis converts sunlight into chemical energy.
Question
What is the overall equation for cellular respiration?
Answer
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP
Question
What is the purpose of cellular respiration?
Answer
Cellular respiration converts glucose into ATP (energy).
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What are genes?
Answer
Genes are the units of heredity made of DNA.
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What are alleles?
Answer
Alleles are different forms of a gene.
Question
What is genotype?
Answer
Genotype refers to the genetic makeup of an organism (e.g., BB, Bb, bb).
Question
What is phenotype?
Answer
Phenotype refers to the physical appearance of an organism.
Question
What is a Punnett Square used for?
Answer
A Punnett Square is a tool used to predict genetic inheritance.
Question
Name two patterns of inheritance.
Answer
Dominant/recessive, codominance, incomplete dominance, or sex-linked traits.
Question
What are mutations?
Answer
Mutations are changes in DNA.
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What is genetic variation?
Answer
Genetic variation refers to the differences in DNA among individuals.
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What are some sources of genetic variation?
Answer
Mutations, crossing over, independent assortment, and sexual reproduction.
Question
What is meiosis?
Answer
Meiosis is a type of cell division that produces gametes and increases genetic diversity.
Question
What is the Central Dogma of molecular biology?
Answer
The Central Dogma describes the flow of genetic information: DNA → RNA → Protein.
Question
What is DNA replication?
Answer
DNA replication is the process of copying DNA before cell division.
Question
What is ATP?
Answer
ATP is the main energy molecule used by cells.
Question
What is CER used for in science?
Answer
CER (Claim, Evidence, Reasoning) is used to support answers when explaining scientific concepts or solving problems.
Frequently Asked Questions About 9th Grade Biology Class Flashcards
Is biology a 9th grade class?
Yes, biology is typically taught in 9th grade in most U.S. high schools, making it one of the first science courses students take. The course usually covers foundational topics like cell theory, genetics, and energy processes such as photosynthesis and cellular respiration.
What are the three principles of Cell Theory?
The three main principles are: all living things are made of cells, cells are the basic units of life, and all cells come from existing cells. These principles form the foundation of modern biology.
What is the difference between prokaryotic and eukaryotic cells?
Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus that controls cell activities. Bacteria are a common example of prokaryotes, while plants and animals are made of eukaryotic cells.
What is the equation for photosynthesis and cellular respiration?
Photosynthesis is summarized as 6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ + 6O₂, converting sunlight into chemical energy in chloroplasts. Cellular respiration reverses this: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP, converting glucose into usable ATP energy in the mitochondria.
What is the difference between genotype and phenotype?
Genotype refers to an organism's actual genetic makeup, such as BB, Bb, or bb. Phenotype refers to the physical appearance that results from that genetic makeup. A Punnett Square can be used to predict how genotypes and phenotypes are inherited.
What is the Central Dogma of molecular biology?
The Central Dogma describes the flow of genetic information in a cell: DNA is transcribed into RNA, which is then translated into protein. This process explains how genes, which are units of heredity made of DNA, ultimately determine the proteins an organism produces.
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