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9th Grade Biology Class 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?
All living things are made of cells; cells are the basic units of life; all cells come from existing cells.
What is the key difference between prokaryotic and eukaryotic cells?
Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus.
Give an example of a prokaryotic organism.
Bacteria.
Give examples of eukaryotic organisms.
Plants and animals.
What is the function of the nucleus in a cell?
The nucleus controls cell activities.
Which organelle is responsible for producing energy in the cell?
Mitochondria.
Where does photosynthesis take place in plant cells?
Chloroplasts.
What is the role of the cell membrane?
The cell membrane controls what enters and exits the cell.
What is cytoplasm?
Cytoplasm is the gel-like fluid surrounding organelles within a cell.
List the four main types of macromolecules found in living organisms.
Carbohydrates, lipids, proteins, and nucleic acids.
What are enzymes and what affects their activity?
Enzymes are proteins that speed up chemical reactions. Their activity is affected by temperature and pH.
Why is water essential for life processes?
Water is necessary for all life processes and acts as a solvent.
What is passive transport and what are some examples?
Passive transport moves substances across the cell membrane without requiring energy. Examples include diffusion, osmosis, and facilitated diffusion.
What is active transport?
Active transport moves substances against the concentration gradient and requires energy.
What is the overall equation for photosynthesis?
6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ + 6O₂
What is the purpose of photosynthesis?
Photosynthesis converts sunlight into chemical energy.
What is the overall equation for cellular respiration?
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP
What is the purpose of cellular respiration?
Cellular respiration converts glucose into ATP (energy).
What are genes?
Genes are the units of heredity made of DNA.
What are alleles?
Alleles are different forms of a gene.
What is genotype?
Genotype refers to the genetic makeup of an organism (e.g., BB, Bb, bb).
What is phenotype?
Phenotype refers to the physical appearance of an organism.
What is a Punnett Square used for?
A Punnett Square is a tool used to predict genetic inheritance.
Name two patterns of inheritance.
Dominant/recessive, codominance, incomplete dominance, or sex-linked traits.
What are mutations?
Mutations are changes in DNA.
What is genetic variation?
Genetic variation refers to the differences in DNA among individuals.
What are some sources of genetic variation?
Mutations, crossing over, independent assortment, and sexual reproduction.
What is meiosis?
Meiosis is a type of cell division that produces gametes and increases genetic diversity.
What is the Central Dogma of molecular biology?
The Central Dogma describes the flow of genetic information: DNA → RNA → Protein.
What is DNA replication?
DNA replication is the process of copying DNA before cell division.
What is ATP?
ATP is the main energy molecule used by cells.
What is CER used for in science?
CER (Claim, Evidence, Reasoning) is used to support answers when explaining scientific concepts or solving problems.
Frequently Asked Questions About 9th Grade Biology Class
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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