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Ninth Grade (Grade 9) Biology Questions

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Grade 9 Cell Structure and Function
Which cell organelle assists with cell division during mitosis and meiosis?
  1. centriole
  2. lysosome
  3. centrosome
  4. cytoplasm
Grade 9 Cell Structure and Function
Human cells are eukaryotic cells.
  1. True
  2. False
Grade 9 Cell Structure and Function
What is every living thing composed of?
  1. bones
  2. cells
  3. blood
  4. teeth
Grade 9 Biotic and Abiotic
A rodent population leaves an ecosystem because of decreased temperatures and increased rain. Which of the following best explains why the rodents left?
  1. an increase in predation
  2. a decrease in parasitism
  3. a change in biotic factors
  4. a change in abiotic factors
Grade 9 Cell Structure and Function
The ability of the body to maintain a constant internal environment is known as
  1. metabolism.
  2. homeostasis.
  3. active transport.
  4. positive feedback.
Grade 9 DNA, RNA, and Genetics
Which kind of sugar is encountered in the nucleotides of DNA?
  1. deoxyribose
  2. ribose
  3. glucose
  4. none of the above
Grade 9 Communities, Populations, and Ecosystems
Which is NOT considered to be a density-dependent factor?
  1. competition
  2. predation
  3. commensalism
  4. parasitism and disease
Grade 9 DNA, RNA, and Genetics
Which nitrogenous base is only found in RNA?
  1. uracil
  2. thymine
  3. guanine
  4. cytosine
Grade 9 Evolution
A change in the sequence of DNA during replication can result in                               .
  1. rapid evolution in an organism
  2. synthesis of antigens
  3. variations
  4. none of the above
Grade 9 DNA, RNA, and Genetics
Which molecules are involved in protein synthesis?
  1. ribosomal RNA, transfer RNA, and mutagens
  2. messenger RNA, ribosomal RNA, and transfer RNA
  3. messenger RNA, introns, and ribosomal RNA
  4. transfer RNA, introns, and mutagens
Grade 9 Protists and Fungi
Yeasts reproduce by                 .
  1. producing spores
  2. using hyphae
  3. using fungi
  4. budding
Grade 9 Macromolecules
Phospholipids are the primary component of
  1. cell membranes.
  2. cell walls.
  3. ribosomes.
  4. steroids.
Grade 9 Food Chains and Webs
What is composed of several food chains in an ecosystem that intersect and depend on one another?
  1. niche
  2. feeding level
  3. energy pyramid
  4. food web
Grade 9 Biochemistry
Two of the four principle classes of organic compounds are proteins and nucleic acids. What is the relationship between proteins and nucleic acids?
  1. Nucleic acids contain the information to make proteins.
  2. Proteins are long polymers of nucleic acids.
  3. Nucleic acids use proteins for energy.
  4. Nucleic acids are a subset of proteins.
Grade 9 Biochemistry
If you look through the microscope at a cell and see a nucleus, mitochondria, chloroplasts, and a cell wall, what type of cell are you looking at?
  1. eukaryotic plant cells
  2. eukaryotic animal cells
  3. prokaryotic plant cells
  4. bacteria cells
Grade 9 Skin, Skeleton, and Muscles
Another name for collarbone is
  1. clavicle.
  2. cochlear.
  3. cartilage.
  4. compact bone.
Grade 9 Botany
In the nitrogen cycle, how is nitrogen is fixed?
  1. nitrogen-fixing bacteria
  2. lightning
  3. a only
  4. a and b
  5. none of the above
Grade 9 Evolution
What scientific theory did Charles Darwin have a key role in shaping?
  1. theory of circumnavigation
  2. cell theory
  3. theory of evolution
  4. climate change theory
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