7th grade Science Unit 7 Review
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  • Question 1
    60 seconds
    Q.

    In the 1800s two scientists, Theodor Schwann and Matthias Schleiden, studied different types of organisms. After many years of studying a great variety of organisms, they drew similar but independent conclusions about their observations. Which statement is developed most directly from the conclusions and is part of the modern cell theory?

    answer choices

    Cells contain hereditary information.

    Living things are composed of cells.

    Cells exist only in multicellular organisms.

    The functions of living things occur in cells.

  • Question 2
    60 seconds
    Q.

    What kind of cell is represented by the above model?

    answer choices

    Fungi

    Animal

    Bacteria

    Plant

  • Question 3
    60 seconds
    Q.

    There are many processes at work in the human stomach. The stomach is part of which larger system?

    answer choices

    circulatory

    digestive

    nervous

    respiratory

  • Question 4
    60 seconds
    Q.

    In 1838 botanist Matthias Schleiden determined that all plants are composed of cells. In 1839 anatomist Theodor Schwann proposed that all animals are composed of cells. In 1855 biologist Rudolph Virchow added to Schleiden’s and Schwann’s observations and proposed that all living things are composed of cells. Which statement is also part of Virchow’s cell theory?

    answer choices

    All cells have a cell wall.

    All cells are capable of photosynthesis.

    All cells arise from pre-existing cells.

    All cells can develop into any other type of cell.

  • Question 5
    60 seconds
    Q.

    Living organisms are made up of cells. Cells are organized at different levels to form very complex living organisms like your body. Each level has a specific role or job to perform.

    Which of the following lists these levels in the correct order of organization from the simplest to the most complex?

    answer choices

    Organisms, organ systems, organs, tissues, cells

    Tissues, cells, organs, organisms, organ systems

    Organs, organ systems, organisms, cells, tissues

    Cells, tissues, organs, organ systems, organisms

  • Question 6
    60 seconds
    Q.

    Which structures perform similar functions in plant and animal cells?

    answer choices

    mitochondria, nucleus, cell membrane

    vacuole, chloroplast, cell wall

    cell membrane, cell wall, nucleus

    ribosome, cell membrane, chloroplast

  • Question 7
    60 seconds
    Q.

    Which structure of plant cells helps to maintain homeostasis?

    answer choices

    semipermeable cell membrane

    chlorplasts

    large vacuoles filled with food, air, and water

    tough, rigid cell wall

  • Question 8
    60 seconds
    Q.

    An animal’s liver is very important. It cleans the blood while also playing a key role in digestion. Which level of biological organization does the liver belong to?

    answer choices

    Cell

    Tissue

    Organ

    Organ System

  • Question 9
    60 seconds
    Q.

    A strainer allows certain items through, but not others. Which cell part functions similarly to a strainer?

    answer choices

    nucleus

    ribosome

    mitochondrion

    cell membrane

  • Question 10
    60 seconds
    Q.

    Which of these can be found in a plant cell but not in an animal cell?

    answer choices

    nucleus

    chloroplast

    chromosome

    cell membrane

  • Question 11
    60 seconds
    Q.

    Students observed cells under the microscope. They observed that the cells had a cell wall, cell membrane, nucleus, and many chloroplasts. Which observation helps students identify the type of cell observed?

    answer choices

    The presence of a nucleus means the cells are from a plant.

    The presence of chloroplasts means that the cells are from a plant.

    The presence of a cell membrane means that the cells are from an animal.

    The presence of a cell wall means that the cells are from an animal.

  • Question 12
    60 seconds
    Q.

    Which cell structure functions like a school principal’s office?

    answer choices

    Vacuole

    Nucleus

    Cell wall

    Cell membrane

  • Question 13
    60 seconds
    Q.

    The fluid surrounding the organelles of a cell is the —

    answer choices

    cytoplasm

    chloroplast

    mitochondria

    cell membrane

  • Question 14
    60 seconds
    Q.

    In addition to other materials, both the respiratory system and the circulatory system move oxygen. Which of the following BEST explains why there are two human body systems to move oxygen?

    answer choices

    One moves oxygen into the body, and the other moves oxygen out of the body.

    One moves oxygen while awake, and the other moves oxygen when asleep.

    One moves oxygen into the body, and the other moves oxygen through the body.

    One moves oxygen to the upper body, and the other moves oxygen to the lower body.

  • Question 15
    60 seconds
    Q.

    Blood is an odd structure in animals because it is one of the few structures that has functions and is fluid. Blood is mostly made of two types of cells. Red blood cells carry oxygen to all parts of the body. White blood cells protect the body from disease using a variety of methods. Blood is best classified as a —

    answer choices

    cell

    tissue

    organ

    organ system

  • Question 16
    60 seconds
    Q.

    The primary function of a chloroplast is to —

    answer choices

    store water and nutrients

    convert food into energy a cell can use

    control the functions of a cell and control genetic traits

    convert radiant energy into chemical energy through photosynthesis

  • Question 17
    60 seconds
    Q.

    Which statement accurately represents the differences in plant and animal cells?

    answer choices

    Only animal cells have a cell membrane, mitochondria, and cytoplasm.

    Only plant cells have a cell wall, chloroplasts, and a vacuole.

    Only animal cells have a cell wall, chloroplasts, and a vacuole.

    Only plant cells have a cell membrane, mitochondria, and cytoplasm.

  • Question 18
    60 seconds
    Q.

    Which of the following do all living organisms have in common?

    answer choices

    Cells are held up by cell walls

    Cells are made from pre-existing cells

    Special cells that can do many different things

    The method to get water and food into their cells

  • Question 19
    60 seconds
    Q.

    The food that you eat travels from your mouth, down your esophagus, into your stomach, and through your small and large intestines before your body rids itself of solid waste. As the food passes through your body, it is digested, and you get important nutrients from the food.

    Which of the following is the correct term used to describe a group of body parts working together to perform a specific function?

    answer choices

    A tissue

    An organ

    An organ system

    An organism

  • Question 20
    60 seconds
    Q.

    A student observing a sample of cheek cells noticed that all of the cells were identical. Which statement below explains why these cells are identical?

    answer choices

    They have a chloroplast.

    They do not have a cell wall.

    All cells come from other cells through division.

    They all come from the same location in the body.

  • Question 21
    60 seconds
    Q.

    The skin of an animal functions to protect it from external factors, much like the walls of a house protect people inside it from weather. What structure of an animal cell is most like the skin of an animal and the wall of a house?

    answer choices

    nucleus

    cell wall

    cell membrane

    mitochondrion

  • Question 22
    60 seconds
    Q.

    According to cell theory, what do each of the following organisms have in common?

    answer choices

    Each organism is able to photosynthesize.

    They are all made up of the same kinds of atoms.

    They can all reproduce by spontaneous generation.

    Cells are the basic unit of structure for each organism.

  • Question 23
    60 seconds
    Q.

    Early Romans discovered that objects could be magnified through the construction and shaping of glass. For the past thousand years, this discovery has led to the construction and design of modern day microscopes. The development of the microscope was used in the 17th and 18th centuries to observe cells and eventually develop “cell theory”. Which of the following is the most basic explanation of “cell theory”?

    answer choices

    All cells are identical.

    All living things are made of cells.

    Every object in the universe is made of cells.

    Cells are made from atoms during chemical reactions.

  • Question 24
    60 seconds
    Q.

    The diagram illustrates cells found in the stomach. Which statement about the cells is correct?

    answer choices

    Cell A has different genetic information than Cell B.

    Cell A contains exactly the same genetic information as Cell B.

    Cells in the stomach lining reproduce slowly due to the damaging effects of stomach acid.

    The stomach acid destroyed the genetic information in the parent cell, but left the offspring cells undamaged.

  • Question 25
    60 seconds
    Q.

    What level of organization within a plant is the structure above?

    answer choices

    Tissue

    Organ

    cell

    Organ system

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