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TEAS 7 Science TEAS 7 Science Practice Test 2 Which of the following is supported by t...

Which of the following is supported by the cell theory?

A. Cells are alive and recognized as the building blocks for life.

B. Scientists can identify and differentiate cells by using a microscope

C. Cells are produced from existing cells using meiosis instead of mitosis.

D. Living things are composed of a single cell that remains undifferentiated

Answer Explanation:

After scientists were able to view cells under the microscope they formulated the cell theory. One part of this theory concluded that all cells are alive. They also represent the basic unit of life.

All living things are made of cells. Cells are the smallest structural units and basic building blocks of living things. Cells contain everything necessary to keep living things alive. Varying in size and shape, cells carry out specialized functions. This theory, or in-depth explanation, about cells consists of three parts:

  • All living things are composed of one or more cells.
  • Cells are alive and represent the basic unit of life.
  • All cells are produced from pre-existing cells.

 

Therefore, the Correct Answer is A.

More Questions on TEAS 7 Science

  • Q #1: Which statement best represents Mendel’s experiments with garden peas?

    A. As a result, Mendel developed several theories that have since been disproved.

    B. Mendel realized he was on an incorrect track, which led him to other experimental media

    C. As a result, Mendel developed foundational conclusions that are still valued and followed today.

    D. Mendel collaborated with others interested in genetics to develop heredity guidelines we still use today

    Answer Explanation

    Mendel developed theories of genetics that scientists around the world use today.

    From experiments with garden peas, Mendel developed a simple set of rules that accurately predicted patterns of heredity. He discovered that plants either self-pollinate or cross-pollinate, when the pollen from one plant fertilizes the pistil of another plant. He also discovered that traits are either dominant or recessive. Dominant traits are expressed, and recessive traits are hidden.

    Mendel’s Theory of Heredity

    To explain his results, Mendel proposed a theory that has become the foundation of the science of genetics. The theory has five elements:

    • Parents do not transmit traits directly to their offspring. Rather, they pass on units of information called genes.
    • For each trait, an individual has two factors: one from each parent. If the two factors have the same information, the individual is homozygous for that trait. If the two factors are different, the individual is heterozygous for that trait. Each copy of a factor, or gene, is called an allele.
    • The alleles determine the physical appearance, or phenotype. The set of alleles an individual has is its genotype.
    • An individual receives one allele from each parent.
    • The presence of an allele does not guarantee that the trait will be expressed.

  • Q #2: An intracellular chemical signal can be produced in the cell membrane. Once it is produced, where does it go?

    A. To a different cell

    B. To another part of the same cell

    C. To a region right outside the cell

    D. To an area with a high ion concentration

    Answer Explanation

    There are two major types of receptor molecules that respond to an intercellular chemical signal:

    • Intracellular receptors: These receptors are located in either the cytoplasm or the nucleus of the cell. Signals diffuse across the cell membrane and bind to the receptor sites on intracellular receptors, of the same cell.
    • Membrane-bound receptors: These receptors extend across the cell membrane, with their receptor sites on the outer surface of the cell membrane. They respond to intercellular chemical signals that are large, water-soluble molecules that do not diffuse across the cell membrane.

  • Q #3: What raw inorganic material would an autotroph most likely use to create chemical energy for growth?

    A. carbon dioxide

    B. minerals in soil

    C. decaying matter

    D. sugar molecules

    Answer Explanation

    Autotrophs are organisms that use basic raw materials in nature, like the sun, to make energy-rich biomolecules. Minerals are naturally inorganic.

    Autotrophs are organisms that make energy-rich biomolecules from raw material in nature. They do this by using basic energy sources such the sun. This explains why most autotrophs rely on photosynthesis to transform sunlight into usable food that can produce energy necessary for life. Plants and certain species of bacteria are autotrophs.

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