Cells a. must contain DNA within a nucleus. b.are composed of many types of tissues. c. can be building blocks for complex organisms. d. are the smallest entity studied by biologists. e. are found in plants and animals, but not bacteria.

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    Answer: The building blocks for complex organisms.

    Explanation:

    Cells must contain DNA within a nucleus is incorrect. This is true that cells contain genetic material (DNA and RNA) in nucleus. But mitochondria and chloroplast organelles also contain genetic material and these organelles present outside the nucleus.

    Cells are composed of many types of tissues is incorrect. Cells are smallest unit of life. This is because cells combined to form tissues. Tissue form organs and organs make organ system and then while organism.

    Cells are the smallest entity studied by biologists is incorrect. This is because atoms are the smallest entity studied by microbiologist. Cells are smallest unit of life. Atoms combined to form molecules and then cells.

    Cells are found in plants and animals, but not bacteria is incorrect. This is because cells are smallest structural and functional unit of life and every living organism is made up of cells. Bacteria are unicellular and human beings are multicellular.

    Cells can be building blocks for complex organisms. They are building blocks of life. Cells combined to form tissues and tissues combined to form organs then organ system and then whole organism.

    • 09 Jul 2020 @ 04:42


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