Final Exam of Living Environment 8th graders good luck i hope this exam helps in most of the schools this is the 1st final exam 1. The diagram below represents two single-celled organisms.
These organisms carry out the activities needed to maintain homeostasis by using specialized internal
3. One primary function of the cell membrane is
A. regulating the flow of simple sugars into or out of the cell
B. synthesizing substances by breaking down cell organelles
C. storing carbohydrates, water, and starches for future use
D. digesting carbohydrates, fats, and protein
4. While viewing a slide of rapidly moving sperm cells, a student concludes that these cells require a large amount of energy to maintain their activity. The organelles that most directly provide this energy are known as

A. tissues C. systems
B. organelles D. organs
2. Which statement best compares a multicellular organism to a single-celled organism?
A. A multicellular organism has organ systems that interact to carry out life functions, while a single-celled organism carries out life functions without using organ systems.
B. A single-celled organism carries out fewer life functions than each cell of a multicellular organism.
C. A multicellular organism always obtains energy through a process that is di!erent from that used by a single-celled organism.
D. The cell of a single-celled organism is always much larger than an individual cell of a multicellular organism.
A. vacuoles
C. chloroplasts
B. ribosomes D. mitochondria
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5. Studies of fat cells and thyroid cells show that fat cells have fewer mitochondria than thyroid cells. A biologist would most likely infer that fat tissue
A. does not require energy
B. has energy requirements equal to those of thyroid tissue
C. requires less energy than thyroid tissue
D. requires more energy than thyroid tissue

6. Damage to which structure will most directly 9. disrupt water balance within a single-celled
organism?
The swordfish contains a heat generating organ that warms its brain and eyes up to 14! C above the surrounding ocean water temperature. Which structures are most likely to be found at relatively high concentrations within the cells of this heat generating organ?
A. ribosome C. nucleus
B. cell membrane D. chloroplast
A. nuclei
C. chromosomes
B. chloroplasts D. mitochondria
7. If the ribosomes of a cell were destroyed, what e!ect would this most likely have on the cell?
A. It would stimulate mitotic cell division.
B. The cell would be unable to synthesize proteins.
C. Development of abnormal hereditary features
would occur in the cell. 10.
D. Increased protein absorption would occur through the cell membrane.
8. What is the main function of a vacuole in a cell?
A. storage
B. coordination
C. synthesis of molecules
D. release of energy
Cell membranes are said to be selectively permeable. Which statement best explains what selectively permeable means?
A. The cell membrane prevents any harmful substance from entering the cell.
B. The cell membrane lets certain substances enter the cell and keeps certain substances out of the cell.
C. The cell membrane allows only large molecules to di!use into the cell.
D. The cell membrane has pores that let only water and glucose into the cell and carbon dioxide out.
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2021 Unit 1 Assessment

11. Some human body cells are shown in the diagrams 13. below.
These groups of cells represent di!erent
A. tissues in which similar cells function together
B. organs that help to carry out a specific life activity
C. systems that are responsible for a specific life activity
D. organelles that carry out di!erent functions
A student is viewing a plant stem cross section using a compound light microscope.
What parts of the microscope should the student use to bring the image into focus?
A. AandF B. BandE C. CandD D. DandF
14. Muscle cells in athletes often have more mitochondria than muscle cells in nonathletes. Based on this observation, it can be inferred that the muscle cells in athletes
A. have a smaller demand for cell proteins than the muscle cells of nonathletes
B. reproduce less frequently than the muscle cells of nonathletes
C. have nuclei containing more DNA than nuclei in the muscle cells of nonathletes
D. have a greater demand for energy than the muscle cells of nonathletes