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WorksheetsCFA 2
Total questions: 35
Worksheet time: 21mins
The picture shows a student using a microscope to study a prepared slide of a single-celled organism.
A single-celled organism can be classified as a prokaryote based on the absence of-
A cell membrane
Ribosomes
Chromosomes
A nucleus
Which molecule synthesized by plants is a major source of energy for cellular processes
Wax
Nucleic Acids
Glucose
Chlorophyll
The picture shows a contractile vacuole of a unicellular freshwater organism. The contractile vacuole regulates the flow of water into and out of the cell in an aquatic environment.
What conditions cause the contractile vacuole to fill with water?
The concentration of water is greater outside of the cell than inside the cell.
The temperature of water in the vacuole is higher than the temperature of its environment.
The concentration of water inside the cell is the same as the concentration outside the cell.
The temperature of water in the vacuole is lower than the temperature of its environment.
Viruses can be transmitted through air, water, insect bites, and direct skin contact. Once a virus gains entry to the body, it invades a host cell in order to--
Deactivates the host cell's defenses
Synthesizes antibodies for defense
Metabolize host proteins and grow
Access cellular processes for replication
Human Immunodeficiency Virus (HIV) often infects and destroys CD4 T cells. These CD4 T cells are one of many kinds of white blood cells that are an important part of the immune system.
The most common danger related to he destruction of CD 4 T cells-
An increase in the risk of high blood pressure
An increase in the threat of diseases caused by microorganisms and viruses
A decrease in the flow of blood to vital organs
A decrease in the amount of oxygen being transported to tissue
In the early 1900s a scientist hypothesized a link between DNA and production of proteins in the cytoplasm. However, the fact that DNA could not be found outside the nucleus led scientist to believe that another substance was also involved in the synthesis of protein in the cytoplasm. In the 1940s scientist performed an experiment that ultimately identified the site of protein synthesis. They also identified the molecule responsible for transporting information from the nucleus to the site of protein synthesis. What was this newly identified molecule?
A gene
mRNA
ATP
Thymine
This diagram shows cellular activity across a cell membrane.
Which two processes does this diagram most directly model?
Energy conversions and synthesis of new molecules
Synthesis of new molecules and energy conversion
Transport of molecules and energy conversion
Homeostasis and transport of molecules
The picture shows a 3-D model of a virus called a bacteriophage. Bacteriophages can infect bacteria such as E. Coli.
In what way are the bacteriophage and E. Coli alike?
They contain antibodies
They reproduce by mitosis
They have identical genomes
They lack membrane-bound organelles
The 1918 influenza epidemic killed between 50 and 100 million people worldwide. This epidemic happened near the end of World War I. More people die from the influenza epidemic than were killed in the war. Which of the following explains why its virus was so deadly worldwide?
Infected soldiers returning from the war spread the virus when they coughed
Food was scarce because of the war, so people were under nourished, and their immune systems were weakened
Medical personnel often became ill as a result of exposure to airborne virus particles
All of the above
A remora is a fish that has an adhesive disk on the back of its head that it uses to attach itself to a large shark. When food floats away from the shark's mouth as it feeds, the remora collects the scraps. Drawings of a shark with the remora attached and a remora's adhesive disk are shown.
The relationship between the remora and the shark is an example of-
Predation
Parasitism
Commensalism
Competition
Some students used vinegar to dissolve away the shell of these eggs as models of human red blood cells. The students observed the changes in the eggs when they were placed in different solutions.
Which statement best describes the role of the cell membrane in this model?
The cell membrane is an impermeable barrier that prevents water form entering the cell
The cell membrane allows solutes to enter the cell, which causes the cell to shrink
The cell membrane allows water to enter and leave the cell
The cell membrane removes solutes from the enviroment
Some students used information they gathered from lab investigations to prepare a table. They entered the table in their lab notebooks.
Which of these correctly identifies the two cells described in the table?
Cell 1 is eukaryotic, and cell 2 is prokaryotic
Cell 1 is prokaryotic, and cell 2 is eukaryotic
Both cell 1 and cell 2 are eukaryotic
Both cell 1 and cell 2 are prokaryotic
All living organisms are composed of which of the following?
Cells
Tissures
Organs
Muscles
Which statement is NOT a part of the cell theory?
Cells are the basic unit of structure of living things
Cells are the basic unit of function of living things
Cell parts such as chloroplasts are selfreplicating
Cells come from preexisting cells
What is true about all living cells?
They need sunlight for energy
They can make their own food
They grow and divide to make more cells
Which organism has only one cell?
Use the information and the diagrams below to answer the following questions(s).
A student observed different types of cells under a microscope. Four of the cells he observed are shown.
Cell 4 has many hair-like structures that it uses for movement. What are these structures called?
Cilia
Vacuoles
Flagella
Pseudopodia
What is the function of the selectively permeable plasma membrane?
To store chemical heat and energy inside the cell
To control the movement of substances into and out of the cell
To control movement of red blood cells
Tay-Sachs disease is a genetic disorder in which lipids are not properly digested. Which organelle is not properly working in this disorder?
Cytoplasm
Lysosome
Nucleus
Ribosome
Which statement describes a cell process that is common to both eukaryotic and prokaryotic cells?
Both cell types carry out transcription in the nucleus
Both cell types use ribosomes to carry out translation
Both cell types assemble amino acids to carry out transcription
Both cell types carry out translation in the endoplasmic reticulum
Eukaryotic cells are differentiated from prokaryotic cells because eukaryotic cells
Are much smaller
Have permeable membranes
Have a higher rate of reproduction
Have nuclei
Which of the following cells characterized in the chart below is a prokaryotic cell?
Cell A
Cell B
Cell C
Cell D
What is the main function of leaves?
Leaves provide support for growth and a place to store food
Leaves provide a place for photosynthesis to occur
Leaves absorb water and minerals and transport nutrients to the stem
Leaves create a barrier that prevents water in the plant's tissue from evaporating
How are plant and animal cells similar?
They both have a flagella
They both have a nucleus
They both have an eyespot
They both have a chloroplast
Use the diagram below of an animal cell and a plant cell to answer the following question.
Features of plant cells that clearly make them different from animal cells are
A larger nucleus and fewer chromosomes
A rigid cell wall and chloroplast
More cytoplasm and smaller vacuoles
A changing size and indefinite shape
What is the main function of a vacuole?
Storage of water
Synthesis of energy
Replication of DNA
Formation of proteins
Use the information below to answer the following question.
Which of these organelles would most directly be harmed by this toxin?
Ribosomes
The nucleus
Mitochondria
The vacuole
Unicellular organisms carry out all the necessary life processes in one cell. In multicellular organisms, each cell is specialized to perform a specific function. How do the cells in multicellular organisms become specialized?
Cells develop specific functions through the expression of different genes as they mature
A single nucleus coordinates the function performed by each cell
The brain communicates the function required for each cell
Each cell carries a unique set of genes
Which organelle is correctly matched with the cell process it performs?
Vacuole- protein synthesis in leaf cells
Chloroplast- diffusion of water in root systems
Mitochondrion- energy production in muscle tissue
Ribosome- production of messenger RNA molecules in yeast cells
Which cellular organelle is responsible for packaging the protein that the cell secretes?
Cytoskeleton
Cell membrane
Lysosome
Golgi apparatus
Depending on its electric charge, shape, and chemical properties, a substance may or may not be allowed to pass through a cell membrane. This function of the cell membrane is important because it...
Prevents cell division
Prevents destruction of the cell wall
Allows the cell to maintain homeostasis
Allows amino acids to move into and out of the cell
Several different types of cells are shown below.
Which two types of cells are most similar in shape?
Skin cells and bone cells
Nerve cells and skin cells
Bone cells and nerve cells
Muscle cells and skin cells
If the xylem in a young tree is damaged, which process is first affected?
Performing photosynthesis
Transporting sugar to the roots
Transporting water to the leaves
Absorbing water from the soil
Use the information below to answer the following question.
Most organisms are made of many different types of cells. Each tupe of cell has a special role within the organism.
Which of these cells uses sunlight to produce food?
Leaf cell
Skin cell
Nerve cell
Muscle cell
The total magnification of an image formed by a compound light microscope is a result of the combined magnification of the
Eyepiece and diaphragm
Objective and mirrorr
Eyepiece and objective
Low- power objective and high power objective
