WorksheetsScience quiz redo
Total questions: 10
Worksheet time: 1hrs 4mins
4B) A type of cellular transport is shown
Which description best identifies this type of cellular transport?
Active Transport, because energy is being used to move molecules against the concentration gradient.
Facilitated Diffusion, because energy is being used to move molecules with the concentration gradient.
Osmosis, because energy is not being used to move molecules with the concentration gradient.
Endocytosis, because energy is not being used to move molecules against the concertration gradient.
(9A) A table of four carbohydrates is shown
Which list correctly matches the functions to the types of carbohydrates?
Energy: Gylcogen and Starch
Structure: Cellulose and Chiti
Energy: Cellulose and Chitin
Structure: Glycogen and Starch
Energy: Gylcogen and Chitin
Structure: Cellulose and Starch
Energy: Cellulose and Starch
Structure: Glycogen and Chitin
(9A) Transmembrane proteins span the width of cell membranes. Four types of transmembrane proteins are shown in a section of cell membrane.
Although these proteins have different specific functions, they all -
Stop chemical reactions within the cell
Synthesize molecules that signal other cells
Help the cell interact with its external environmental
Remove large waste particles from the cytoplasm of the cell
(9C) Taq polymerase is an enzyme used in the polymerase chain reaction (PCR) to replicate fragments of DNA. A study published in 1976 examined the properties of Taq polymerase after the enzyme was isolated from Thermus aquaticus, a thermophilic bacterium that lives in the hot springs of Yellowstone National Park. The graph shows one of the results of the study.
Which statement about enzyme activity is best supported by this graph?
An enzyme must be composed of multiple polypeptides, or subunits, to be active.
An enzyme"s rate of activity increases with time until it becomes inactive.
An enzyme functions best under specific temperature conditions.
An enzyme works equally well in bacteria that are adapted to high temperatures and in eukaryotic cells such as human cells
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(9C) Fireflies emit light. The production of light by an organism is called bioluminescence. To generate visible light, cells in a firefly's tail produce thousands of luciferase enzymes. Luciferase binds to a chemical called luciferin. Once bound, the luciferase enzyme speeds up a chemical reaction that combines an oxygen molecule and luciferin to produce oxyluceferin. This reaction requires energy and releases light. Which of the following best describes how the luciferase enzyme speeds up the chemical reaction?
Luciferase increases the amount of time the light is visible.
Luciferase decreases the amount of energy required for the reaction to start.
Luciferase increases the number of sites on luciferin that must bind to oxygen.
Luciferase decreases the temperature of the environment inside the body of the firefly.
(4C) According to the endosymbiotic theory, the mitochondria and chloroplast were engulfed by an ancestral prokaryotic cell. What type of transport would explain how this occurred?
Facilitated Diffusion
Exocytosis
Endocytosis
none of the above
4B) Some students used vinegar to dissolve away the shells of three eggs and used 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 from 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 environment.
(4B) 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 vacuole to fill with water?
The concentration of water is greater outside 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.
(4B)
Which of the following depicts facilitated diffusion?
A
B
C
A and B
(4B) 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 homeostasis
Transport of molecules and energy conversions
Homeostasis and transport of molecules
