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Biology - Exam

QuestionAnswer
Josh wants to determine how much the mass of a fungus growing on a nutrient agar plate changes over an 8 hour period. What is the most appropriate unit of measure for him to use? Milligram
The presence of what structure indicates that the cell is an eukaryote? Nucleus
Ashley’s favorite breakfast food, papaya, contains significant amounts of the enzyme papain( a protease). What substances does papain help digest? Proteins
Give an example of a formula that represents an organic molecule: C10H20O10 (C – carbon is in every organic molecule)
Johnny visits Redwood National Park and learns that redwood trees grow to heights of more than 100 m. How do trees get water and nutrients from the soil to their tops? Transpiration from the leaves pulls the water upward
All living things maintain a balance within their cells and within the environment through the process of: Homeostasis
The most abundant compound in most living things is: Water
What is NOT a function of proteins? Store and transmit heredity
The cell part that would best distinguish a plant cell from an animal cell would be: Cell wall
The cell membrane contains channels and pumps that help move materials form one side to the other. What are these channels and pumps made of? Bilipids
What experimental design would provide scientists with the best data for investigating which type of feed yields the greatest gain in lean muscle mass in sheep? Test 5 similar groups of sheep with 5 different feed mixtures and measure weight gain at the end of the trial period.
What is NOT a characteristic of all living things Ability to move
In the metric system, the basic unit of length is: Meter
A map of eastern North America, showing a pH of rainfall in the various areas, indicates that the pH of rain in the state of Vermont varies from 4.33 to 4.50. According to these figures, the most acidic rainfall in Vermont has a pH of: 4.33
Scientists publish the details of important experiments so that: their experimental procedures can be reviewed, their work can be repeated, and others can try to reproduce the results.
What term describes a substance formed by the combination of two or more elements in definite proportions? Compound
The diffusion of water across a selectively permeable membrane is called: Osmosis
Water molecules are polar. This means that: The oxygen side is slightly negative and the hydrogen side is slightly positive
When the concentration of molecules on both sides of a membrane is the same, the molecules will: Move across the membrane in both directions
Why are organic molecules so diverse? Because they have carbon skeletons that vary greatly in arrangement
Diffusion occurs because: Molecules constantly move and collide with each other
Diffusion is the movement of molecules from: An area of high concentration to an area of low concentration
The variable that is measured in an experiment is the________variable Dependent/responding
The three particles that make up an atom are: Protons, neutrons, electrons
What molecule stores energy in a useable form for the cell? ATP
What is an organelle found in the cytoplasm? Ribosome
A scientist places a cell in a solution, and over time the cell gains mass and swells. What is the most likely explanation for the cell’s gain in mass? The solution is hypotonic to the cell.
What is the term used to describe the energy needed to get a reaction started? Activation Energy
The molecule on which an enzyme acts is called a(n): Substrate
What does a controlled experiment allows the scientist to isolate and test A single variable
Enzymes affect the reactions in living cells by changing the Speed of the reaction
An atom that has gained or lost electrons is called: An ion
What means of particle transport requires input of energy from the cell? Active transport
Dr. Howard performs an experiment testing the effectiveness of different cough syrups. What is the independent variable in the experiment? Type of cough syrup
Hypotheses may arise from: Logical inferences, prior knowledge, and imaginative guesses
A student wants to determine whether temperature affects the rate at which mold grows on bread. The student puts one piece of bread inside the refrigerator. What treatment best comparison for this experiment? Placing another piece of bread in a closed Petri dish on the countertop
Created by: tonilynne1