3523106
Pregunta 1
Pregunta
In the diagram below, which letter points to a structure that helps with cell attachment, signaling, and recognition of substances?
Respuesta
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Structure E
-
Structure D
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Structure I
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Structure A
-
Nome of these
Pregunta 2
Pregunta
Which letter is pointing to a protein?
Respuesta
-
Structure C
-
Structure F
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Structure E
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Structure D
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Structure H
Pregunta 3
Pregunta
Which letter points to a part that is polar and hydrophilic?
Respuesta
-
Structure E
-
Structure J
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Structure D
-
Structure H
Pregunta 4
Pregunta
What is the composition of the nucleus of an atom?
Respuesta
-
Ions and Electrons
-
Electrons and Protons
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Protons and Nuetrons
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Neutrons and Electrons
Pregunta 5
Pregunta
The diagram illustrates the use of energy by a nerve cell to expel a sodium ion from the inside of the cell. Which of these would best explain why ATP energy is needed to complete this function?
Respuesta
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The ion is being transported against the concentration gradient.
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The ion has more kinetic energy than the surrounding molecules.
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The ion is a waste product that is digested by the cell membrane.
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The ion is too large to pass through the cell membrane by diffusion.
Pregunta 6
Pregunta
Which of these statements correctly describes an example of how monomers combine and create macromolecules?
Respuesta
-
Amino Acids combine and make proteins.
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Nucleic acids combine and make starch.
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Glucose molecules combine and make nucleic acids.
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Proteins combine and make amino acids.
Pregunta 7
Pregunta
Cell membranes allow some molecules to move freely across membranes while others are restricted. Which term best describes this capability of a cell membrane?
Respuesta
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Impervious
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Permeable
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Semi-permiable
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Diffusion
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Synthesis
Pregunta 8
Pregunta
In the diagram shown here, which of these would best explain why the cells shrunk?
Respuesta
-
They are in a hypotonic solution.
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They are in a hypertonic solution.
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They are infected with a bacterium.
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They are infected with virus.
Pregunta 9
Pregunta
What property of water allows it to dissolve many different substances?
Respuesta
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It is a polar molecule.
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It contains hydrogen molecules.
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It has a high specific heat.
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It has low density.
Pregunta 10
Pregunta
Active transport is a term for the movement of molecules from...
Respuesta
-
an area of low concentration to high concentration.
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areas of equal concentration back and forth.
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an area of high concentration to low concentration.
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a negative charge to a positive charge.
Pregunta 11
Pregunta
Water will move out of a cell when the cell is placed into a solution that is...
Respuesta
-
hypotonic
-
isotonic
-
hypertonic
-
pure water
Pregunta 12
Pregunta
Molecules, such as water, oxygen, and carbon dioxide, move across the cell membrane by...
Respuesta
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facilitated diffusion.
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simple diffusion.
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endocytosis and exocytosis
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protein pumps
Pregunta 13
Pregunta
When energy is not required to move molecules across a cell membrane, the process is called...
Respuesta
-
active transport.
-
passive transport.
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concentration gradient.
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isolation of solutes.
Pregunta 14
Pregunta
The major difference(s) between active and passive transport is...
Respuesta
-
active transport involves the use of proteins while passive is not.
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active transport is faster than passive transport.
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active transport requires energy while passive does not.
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active transport most often moves against the concentration gradient.
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both of these: active transport requires energy while passive does not AND active transport most often moves against the concentration gradient.
Pregunta 15
Pregunta
Which part of the cell membrane is hydrophobic?
Respuesta
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proteins
-
cholesterol
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phosphate heads
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lipid tails
Pregunta 16
Pregunta
Why do cells not dissolve in water?
Respuesta
-
Because the proteins in the cell membrane have covalent bonds between amino acids.
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Because the phosphate heads of the cell membrane are polar and attract to water.
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Because the fatty acid tails of the cell membrane phospholipids are nonpolar.
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Because the cytoplasm has a slightly negative charge and prevents water from entering the cell.
Pregunta 17
Pregunta
The structure of the cell membrane is composed of a bilayer consisting of...
Respuesta
-
phosphates and lipids.
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carboxyl and amino acids.
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phosphates and proteins.
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proteins and lipids.
Pregunta 18
Pregunta
All cells, prokaryotic and eukaryotic, have a few common features. Which of the following is found in both cells?
Respuesta
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Ribosomes
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Nuclear Membrane
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Nucleus
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RER
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Both ribosomes and nucleus
Pregunta 19
Pregunta
Which part of an atom has the least mass?
Respuesta
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Nucleus
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Nuetron
-
Electron
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Proton
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They all have relatively the same mass.
Pregunta 20
Pregunta
If an atom has 8 protons and 9 electrons, then the atom is...
Respuesta
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a cation.
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an anion.
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neutral.
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polar.
Pregunta 21
Pregunta
Which part of the cell is responsible for cell growth and is responsible for metabolism?
Respuesta
-
chloroplasts
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cytoplasm
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ribosomes
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nucleolus
-
mitochondria
Pregunta 22
Pregunta
Each beaker shown here contains a cell in a solution. (The white oval shape = cell.) Which of these beakers and cell would be considered isotonic?
Respuesta
-
Beaker 1
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Beaker 2
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Beaker 3
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Beaker 4
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Beakers 2 and 4
Pregunta 23
Pregunta
In beaker number 3, what would happen to the water?
Respuesta
-
It would move into the cell by osmosis.
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It would move out of the cell by osmosis.
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It would move into the cell by diffusion.
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It would move out of the cell by diffusion.
Pregunta 24
Pregunta
What type of molecule help hold the lipid tails together in the cell membrane?
Respuesta
-
A Carbohydrate
-
A Protein
-
A Cholesterol
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A Carboxyl group
Pregunta 25
Pregunta
What type of bond is most often found between carbon and other elements in organic compounds?
Respuesta
-
ionic
-
covalent
-
hydrogen
-
polar
Pregunta 26
Pregunta
The high specific heat of water provides what function in living things?
Respuesta
-
It helps cool the body.
-
It helps the environment stay warmer.
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It allows molecules to dissolve.
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It helps it flow through plants.
Pregunta 27
Pregunta
The chemical structure of starch is shown here. Based on this diagram, starch is a...
Respuesta
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monomer.
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polymer.
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nucleotide.
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polypeptide.
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disaccharide.
Pregunta 28
Pregunta
The chemical formula for glucose and fructose are C6H12O6. The structural for each of these molecules are shown. Based on the information given, glucose and fructose would be considered...
Respuesta
-
monomers of each other.
-
polymers of one another.
-
isotopes.
-
isomers.
Pregunta 29
Pregunta
Which of the following is not part of the cell membrane?
Respuesta
-
Carbohydrates
-
Lipids
-
Proteins
-
Nucleic Acids
-
All of these are a part of the cell membrane.
Pregunta 30
Pregunta
If the concentration of the solute of sugar is 1% outside of the cell and 3% inside of the cell, which of the following would occur by diffusion?
Respuesta
-
The sugar will move into the cell with the help of ATP by diffusion.
-
The sugar will move out the cell without the help of ATP by diffusion.
-
The sugar will move into the cell without the help of ATP by diffusion.
-
The sugar will move out the cell with the help of ATP by diffusion.
Pregunta 31
Pregunta
Which structure collects and sends molecules to leave the cell by osmosis?
Respuesta
-
Mitochondria
-
Ribosomes
-
Cell membrane
-
Golgi Bodies
Pregunta 32
Pregunta
Marta investigates how water temperature affects the breathing rate of five goldfish. She records the water temperature and counts the number of gill movements of each fish for one minute. Marta slowly raises the water temperature 2 degrees Celsius and then repeats her observations. What is the independent variable in this investigation?
Respuesta
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Number of goldfish
-
Water Temperature
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Number of gill movements
-
Observation time
Pregunta 33
Pregunta
What process moves a small, neutral atom through the cell membrane?
Respuesta
-
Direct transfer through phospholipids.
-
Exocytosis
-
Active Transport
-
Facilitated Diffusion
-
Osmosis
Pregunta 34
Pregunta
Which of these moves a large amount of a liquid substance into a cell?
Respuesta
-
Exocytosis
-
Osmosis
-
Phagocytosis
-
Pinocytosis
Pregunta 35
Pregunta
A cell placed in a solution. After 24 hours, its volume has increased in size 3%. In what type of solution was it placed?
Respuesta
-
hypotonic
-
hypertonic
-
isotonic
-
could be hypotonic or hypertonic
Pregunta 36
Pregunta
Cations moving through a protein in the cell membrane are entering the cell through what process?
Respuesta
-
active transport
-
facilitated diffusion
-
osmosis
-
exocytosis
Pregunta 37
Pregunta
A cell has 5% glucose and the solution surrounding it is 10% glucose, making the cell [blank_start]hypotonic[blank_end] compared to the solution.
Respuesta
-
hypotonic
Pregunta 38
Pregunta
If a cell filled with 5% glucose is in a solution with 10% glucose, the glucose will move [blank_start]into[blank_end] the cell by [blank_start]diffusion[blank_end], and the water will move [blank_start]out of[blank_end] the cell by [blank_start]diffusion[blank_end].
Respuesta
-
into
-
out of
-
diffusion
-
osmosis
-
into
-
out of
-
diffusion
-
osmosis
Pregunta 39
Pregunta
In the diagram of a cell membrane, which structure would be an ion channel?
Respuesta
-
Structure A
-
Structure B
-
Structure C and F
-
Structure E
-
Structure G
Pregunta 40
Respuesta
-
Structure B
-
Structure G
-
Structure E
-
Structure F
-
None of these
Pregunta 41
Pregunta
The use of vesicles to transport substances across the cell membrane out of the cell is called...
Respuesta
-
facilitated diffusion.
-
a protein pump.
-
endocytosis.
-
exocytosis.
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