Unified Science Practice (cell Transport, Bonding, Periodic Trends) Question Preview (ID: 35329)
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A freshwater plant is placed in a container of saltwater. What will most likely happen to the cells of the plant?
a) They will swell because water will move into them.
b) They will shrink because salt will move out of them.
c) They will swell because salt will move into them.
d) They will shrink because water will move out of them.
Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane?
a) ATP is being rapidly consumed near the cellular membrane.
b) Substances are moving through channels in the cell membrane.
c) Substances are moving from high to low concentrations.
d) Substances are moving rapidly across the cell membrane.
What is (are) the main difference(s) between passive transport and active transport?
a) Passive transport does not require any cellular proteins; active transport requires cellular proteins.
b) Active transport requires cellular energy for substances to cross the cell membrane; passive transport does not.
c) Passive transport occurs primarily in single-cell organisms; active transport occurs primarily in multi-cellular organisms.
d) Active transport works against gravity (for example, upwards from the roots of a tree); passive transport works with gravity
All of the following are types of passive transport except
a) endocytosis
b) facilitated diffusion
c) osmosis
d) diffusion
What is the role of ATP in the process of active transport?
a) It provides the energy to transport the cell in its environment.
b) It lengthens the fatty acid chains in the membrane.
c) It provides the energy that cells need to move molecules against a concentration gradient.
d) It weakens the membrane, allowing molecules to pass through more easily.
Which of the following is an example of osmosis?
a) A single-celled organism uses osmosis to take in food particles.
b) Intestinal cells use osmosis to absorb nutrients from food
c) A plant's roots use osmosis to absorb water from the soil.
d) The human body uses osmosis to move antibodies out of cells.
Which statement is true regarding active transport?
a) Substances can move from areas of low concentration to areas of high concentration
b) Substances do not require additional energy to move in and out of cells.
c) Substances can only move into cells, not out of cells.
d) Substances can only move across the cell membrane if they are water soluble.
In general, in what direction does a diffusing substance move?
a) up its concentration gradient
b) down its concentration gradient
c) in the opposite direction than it would normally move
d) it depends on the substance being diffused
Why might heating an enzyme slow the rate at which the rate occurs
a) it changes its shape
b) the enzyme is specific
c) it kills the enzyme
d) it changes the substrate
Enzymes influence chemical reactions in living systems by
a) combining with atmospheric gases
b) absorbing water during synthesis and digestion
c) becoming apart of the product after the reactions occur
d) affecting the rate at which reactions occur
The valence shell of a neutral atom loses two electrons. Which of the following ions might result?
a) O2-
b) K+
c) N2-
d) Mg2+
Which of the following elements is a nonmetal?
a) Li
b) Mn
c) Se
d) Ba
Which best explains why water dissolves most salts?
a) Water is nonpolar and salts form ions in solution
b) Water is polar and salts form ions in solution
c) Water has a different density than most salts
d) Water is the same density as salts
Which element is an alkaline earth metal?
a) Li
b) O
c) Ne
d) Ca
Which type of bond is responsible for atoms of pure gold to be bonded togther?
a) polar
b) covalent
c) metallic
d) ionic
Carbon atoms can link themselves together into long chains and rings to form a vast number of highly complicated molecules. Which of the following statements BEST explains why carbon atoms behave this way?
a) They easily form covalent bonds with each other.
b) They easily combine with atoms of oxygen.
c) They easily become highly charged ions.
d) They easily form ionic bonds with each other.
Aluminum oxide, Al2O3, is produced by combining Al3+ and O2- particles. What type of compound has been formed?
a) ionic
b) polar
c) metallic
d) covalent
Which group in the periodic table forms ions that have a valence of 1+?
a) 2
b) 8
c) 16
d) 1
Which of the following atoms has the largest atomic radius?
a) barium (Ba)
b) magnesium (Mg)
c) chlorine (Cl)
d) iodine (I)
Which of the following atoms has six valence electrons?
a) sulfur (S)
b) magnesium (Mg)
c) sodium (Na)
d) silicon (Si)
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