BSC1005 Exam 1 (Chapters 1-7) - Study Guide || A+ Verified
Solutions.
Water molecules are polar because
a.Hydrogen and oxygen atoms form ions when they bond
b.They are key to ice formation
c.Hydrogen and oxygen have very similar electronegativity
d.Hydrogen and oxygen have very different electronegativity correct answers Water molecules are polar because hydrogen and oxygen have very different electronegativities.
Individual water molecules are held together by weak interactions called
a. double bonds
b. ionic bonds
c. covalent bonds
d. hydrogen bonds correct answers Individual water molecules are held together by weak interactions called hydrogen bonds.
Which of the following properties of water is incorrect?
a. it is capable of dissolving lipids
b. it acts as a "universal" solvent
c. it exhibits cohesive behavior
d. it forms a concave meniscus within glass tubes correct answers Water is not capable of dissolving lipids.
Which type of cell does not have a nucleus?
a. Eukaryotic
b. Plant
c. Prokaryotic
d. Animal correct answers Prokaryotic cells do not have a nucleus.
Living organisms and systems avoid major changes in pH through the action of
a. lipids
b. indicators
c. water
d. buffers correct answers Living organisms and systems avoid major changes in pH through the action of buffers.
Which of the following best explains the selective permeability of plasma membranes?
a. lipids cannot enter the cell
b. water cannot enter the cell
c. the plasma membrane allows only certain substances to enter or leave the cell, while others are
excluded d. anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy. correct answers The selective permeability of plasma membranes is described as anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy.
Which of the following refers to the transport of substances down their concentration gradient across a biological membrane WITH the participation of a transport proteins but without the energy input of ATP
a. active transport
b. facilitated diffusion
c. simple diffusion
d. exocytosis correct answers The transport of substances down their concentration gradient across a biological membrane WITH the participation of a transport proteins but without the energy input of ATP is called facilitated diffusion.
Which of the following refers to the transport of substances against their concentration gradient across a biological membrane, into a cell, with the participation of a transport proteins with the energy input of ATP
a. active transport
b. facilitated diffusion
c. simple diffusion
d. exocytosis correct answers The transport of substances against their concentration gradient across a biological membrane, into a cell, with the participation of a transport proteins with the energy input of ATP is called active transport.
The sum total of all the chemical reactions that occur in organisms is called _________.
a. hydrolysis
b. cellular synthesis
c. conservation of energy
d. metabolism correct answers The sum total of all the chemical reactions that occur in organisms is called metabolism.
Enzymes are biological catalysts that increase how fast a reaction occurs. They do this by...
a. Decreasing activation energy needed to get the reaction started
b. Increasing the temperature of the substrates
c. Contributing electrons to the reaction
d. Changing the pH of the environment correct answers Enzymes are biological catalysts that increase how fast a reaction occurs. They do this by decreasing the activation energy needed to get the reaction started.
Which of the following is true about enzymes? a. The active site of an enzyme can be used only once
b. The active site of an enzyme is the region where its substrate binds
c. The active site of an enzyme is identical to that of any other enzyme
d. The active site of an enzyme is not affected by environmental factors such as pH and temperature. correct answers The active site of an enzyme is the region where its substrate binds.
Solutions.
Water molecules are polar because
a.Hydrogen and oxygen atoms form ions when they bond
b.They are key to ice formation
c.Hydrogen and oxygen have very similar electronegativity
d.Hydrogen and oxygen have very different electronegativity correct answers Water molecules are polar because hydrogen and oxygen have very different electronegativities.
Individual water molecules are held together by weak interactions called
a. double bonds
b. ionic bonds
c. covalent bonds
d. hydrogen bonds correct answers Individual water molecules are held together by weak interactions called hydrogen bonds.
Which of the following properties of water is incorrect?
a. it is capable of dissolving lipids
b. it acts as a "universal" solvent
c. it exhibits cohesive behavior
d. it forms a concave meniscus within glass tubes correct answers Water is not capable of dissolving lipids.
Which type of cell does not have a nucleus?
a. Eukaryotic
b. Plant
c. Prokaryotic
d. Animal correct answers Prokaryotic cells do not have a nucleus.
Living organisms and systems avoid major changes in pH through the action of
a. lipids
b. indicators
c. water
d. buffers correct answers Living organisms and systems avoid major changes in pH through the action of buffers.
Which of the following best explains the selective permeability of plasma membranes?
a. lipids cannot enter the cell
b. water cannot enter the cell
c. the plasma membrane allows only certain substances to enter or leave the cell, while others are
excluded d. anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy. correct answers The selective permeability of plasma membranes is described as anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy.
Which of the following refers to the transport of substances down their concentration gradient across a biological membrane WITH the participation of a transport proteins but without the energy input of ATP
a. active transport
b. facilitated diffusion
c. simple diffusion
d. exocytosis correct answers The transport of substances down their concentration gradient across a biological membrane WITH the participation of a transport proteins but without the energy input of ATP is called facilitated diffusion.
Which of the following refers to the transport of substances against their concentration gradient across a biological membrane, into a cell, with the participation of a transport proteins with the energy input of ATP
a. active transport
b. facilitated diffusion
c. simple diffusion
d. exocytosis correct answers The transport of substances against their concentration gradient across a biological membrane, into a cell, with the participation of a transport proteins with the energy input of ATP is called active transport.
The sum total of all the chemical reactions that occur in organisms is called _________.
a. hydrolysis
b. cellular synthesis
c. conservation of energy
d. metabolism correct answers The sum total of all the chemical reactions that occur in organisms is called metabolism.
Enzymes are biological catalysts that increase how fast a reaction occurs. They do this by...
a. Decreasing activation energy needed to get the reaction started
b. Increasing the temperature of the substrates
c. Contributing electrons to the reaction
d. Changing the pH of the environment correct answers Enzymes are biological catalysts that increase how fast a reaction occurs. They do this by decreasing the activation energy needed to get the reaction started.
Which of the following is true about enzymes? a. The active site of an enzyme can be used only once
b. The active site of an enzyme is the region where its substrate binds
c. The active site of an enzyme is identical to that of any other enzyme
d. The active site of an enzyme is not affected by environmental factors such as pH and temperature. correct answers The active site of an enzyme is the region where its substrate binds.
