All seven topics of AP Bio Unit 1, from water and hydrogen bonding to protein structure: flashcards and practice questions. Free.
Subject: biology
Which property of water is primarily responsible for its ability to maintain a stable internal temperature in organisms, preventing drastic fluctuations?
Answer: High specific heat capacity
Water's high specific heat capacity means it can absorb or release a large amount of heat with only a slight change in its own temperature, which is crucial for maintaining homeostatic body temperature in organisms.
A scientist observes a macromolecule that contains carbon, hydrogen, oxygen, and nitrogen. Based on this elemental composition, which type of macromolecule is it most likely to be?
Answer: A protein
While carbon, hydrogen, and oxygen are prevalent in all listed macromolecules, nitrogen is specifically mentioned as an additional element used to build nucleic acids and, implicitly, proteins (as amino acids contain an amine group). Among the choices, proteins are the most direct fit for containing nitrogen in addition to C, H, O.
Which statement accurately describes the role of water in the formation of biological macromolecules?
Answer: Water is removed when monomers are joined by dehydration synthesis.
Dehydration synthesis is the process that joins smaller molecules (monomers) through covalent bonding by removing a hydrogen ion from one monomer and a hydroxyl group from another, resulting in the loss of one water molecule.
A food product lists 'partially hydrogenated vegetable oil' as an ingredient. This process converts unsaturated fatty acids into a more saturated form. How would this change affect the physical state of the oil at room temperature?
Answer: It would become more solid due to the removal of kinks in the fatty acid chains.
Unsaturated fatty acids contain double bonds that cause kinks, making them more liquid at room temperature. Hydrogenation reduces these double bonds, making the fatty acids more saturated. Saturated fatty acids, with only single bonds, can pack more closely together, leading to a more solid state at room temperature.
Which of the following accurately describes a key structural difference between DNA and RNA that impacts their typical configurations?
Answer: DNA contains deoxyribose sugar, while RNA contains ribose sugar, influencing stability.
DNA contains deoxyribose sugar, which lacks an oxygen atom on the 2' carbon, making it more stable. RNA contains ribose sugar, which has a hydroxyl group on the 2' carbon, making it more reactive and less stable. This is a fundamental structural difference.
What is the primary factor that determines the specific sequence of amino acids in a protein's primary structure?
Answer: The genetic information encoded in nucleic acids.
The primary structure of a protein is defined by the specific, linear sequence of amino acids. This sequence is directly dictated by the genetic code carried by nucleic acids (DNA and RNA) through transcription and translation.
Which statement best explains how the tertiary structure of a protein is formed and maintained?
Answer: It is the three-dimensional shape resulting from interactions between R groups.
Tertiary structure is the overall three-dimensional shape of a single polypeptide chain, which is primarily determined by various interactions (hydrogen bonds, hydrophobic interactions, ionic interactions, or disulfide bridges) occurring between the R groups of the amino acids.
Water exhibits {0} arising from polar covalent bonds between hydrogen and oxygen.
Answer: polarity
Water's polarity is due to the uneven sharing of electrons in its polar covalent bonds.
Water's polarity contributes to {0} within and between biological molecules.
Answer: hydrogen bonding
Hydrogen bonds form between the partially positive hydrogen of one water molecule and the partially negative oxygen of another.
{0} involves cleaving covalent bonds, breaking molecules into smaller units by adding water.
Answer: Hydrolysis
Hydrolysis is a chemical reaction where water is used to break down a compound.
{0} joins smaller molecules through covalent bonding by removing a water molecule.
Answer: Dehydration synthesis
Dehydration synthesis reactions build larger molecules from smaller ones by removing water.
The addition of water to the bond between {0} breaks that bond during hydrolysis.
Answer: monomers
Monomers are the building blocks that are joined together to form polymers.
Many monomers connecting through dehydration synthesis forms {0}.
Answer: polymerization
Polymerization is the process of forming a polymer from monomers.
A {0} contains only single bonds between carbon atoms.
Answer: saturated fatty acid
Saturated fatty acids lack double bonds in their hydrocarbon chain.
{0} contain at least one double bond, which causes a kink in the chain.
Answer: Unsaturated fatty acids
The double bonds in unsaturated fatty acids prevent tight packing, making them more liquid at room temperature.
Biological information is encoded in the sequence of {0} monomers.
Answer: nucleotide
Nucleotides are the building blocks of nucleic acids like DNA and RNA.
{0} is structured as an antiparallel double helix.
Answer: DNA
DNA's double helix structure allows for stable storage of genetic information.
In {0}, adenine pairs with uracil.
Answer: RNA
RNA uses uracil instead of thymine, which pairs with adenine.
{0} contain a central carbon atom bonded to a hydrogen atom, a carboxyl group, an amine group, and a variable R group.
Answer: Amino acids
Amino acids are the monomers that make up proteins.
Proteins are composed of linear chains of amino acids connected by covalent {0}.
Answer: peptide bonds
Peptide bonds are formed between the carboxyl group of one amino acid and the amine group of another.
The specific sequence of amino acids determines a protein's {0} and its overall shape.
Answer: primary structure
The primary structure is the unique linear sequence of amino acids in a polypeptide chain.
{0} is the three-dimensional shape resulting from hydrogen bonds, hydrophobic interactions, ionic interactions, or disulfide bridges.
Answer: Tertiary structure
Tertiary structure involves the overall folding of a single polypeptide chain into a specific 3D shape.
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