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Unit 1 Test

AP Bio

QuestionAnswer
Molecules with the same number of carbons and other atoms may behave differently if the atoms are arranged exactly the same False , differently
The carbon that makes our bodies comes from plants, who get carbon from the atmosphere, not the soil True
Hydrogen bonds are weak attractions between the oxygen of one water molecule and the hydrogen of another water molecule, and can lead to adhesion between water molecules False Cohesion
RNA contains adenine, cystine, guanine, and cytosine for bases False, uracil
In general, more bonds in a molecule will increase the stability of the molecule True
Dehydration synthesis involves the removal of a water molecule to make polymers out of monomers, and hydrolysis involves the addition of a water molecule to break polymers into monomers True
Amino acids have an amino group on one end and a carboxyl group on the other. When joined together, the amino group can bind with another amino group, forming a dipeptide through dehydration synthesis False,The carboxyl group of one amino acid and the amino group of the incoming amino acid combine, releasing a molecule of water and creating the peptide bond.
DNA is double stranded where sides run in opposite directions True
In DNA , Adenine-Thymine base pairs denature more easily than Guanine-Cytosine base pairs , since they use more hydrogen bonds False , less
Predator species are dependent on their prey. If prey population decrease, the predator populations will increase False , decrease
Hydrogen bonding occurs between the hydrogen, with a positive charge, on one molecule, and a positively charged atom in a different molecule False, negatively
Hydrolysis of carbohydrates involves the addition of water to break monomers apart True
Remember that organisms cannot make new elements from existing elements. They may be able to break down molecules, such as breaking down glucose into smaller molecules, but they can't change a carbon atom into an oxygen atom True
When a protein is folded into its tertiary structure, the hydrophobic amino acids will tend to fold towards water, and the hydrophilic amino acids will fold towards the water False -away
Dehydration synthesis in proteins is the removal of water to unite amino acids True
Dehydration synthesis in proteins is the removal of water to unite amino acids True
When two amino acids are joined together in a growing protein, a special covalent bond called peptide created between them. True
Adhesion is when water molecules, which are polar are attracted to other molecules which are polar True
Polysaccharides can exist as chains or branched chains of amino acid monosaccharides True
Dehydration synthesis of large molecules, including proteins and carbohydrates, involves the removal of water as a byproduct True
Proteins can be broken down into polypeptides and individual amino acids by the process of hydrolysis True
Most sugars and lipids are made of just carbon, hydrogen, and oxygen. But the synthesis of proteins and nucleic acids require nitrogen also True
Surface tension is the result of hydrogen bonding between water molecules at the surface of a body of water True
The bases within DNA are held together by weaker hydrogen bonds, and can easily be disrupted with high energy exposure, such as heat or UV radiation True
surface tension Surface tension. measure of how difficult it is to stretch or break the surface of a liquid. example Water forming a droplet as it falls from a faucet
Water Transport in a plant (Capillary Action ) Plants do not have the ability to actively transport water to their respective cells. Instead, water undergoes capillary action, which allows it to flow upward against gravity
Hydrophobic a property of a substance that repels water. It means lacking affinity for water, and tending to repel or not to absorb water. Hydrophobic molecules tend to be non-polar molecules and group together. Oils and fats are hydrophobic.
Hydrophilic refers to having a strong affinity for water. Something that is hydrophilic is soluble in water and dissolves into water very easily. for example aluminium foil
Created by: bellam08
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