hiI have 50 question on biology,many of these question you can find it in quiz let.there are two question with picture (20 , 26) I will attached.Question 1 A complex polymer built of amino acids is called a(n) monosaccharide. polypeptide. fatty acid. polysaccharide. amine.Question 2 Glycogen belongs in the class of molecules known as polysaccharides. monosaccharides. amino acids. proteins. nucleic acids.Question 3 Pure water has a pH of 7.0. Cola has a pH of about 3.0. That means cola is 10,000 times more basic than water. 10,000 times more acidic than water. about 40 times more acidic than water. about 40 times more basic than water. about 4 times more acidic than water.Question 4 The pH of a fluid is a measure of its capacity to function as soap. its enzymatic stability. the concentration of phosphate groups. the amount of adenosine triphosphate (a-pH) in it. how acidic or basic it is.Question 5 All lipids are triglycerides. not soluble in water. polar. hydrophilic. polymers of fatty acidsQuestion 6 Phosphate groups are important components of nucleic acids. structural polysaccharides. amino acids. triglycerides. All of the above answer choices are correct.Question 7 Enzymes sometimes increase the amount of energy necessary to initiate a reaction. increase the rate at which a reaction occurs. catalyze reactions that release energy, but not those that consume energy. are always consumed by catalyzing a reaction. reduce the energy released by a reaction by one of four different mechanisms.Question 8 Relative to protons, electrons have significantly greater mass. significantly less mass. approximately the same mass. a significantly stronger positive charge. None of the above is correct. Electrons have no mass.Question 9 Pure water and aqueous solutions that are neither acidic nor basic are said to be transparent. buffers. translucent. neutral. alkaline.Question 10All macromolecules important in living systems contain potassium. nitrogen. polymers. aldehydes. carbon.Question 11 Carbohydrates in the form of oligosaccharides are often covalently bonded to proteins and lipids on the outer cell surface, where they serve as cell recognition signals. are a good source of sustained energy when they come in the form of polysaccharides. serve as carbon skeletons that can be rearranged to form other molecules that are essential for biological structures and functions like nucleic acids. act as a relatively fast available source of fuel. All of the above answer choices are correct.Question 12 Phenylketonuria is an inherited disorder. Affected individuals have a defective enzyme called phenylalanine hydroxylase. The substance these individuals cannot break down is a(n) carbohydrate. nucleic acid. amino acid. protein. lipid.Question 13 All of the following are proteins EXCEPT hemoglobin. an enzyme. an antibody. insulin. cholesterol.Question 14 DNA is made of fatty acids. amino acids. glucose molecules. four interconnected carbon rings. nucleotides.• Question 15 A nucleotide consists of a phosphate group, a pentose sugar, and a __________________, all linked together by covalent bonds. potassium-containing base polypeptide phosphorus-containing base nitrogen-containing base triglycerideQuestion 16 Human sex hormones are classified as which type of biological molecule? enzyme lipid nucleic acid protein carbohydrateQuestion 17 Of all the elements that occur on Earth, how many are found in your body? 116 4 90 10 25Question 18 Lactose is a combination of glucose and ribose. glucose and fructose. glucose and maltose. glucose and galactose. sucrose and fructoseQuestion 19 An atom of iron has the atomic number 26. This means that it has 52 protons. 13 neutrons. an atomic mass of 26. 26 protons. 13 electrons.Question 20How many hydrogen bonds are explicitly represented in this graphic? 1 8 0 4 10Question 21 Helium is not a reactive molecule because its first-level shell is full with two electrons. first-level shell is full with two protons. second-level shell is full with two electrons. first-level shell is full with two neutrons. Helium is a reactive moleculeQuestion 22 A chemical compound that releases OH– into a solution is called a(n) hydroxide ion. solvent. salt. base. acid.Question 23 The Russian-American biochemist Phoebus Levene was the first to determine that nucleotides may contain one of four different nitrogen-containing bases. Levene believed that the nitrogen-containing bases occurred in equal amounts in DNA. What is the actual proportion of these bases? DNA contains twice as much of adenine and thymine as guanine and cytosine. All four do actually occur in equal amounts. Levene was right. DNA contains equal amounts of guanine and thymine, and equal amounts of adenine and cytosine. DNA contains equal amounts of adenine and guanine, and equal amounts of thymine and cytosine. DNA contains equal amounts of adenine and thymine, and equal amounts of guanine and cytosineQuestion 24 A(n) __________ is the smallest chemical unit of a type of pure substance. cell molecule amino acid atom protonQuestion 25 Certain molecules act like bank accounts for H+ ions because they can absorb excess H+ ions to keep a solution from becoming too acidic and release H+ ions to keep the solution from becoming too basic. Such molecules are called enzymes. oxidating agents. reducing agents. buffers. catalysts.Question 26 The diagram below represents which class of chemical compounds? sterols proteins carbohydrates acids fatsQuestion 27 Figuratively, the primary structure of proteins is often described as amino acids connected like “beads on a string.” In this same vein, which of the following images BEST describes protein quaternary structure? threads in a cloth coils in a spring rungs on a ladder needle in a haystack links on a chainQuestion 28 All matter on Earth, both living and non-living, is made up of cells. DNA. carbohydrates. phospholipids. atoms.Question 29 On food packages, “insoluble fiber” refers to plant material that we cannot fully digest but is important for maintaining a healthy digestive tract. This substance refers to a(n) nucleic acid. carbohydrate. protein. lipid. amino acid.Question 30 The principal components of cell membranes are carbohydrates. proteins. nucleic acids. lipids. glycoproteins.Question 31 All of the following are components of a single amino acid EXCEPT a(n) carboxyl group. nitrogen-containing amino group. variable side chain. alpha carbon. All of the above are components of a single amino acid.Question 32 Saturated fatty acids have _________________ than unsaturated fatty acids, which is why they exist as a ____________ at room temperature. fewer hydrogen atoms; solid more double bonds; liquid more carbon atoms; solid more glycerol molecules; liquid fewer double bonds; solidQuestion 33 A buffer is a chemical that can quickly absorb excess H+ ions to keep a solution from becoming too acidic. can quickly release H+ ions to counteract any increases in the OH– concentration in a solution. is identical to baking soda. restores the pH of a solution to 7.0. Both the first and second answer choices are correct.Question 34 Multiple atoms linked together are called a(n) reactant. isotope. substrate. molecule. element.Question 35 Organic molecules consisting of only hydrogen and carbon are called carbohydrates. hydroxyls. enantiomers. fats. hydrocarbons.Question 36 Evaporation from the leaves of a tree will pull water up through the roots as an unbroken column throughout the entire height of the tree. This feat is possible because of which characteristic of water? surface tension cohesion absorption kinetic energy vaporizationQuestion 37 Sucrose (table sugar) and lactose (the sugar found in milk) are examples of simple sugars. disaccharides. monosaccharides. naturally occurring enzymes. polyunsaccharide sugarsQuestion 38 One important difference between covalent and ionic bonds is that ionic bonds are much stronger than covalent bonds. in ionic bonds two atoms share electrons, whereas in covalent bonds one atom gives one or more electrons to the other atom. in covalent bonds two atoms share electrons, whereas in ionic bonds one atom gives one or more electrons to the other atom. in ionic bonds both protons and electrons can be shared, whereas in covalent bonds only electrons can be shared. ionic bonds only occur among water-soluble elements.Question 39 In DNA, adenine from one strand binds to ______ in the complementary strand. thymine adenine uracil cytosine guanineQuestion 40 An amino acid is to a polypeptide as glycogen is to glucose. a nucleotide is to a nucleic acid. a phospholipid is to a plasma membrane. a nucleic acid is to DNA. testosterone is to a steroid hormoneQuestion 41 Phospholipids assemble spontaneously into bilayers driven by the attraction of their “tail” portions to each other and of their “head” portions to each other. The tail regions are hydrophilic. molecularly charged. hydrophobic. adhesive. cohesive.Question 42 Glycoproteins are membrane proteins with bound signaling peptide sequences. cofactors. carbohydrates. phospholipids. nucleic acids.Question 43 A polypeptide chain is a linear polymer of amino acids. Peptide bonds are present between which of the two following groups? the carbon atom of the carboxyl group and the nitrogen atom of the amino group the carbon atom of the carboxyl group and the adjacent carbon atom of the chain’s backbone the carbon atom of the carboxyl group and the oxygen atom double-bonded to it the carbon atom of the carboxyl group and the OH bound to it All of the above answer choices are correct.Question 44 A solution’s acidity is a measure of the H+ (free-floating protons) it contains. the number of all dissolved molecules in a solution. the number of nucleotide bases in the solution. the amount of buffer molecules in the solution. its negative charge (the stronger the negative charge, the more acidic the substance)Question 45Carbon-14 has the same atomic number and atomic mass as carbon-12. atomic number and, therefore, the same number of neutrons as carbon-13. atomic mass as both carbon-12 and carbon-13. number of protons but more neutrons than carbon-12. atomic mass and, therefore, the same number of neutrons as carbon-12.Question 46 The four most abundant elements in living organisms are carbon, nitrogen, oxygen, and calcium. carbon, nitrogen, potassium, and oxygen. sodium, nitrogen, carbon, and silicon. hydrogen, nitrogen, oxygen, and carbon. carbon, hydrogen, nitrogen, and phosphorusQuestion 47 The fact that water is less dense as a solid than as a liquid explains why ice floats on top of liquid water. water is such a good solvent. water can resist temperature changes. ice cubes sink when placed in a glass of water. oil never dissolves in waterQuestion 48 One of the four nucleotide bases in DNA is replaced by a different base in RNA. Which base is it, and what is it replaced by? adenine, replaced by uracil thymine, replaced by uracil guanine, replaced by cytosine thymine, replaced by guanine cytosine, replaced by guanineQuestion 49 Energy derived from cellular respiration can originate from carbohydrates, proteins, and fats. carbohydrates only. carbohydrates and proteins only. proteins only. fats only.Question 50 An unsaturated fatty acid is one in which carbon-carbon double bonds are present in the hydrocarbon chain. an odd number of subunits are present in the hydrocarbon chain. an even number of subunits are present in the hydrocarbon chain. carbon-carbon double bonds are not present in the hydrocarbon chain. not all of the carbons in the hydrocarbon chain are bonded to hydrogen atoms.