Enzymes are proteins that act as catalysts to speed up chemical reactions within cells. The specific shape at the opening of anenzyme is called the active site. Only a specific molecule fits into an active site and binds to the enzyme. The molecule is thenconverted into products and released from the enzyme. Digestive enzymes help to break food down into nutrients that the body needs.The diagram shows the amino acids that are found in a digestive enzyme.EDigestive enzyme 1Two other digestive enzymes are shown.C?Digestive enzyme 2Digestive enzyme 3Which statement BEST describes the three enzymes?OA The enzymes have different structures because they have a different sequence of amino acids.OB The enzymes have the same sequence of amino acids because they are all digestive enzymes.OC The enzymes perform different functions because they have the same sequence of amino acids.hpO° The enzymes break down the same molecules because they have a different sequence of amino acids.C ProteinsProteins are abundant in living systems. They are involved in almost all aspects of a cell's ability tomaintain homeostasis. Different types of proteins include enzymes, transport proteins, hormones,structural proteins, defense proteins, storage proteins, and contractile proteins. Due to the differences intheir structure, proteins perform various functions including carrying substances throughout the body,constructing new structures, aiding in digestion, and coordinating the activities of the body. All cells builddiverse proteins using the same building blocks of amino acids. There are 20 different amino acids thatcan be combined to make a protein. Structural similarities within amino acids allow for protein synthesisto be a regulated process, while differences within amino acids allow for interactions that create uniqueprotein structures. An amino acid attaches to another amino acid by a peptide bond, forming a peptide.Polypeptides are formed when many amino acids link together to form a chain. Proteins are created asamino acids in one or more polypeptide chemically interact, fold, and create their three-dimensionalstructure. The diagram shows the formation of a protein.Aminoacids-Peptide-PolypeptideProteinEnzspeintorelebodTwo

The active site is the region on the enzymes where substrate molecules bind and the chemical…

Enzymes are proteins that act as catalysts to speed up chemical reactions within cells. The specific shape at the opening of an enzyme is called the active site. Only a specific molecule fits into an active site and binds to the enzyme. The molecule is then converted into products and released from the enzyme. Digestive enzymes help to break food down into nutrients that the body needs. The diagram shows the amino acids that are found in a digestive enzyme. Digestive enzyme 1 Two other digestive enzymes are shown. A Digestive enzyme 2 Digestive enzyme 3 Which statement BEST describes the three enzymes? B O ? ? D The enzymes have different structures because they have a different sequence of amino acids. O C The enzymes perform different functions because they have the same sequence of amino acids. The enzymes have the same sequence of amino acids because they are all digestive enzymes. The enzymes break down the same molecules because they have a different sequence of amino acids.

Enzymes are proteins that act as catalysts to speed up chemical reactions within cells. The specific shape at the opening of an enzyme is called the active site. Only a specific molecule fits into an active site and binds to the enzyme. The molecule is then converted into products and released from the enzyme. Digestive enzymes help to break food down into nutrients that the body needs. The diagram shows the amino acids that are found in a digestive enzyme. Digestive enzyme 1 Two other digestive enzymes are shown. A Digestive enzyme 2 Digestive enzyme 3 Which statement BEST describes the three enzymes? B O ? ? D The enzymes have different structures because they have a different sequence of amino acids. O C The enzymes perform different functions because they have the same sequence of amino acids. The enzymes have the same sequence of amino acids because they are all digestive enzymes. The enzymes break down the same molecules because they have a different sequence of amino acids.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter4: Cell Structure

Section: Chapter Questions

Problem 4SA: Cell membranes consists mainly of ________ and ________ . a. lipids; carbohydrates c. lipids;...

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Although lipids are largely responsible for providing and maintaining the structure of the Ven membrane, most of the membrane's functions are due to the proteins that are present in it. Membrane proteins can be classified as integral or peripheral, depending on how they are Posiioned in the phospholipid bilaver. Based on figure 12, differentiate integral and peripheral proteins. Write your answer on the table below. Table 18: Difference Between Integral and Peripheral Membrane Proteins Integral Proteins Peripheral Proteins
Cellular memberane are mainly constructed of a phospholipid bilayer with emnedden cholesterol and proteins. Tues or False
None of the above Which of the following is amphipathic? O Phospholipids. O Integral proteins. Peripheral proteins O Phospholipids and integral proteins zyme ity is the best at:
b) Cellular membranes are generally found in environments that contain lots of water. Draw a diagram of what the phospholipid bilayer of a plasma membrane would look like if it were placed in a hydrophobic environment. (**Note that you only have to draw the phospholipid bilayer, you don't have to draw the other major components again as you did in part a) poned In salt wer (ho byorout obods f.Cplan why sctive tnsport is requind in tive tre nolaib beisio c) What part or parts of a cellular membrane play(s) a role in determining the fluidity of the membrane? pslomlo below
Cell membranes consists mainly of ________ and ________ . a. lipids; carbohydrates c. lipids; phospholipids b. phospholipids; protein d. phospholipids; ECM
C) In biology, a very important concept is that evolution has produced organisms whose structures best perform their required function in the organism. Amazingly, this holds true for ll the levels of organization of matter from whole body parts right down to the molecules that they are made of. The function of glycogen in the body is long-term energy storage. Explain in detail how the chemical structure of glycogen corresponds to this function. aymere te heresuls of le-rancois cthesis that bre chansed. Prop 4) o bod lesinsdo to sod sdoteM viol leounlolovel" slguleov brod Iesims to sgt a) List the major differences in molecular structure between a triglyceride and a phospholipid. avel ln loss ol viq 3 16 100 10 bod obidal
All the following is a function of membrane proteins EXCEPT: Cell-cell contact O Protein synthesis Transporting substances cross the membrane O Enzymatic activity which of the following sentences are INCORRECT: All living things are composed of one cells all cells have the same size The cell is the basic structural, O functional, and biological unit of all organisms Robert Hook discovered the cells
. Cholesterol is an integral part of plasma membranes. Based on its structure, where is it found in the membrane? On the extracellular surface embedded with the phospholipid heads within the tail bilayer attached to the intracellular surface
Why might adding a strong reducing agent like Dithiothreitol (DTT) help denature an extracellular protein? O Disulfide bonds might be reduced that might be critical in stabilizing its structure O Disulfide bonds might be oxidized that might be critical in stabilizing its structure O Disulfide bonds formed inside the cytoplasm can be oxidized O Cysteines can be reduced to form stabilizing disulfide bonds
An important aspect of transport by facilitated transporters and pumps is _______. rigidity secondary structure change of amino acids conformational changes
For the lipids within the bilayer that comprise the plasma membrane: O The hydrophilic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells, with hydrophobic ends buried in the center of the lipid bilayer. The hydrophobic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells, with hydrophilic ends buried in the center of the lipid bilayer. The hydrophilic ends face the outside (extracellular/exoplasmic face) of the cells and the hydrophobic ends face inside (cytoplasmic face) of the cells. O Hydrophobic and hydrophilic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells randomly. The hydrophobic ends face the outside (extracellular/exoplasmic face) of the cells, the hydrophilic ends face inside (cytoplasmic face) of the cells.
Cholesterol is an integral part of plasma membranes. Based on its structure, where is it found in the membrane? O within the tail bilayer O on the extracellular surface O embedded with the phospholipid heads O attached to the intracellular surface