NEET Zoology Practice Test Paper 1 by TEACHING CARE online tuition and coaching classes
- The process that joins amino acids together to make enzymes is
- dehydration synthesis.
- Which of the following is a unit molecule of hydrolysis?
- ADP when it is being converted into ATP.
- Cellulose when it is being converted into glucose.
- Fatty acids when they are being converted into lipid.
- Amino acids when they are being converted into protein.
- Which of the following is an amino (amine) group?
- The level of protein structure represented by the alpha-helix shape is
- The linear sequence of amino acids found in an enzyme is called its
- tertiary structure.
- primary structure.
- secondary structure.
- Proteins may denature when
- pH is changed.
- oxygen is present.
- they form enzymes.
- substrate concentration is increased.
- When a protein loses its normal three-dimensional configuration, it is said to be A. saturated.
- Which of the following is a function of some proteins?
- Emulsify fats.
- Make up genes.
- Make up cell walls.
- Speed up chemical reactions.
- A glucose molecule contains
- six carbon atoms.
- two high-energy phosphates.
- three fatty acids and glycerol.
- a long chain of
- One of the functions of DNA is to
- secrete vacuoles.
- make copies of itself.
- join amino acids to each other.
- carry genetic information out of the nucleus.
- Two sugars found in nucleic acids are
- sucrose and ribose.
- glucose and fructose.
- deoxyribose and ribose.
- deoxyribose and glucose.
- The number of adenine bases in a DNA molecule equals the number of thymine bases because
- A. DNA contains equal numbers of all four bases.
- B. thymine always follows adenine on each DNA strand.
- C. DNA is made of alternating adenine and thymine bases.
- D. adenine on one strand
bonds to thymine on the other strand.
- Which of the following would not occur during complementary base pairing? A. A-T
- B. U-G
- C. C-G
- D. A-U
- Which of the following describes a DNA molecule?
- Double helix of glucose sugars and phosphates.
- Ladder-like structure composed of fats and sugars.
- Double chain of nucleotides joined by hydrogen bonds.
- A chain of alternating phosphates and nitrogenous bases.
- Which of the following is an example of complementary base pairing?
- Thymine – uracil.
- Guanine – adenine.
- Adenine – thymine.
D.Cytosine – thymine.
- Which of the following is the correct matching of base pairs in DNA?
- Adenine–Guanine and Thymine–Uracil.
- Guanine–Cytosine and Adenine–Uracil.
- Adenine–Thymine and Guanine–Cytosine.
- Guanine–Thymine and Adenine–Cytosine.
- DNA replication involves the breaking of bonds between
- sugars and bases.
- phosphates and bases.
- sugars and phosphates.
- Two functions of rough endoplasmic reticulum are to
- detoxify and transport drugs.
- modify and activate hormones.
- synthesize and transport enzymes.
- join with and hydrolyze food vacuoles.
- In which of the following is the greatest amount of deoxyribonucleic acid (DNA) found?
- nuclear envelope
C 20. Most of the cell membrane is made from
- Which organelle contains enzymes that digest old cells?
- Golgi body
- Specialized vacuoles containing molecules that catalyze the hydrolysis of macromolecules are
- An organelle composed of membranous tubules that synthesize testosterone is the
- Golgi apparatus.
- rough endoplasmic reticulum.
- smooth endoplasmic reticulum.
- The most abundant molecules in the cell membrane are
- A function of smooth endoplasmic reticulum is to
- form ribosomes.
- synthesize lipids.
- store nucleic acid.
- breakdown carbohydrates.
- Carrier molecules that bring materials into cells are
- The fluid-mosaic membrane model describes the membrane as having a
- sheet of protein.
- phospholipid bilayer.
- sugar-phosphate backbone.
- complementary base template.
- Molecules in the cell membrane that function as receptors are
- Cell membranes are composed mainly of
- sugars and phosphates.
- phospholipids and proteins.
- carbohydrates and cellulose.
D.nucleotides and carbohydrates.
- Which of these substances cannot pass through cell membranes?
- Amino acids.
- Which of the following conditions is required for diffusion to occur?
- ATP energy.
- A living cell.
- A concentration difference.
- A selectively-permeable membrane.
- The rate of diffusion across the cell membrane is affected by the
- temperature and pinocytosis.
- temperature and size of the molecule.
- membrane structure and phagocytosis.
- shape of glycolipids and glycoproteins.
- Frog eggs placed in an isotonic solution will
- remain the same.
- increase in volume
- Enzymes function to increase the rate of a metabolic reaction by
- denaturing the substrate.
- adding energy to the reaction.
- decreasing the energy of activation.
- increasing the concentration of the reactants.
- An enzyme speeds up a chemical reaction by
- regulating pH.
- acting as a buffer.
- preventing denaturation.
- lowering the energy of activation.
- The role of an enzyme in a chemical reaction is to
- emulsify fats.
- prevent denaturation.
- speed up the reaction.
- buffer any acids or bases.
- Enzymes often
- absorb fatty acids.
- help in hydrolysis reactions.
- serve as a long term source of energy.
- serve as the structural framework of cell walls.
- In the cell, enzymes act as
- emulsifying agents.
- Enzymes consist of chains of
- fatty acids.
- amino acids.
- Compounds that are needed for enzymes to function properly are
- heavy metals.
- A non-protein molecule that aids the action of an enzyme to which it is loosely bound is called
C.competitive inhibitor. D. enzyme-substrate complex
- Tissue lining the esophagus is
- Which of the following is a connective tissue?
- Similar cells which are joined together form
- a tissue.
- an organ.
- an organ system.
- Tissues that hold structures together and provide support and protection are
- nerve tissues.
- epithelial tissues.
- epidermis tissues.
- connective tissues.
- 1. Organ 2. Cell 3. Organ system 4. Tissue
From left to right, the sequence that represents increasing complexity is
- 1, 3, 2, 4
- 2, 1, 3, 4
- 2, 4, 1, 3
- 2, 4, 3, 1
- Blood is a type of
- nervous tissue.
- epithelial tissue.
- muscular tissue.
- connective tissue.
- Digestion is defined as the process whereby
- glucose is converted to glycogen.
- carbon dioxide is reduced to carbohydrate.
- proteins are absorbed into the bloodstream.
- food is chemically and physically broken down.
- Which of the following describes peristalsis?
- the physical breakdown of fats
- production of vitamins by E. coli
- release of enzymes by the pancreas
- muscle contractions of the digestive tract
- Which type of blood vessel has thick walls in order to withstand high pressure? A. vein
Hints and explainations:-
- Dehydration means to take water out. Thus when you use dehydration synthesis, you are building something up while taking water out.
4. Quaternary Structure is the combination of two or more chains, to form a complete unit. The interactions between the chains are not different from those in tertiary structure, but are distinquished only by being interchain rather than intrachain.
6.Denaturation is a process in which proteins or nucleic acids lose their tertiary structure and secondary structure by application of some external stress or compound, such as a strong acid or base etc
- A -T, G-C
25 Rough endoplasmic reticulua synthesize proteins, while smooth endoplasmic reticulua synthesize lipids and steroids, metabolize carbohydrates and steroids, and regulate calcium concentration, drug detoxification, and attachment of receptors on cell membrane proteins
- Activation energy may also be defined as the minimum energy required to start a chemical reaction
41 A cofactor is a non-protein chemical compound that is bound to a protein and is required for the protein’s biological activity. These proteins are commonly enzymes, and cofactors can be considered “helper molecules” that assist in biochemical transformations. Cofactors can also be classified depending on how tightly they bind to an enzyme, with loosely-bound cofactors termed coenzymes and tightly-bound cofactors termed prosthetic groups.