Day: July 8, 2023

1. The electron clouds around the nucleus are of ___________a) Spherical shapeb) Spherical and Dumbbell shapec) Spherical and Hexagonal shaped) Cannot be determined Answer: bExplanation: Electrons swarm around the nucleus of an atom in a mostly unpredictable fashion. Erratic electron behaviour is best described by the electron cloud model. The electron cloud is an area around the nucleus of an atom where electrons are most likely to be found. The clouds are roughly defined by their boundaries which is either spherical or dumbbell shape. 2. Atoms or molecules having orbitals containing a single unpaired electron is known as ___________a) Captionsb)

1. Which monomers compose the strands of nucleic acids?a) Amino acidsb) Ribosec) Functional groupsd) Nucleotides Answer: dExplanation: The strands of nucleic acids are composed of monomeric units called nucleotides. Nucleic acids are mainly the storage sites for genetic information and also have structural and catalytic functions. 2. What are the types of nucleic acids are found in living organisms?a) deoxyribonucleic acid & nucleotide acidb) deoxyribonucleic acid & ribonucleic acidc) ribonucleic acid & nucleotide acidd) ribonucleic acid & nucleoside acid Answer: bExplanation: Two types of amino acids are found in living organisms namely DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). DNA

1. In an amino acid, the carboxyl group and amino group are separated from each other by a single ____________ atom.a) nitrogenb) sulphurc) hydrogend) carbon Answer: dExplanation: Proteins are polymers containing amino acids as monomers. There are twenty different types of amino acids, with varying functional groups. Every amino acid has a carboxyl group and an amino group separated by a single carbon atom between them. 2. Amino acids used in the synthesis of proteins on a ribosome are ________________a) D-amino acidsb) Mutated amino acidsc) L-amino acidsd) Fluorescing amino acids Answer: cExplanation: Explanation: In most organisms including humans, the L

1. Lipids cannot dissolve in _____________a) organic solventsb) chloroformc) benzened) water Answer: dExplanation: Lipids are vital biomolecules that have a characteristic property of being able to dissolve in organic solvents such as benzene and chloroform and their inability to dissolve in water. 2. Which types of bonds are found in fats?a) amideb) glycosidicc) esterd) acidic Answer: cExplanation: Fatty acids consist of one glycerol moiety linked to three fatty acids via ester bonds; the composite molecule is called triacylglycerol or neutral fat. 3. How many carboxyl groups are present in fatty acids?a) 1b) 2c) 3d) 4 Answer: aExplanation: Fatty acids are

1. The genetic material of a prokaryote is present in the ______________a) Nucleusb) Cytoplasmc) Nucleoidd) Plasmid Answer: cExplanation: Bacteria does not contain a true nucleus. Nucleoid is a poorly demarcated region of the cell that contains the bacterial genetic material or bacterial DNA. 2. Which of the following is not true for both prokaryotic and eukaryotic cells?a) Same composition of plasma membraneb) Both contain shared metabolic pathwaysc) Genetic information encoded in DNA with similar genetic coded) Both contain Golgi apparatus for protein trafficking Answer: dExplanation: Prokaryotic cells do not have organelles such as Golgi Apparatus. However, the composition of plasma

1. Heptoses are __________ a) sugars b) proteins c) amino acids d) monomers Answer: a Explanation: Heptoses are carbohydrates that contain 7 atoms of carbon. The sugars of importance in cellular metabolism contain 3 to 7 carbon atoms. 2. Fructose is a _____________ a) aldose sugar b) ketose sugar c) monosaccharide d) polymer Answer: b Explanation: Fructose is a ketose sugar because the carbonyl group (C==O) is located in an internal position to form a ketone group. If the carbonyl bond is located at one end of the sugar it is called aldose sugar. 3. The compounds which have same

1. Which of the following is released when a Hydrogen atom loses an electron?a) Nucleusb) Protonc) Charged) Ion Answer: bExplanation: Whenever a hydrogen atom releases a shared electron in solution, a proton is also released. For example, acetic acid undergoes dissociation reaction to release acetate ion and a proton. 2. Which of the following is an example of amphoteric molecule?a) Acetic acidb) Malic acidc) Sugarsd) Water Answer: dExplanation: Water is an example of both an acid and a base, and is therefore an amphoteric molecule. It can accept a proton thereby acting as a base and can also donate a