Description : Which of the following correctly matches an organelle with its function? (A) Mitochondrion . . . photosynthesis (B) Nucleus . . . cellular respiration (C) Ribosome . . . manufacture of lipids (D) Central vacuole . . . storage
Last Answer : (D) Central vacuole . . . storage
Description : What is the main cell organelle involved in cell digestion ?
Last Answer : What are the properties of that organelle that enable it to the task? The organelles responsible for intracellular digestion are the lysosomes. Lysosomes are vesicles that contain digestive enzymes ... digested and then digestion takes place. Cell Digestion Review - Image Diversity: lysosomes
Description : On which organelle of the cell structure does intracellular digestion depends ?
Last Answer : What is the chemical content of those organelles? Intracellular digestion occurs by the action of lysosomes. Lysosomes have digestive enzymes (hydrolases) that are made in the rough endoplasmic ... apparatus. Lysosomes are hydrolase-containing vesicles that detach from the Golgi apparatus.
Description : Biochemically the ribosome consists of _______________ and some 50 structural . (A) mRNA, Carbohydrates (B) tRNA, lipids (C) mRNA, Proteins (D) rRNA, Proteins
Last Answer : (D) rRNA, Proteins
Description : Nissl’s bodies are mainly composed of (a) proteins and lipids (b) DNA and RNA (c) nucleic acids and SER (d) free ribosomes and RER.
Last Answer : (d) free ribosomes and RER.
Description : Which of the following are not polymeric? (a) Proteins (b) Polysaccharides (c) Lipids (d) Nucleic acids
Last Answer : (c) Lipids
Description : Which of the following are not polymeric ? (1) Proteins (2) Polysaccharides (3) Lipids (4) Nucleic acids
Last Answer : (3) Lipids
Description : Nissl bodies are mainly composed of (1) Proteins and lipids (2) DNA and RNA (3) Nucleic acids and SER (4) Free ribosomes and RER
Last Answer : (4) Free ribosomes and RER
Description : In which of the following class of substances would WAX be found? w) carbohydrates x) lipids y) proteins z) nucleic acids
Last Answer : ANSWER: LIPIDS
Description : Peptide bonds are found in: a) carbohydrates b) lipids c) nucleic acids d) proteins
Last Answer : ANSWER: D -- PROTEINS
Description : Nutrasweet, the artificial sweetener, contains molecules in which of the following groups? w) carbohydrates x) lipids y) amino acids z) nucleic acids
Last Answer : ANSWER: C--AMINO ACIDS
Description : Which organelle releases oxygen (A) Mitochondrion (B) Chloroplast (C) Glyoxysome (D) Both A and B
Last Answer : (B) Chloroplast
Description : Which of the following is NOT a membranous organelle? (A) Lysosomes (B) Peroxisomes (C) Centrioles (D) Mitochondria
Last Answer : (C) Centrioles
Description : The largest organelle in a mature living plant cell is the (A) Chloroplast (B) Nucleus (C) Central vacuole (D) Dictyosomes
Last Answer : (C) Central vacuole
Description : In which organelle following reaction takes place 6 CO2 + 6 H2O + energy (from sunlight) ---------> C6H12O6 + 6 O2 (A) Mitochondrion (B) Peroxisome (C) Chloroplast (D) Glyoxysome
Last Answer : (C) Chloroplast
Description : ″Proteins icebergs in a sea of lipids” is stated by (A) Lamellar Model (B) Unit-membrane Model (C) Fluid-Mosaic model (D) Micellar Model
Last Answer : (C) Fluid-Mosaic model
Description : The overall goal of glycolysis, Krebs’ cycle and the electron transport system is the formation of (a) ATP in one large oxidation reaction (b) sugars (c) nucleic acids (d) ATP in small stepwise units
Last Answer : d) ATP in small stepwise units.
Description : .Plasma membrane is made of (a) proteins and carbohydrates (b) proteins and lipids (c) proteins, lipids and carbohydrates (d) proteins, some nucleic acid and lipids.
Last Answer : (c) proteins, lipids and carbohydrates
Description : In what category may LIPASE (pron: lie-pase) be placed w) carbohydrates x) lipids y) enzymes z) nucleic acids
Last Answer : ANSWER: C--ENZYMES
Description : What is autophagic intracellular digestion ?
Last Answer : Why is this type of intracellular digestion intensified in an organism undergoing starvation? Autophagic intracellular digestion is the cellular internal digestion of waste and residual materials. In general ... obtain from its own constituent materials the nutrients necessary to stay alive.
Description : What is heterophagic intracellular digestion ?
Last Answer : How is this process accomplished? Heterophagic intracellular digestion is the breaking into smaller substances of external substances engulfed in the cell by pinocytosis or phagocytosis. Phagosomes or pinosomes fuse ... with the plasma membrane and liberates its waste in the exterior space.
Description : What is intracellular digestion ?
Last Answer : Intracellular digestion, or cellular digestion, is the breaking in the interior of the cell of big molecules coming from outside or even from the own cell metabolism into smaller ... is classified into two types: heterophagic intracellular digestion and autophagic intracellular digestion.
Description : What is extracellular digestion ?
Last Answer : Extracellular digestion is that in which food breaking into utile molecules that can be internalized by the cell is done in the extracellular space, i.e., outside the cell. In extracellular digestion ... the external environment. Later the cell can benefit from these products of the digestion.
Description : The process of self-digestion of selective non-functional organelles by a cell through the action of enzymes originating within the cell is referred to as (A) Pinocytosis (B) Endocytosis (C) Autophagy (D) Cytotoxicity
Last Answer : (C) Autophagy
Description : Which of the following structure-function pairs is mismatched? (A) Lysosome-intracellular digestion (B) Golgi body-secretion of cell products (C) Ribosome-protein synthesis (D) Glyoxysome-detoxification
Last Answer : (D) Glyoxysome-detoxification
Description : Bile has what function in digestion? a) emulsify lipids b) digest proteins c) gluconeogenesis (pron: glue-ko-nee-o-gen-e-sis) d) digest carbohydrates
Last Answer : ANSWER: A -- EMULSIFY LIPIDS
Description : Are the levels of the cyclins constant throughout the cell cycle?
Last Answer : No. Cyclins are synthesized only when required and then they are degraded by specific enzymes at defined times in the cell cycle.
Description : How do the rough endoplasmic reticulum and the Golgi apparatus act in the production and releasing of proteins ?
Last Answer : The rough endoplasmic reticulum has in its outer membrane numerous ribosomes, structures where translation of messenger RNA and protein synthesis occur. These proteins are stored in the rough endoplasmic reticulum ... exocytosis) in the right place and its content is liberated outside the cell.
Description : Without saturation of transport proteins and under same concentration gradient how can the speed of simple diffusion be compared to the speed of facilitated diffusion ?
Last Answer : The action of facilitator proteins in facilitated diffusion makes this type of diffusion faster than simple diffusion under equal concentration gradients of the moved substance.
Description : In many types of cancer, proteins that are crucial regulators of the cell cycle are often mutated and cannot function correctly. This leads to the evasion of apoptosis and to the loss of control of cell ... protein named p53. What is the normal function of p53 that is lost when it is mutated?
Last Answer : Normally, p53 senses DNA damage and acts as a transcription factor for checkpoint control genes.
Description : In order to function, CDKs must interact with members of a separate family of proteins named the cyclins. Do individual cyclins remain associated with the same CDKs throughout the entire cell cycle?
Last Answer : No. Separate cyclins interact with specific CDKs only during defined periods of the cell cycle.
Description : Multiple checkpoints in the eukaryotic cell cycle ensure that division occurs only after sufficient growth and faithful DNA replication, and only when favorable conditions exist. Of the many proteins involved in ... CDKs) are among the most important. How do CDKs function to control the cell cycle?
Last Answer : CDKs phosphorylate various protein substrates that are required for cell cycle progression. Some of the important substrate proteins that CDKs phosphorylate include condensin proteins, which are essential ... which form a stabilizing network under the nuclear membrane that assembles during mitosis.
Description : What are heterotrimeric G proteins?
Last Answer : G proteins with three different subunits, designated as alpha, beta, and gamma. Alpha and gamma subunits attach to the plasma membranes via lipid anchors. In the absence of a signal, the entire GDP ... alpha subunit is replaced by GTP, and the GTP-bound alpha subunit and beta-gamma dimer dissociate.
Description : What are G proteins?
Last Answer : G proteins are proteins that can bind guanosine triphosphate (GTP) and guanosine diphosphate (GDP). G-proteins function as switches; GTP-bound G-proteins are active whereas GDP-bound G-proteins are inactive.
Description : True or False: The vast majority of mitochondrial proteins are synthesized from genetic information encoded in the mitochondrial genome.
Last Answer : False. Most mitochondrial proteins are synthesized from nuclear genes and then transported into the mitochondria through the presence of a signal sequence.
Description : Describe how proteins that are synthesized in the endoplasmic reticulum (ER) are transported to their final destination.
Last Answer : Proteins that are synthesized in the ER have a signal sequence that directs them to their target destination. Soluble proteins are carried inside the lumen of vesicles. Cargo-bearing vesicles ... lysosomes or plasma membrane. Vesicles that have released their cargo return via the reverse direction.
Description : Name the type of proteins that work to catalyze metabolic reactions or can modify other proteins to switch their activity on or off.
Last Answer : Enzymes
Description : What is the function of proteins like microtubules and actin filaments?
Last Answer : Give structure to cells.
Description : Typically proteins do not work in their simple amino acid chain structure but instead fold and form shapes that help in their function. Which of the structures is described as being in alpha helices and beta sheets?
Last Answer : Secondary Protein Structure
Description : What types of proteins are involved in the packaging and condensing of DNA into tightly wound nucleosome structures of a chromosome?
Last Answer : Histone
Description : Metabolism is carried out by a large class of proteins that decrease the activation energy required for chemical reactions inside a cell. Therefore they only facilitate reactions that would naturally occur at a much slower rate. What is the name of these proteins that speed up biochemical reactions?
Description : A cell that is missing lysosomes would have difficulty doing what? (A) Digesting food (B) Storing energy (C) Packaging proteins (D) Moving cytoplasm
Last Answer : (A) Digesting food
Description : What is the molecule responsible for the absorption of photic energy for photosynthesis ?
Last Answer : Where is that molecule located in photosynthetic cells? The chlorophyll molecules are the responsible for the absorption of the light energy for photosynthesis. These molecules are found on the internal membranes of chloroplasts.
Description : List three common second messengers and the enzyme responsible for their production:
Last Answer : - cAMP - synthesized from ATP by adenylate cyclase - diacylglycerol (DAG) and inositol 1,4,5-triphosphate (IP3)- produced by the phospholipase C - Ca2+ - released from intracellular stores (the second messenger IP3 is a common trigger for Ca2+ release).
Description : Cytoskeletal elements are responsible for giving cells their shape and provide a basis for cell movement, migration, and cell division. Name the three major classes of cytoskeletal elements in eukaryotic cells.
Last Answer : Microtubules (composed of tubulin); actin filaments (made up of actin); intermediate filaments
Description : In the digestive system, proteins are broken down into: a) simple sugars. b) fatty acids. c) amino acids. d) glycerol.
Last Answer : ANSWER: C -- AMINO ACIDS.
Description : What about some bacteria is important to important to humans in terms of our being able to make proteins and nucleic acids from the foods we eat?
Last Answer : Feel Free to Answer
Description : Nucleic acids can be detected by means of their absorption maxima near 260 nm. Their absorption in this range is due to (A) Proteins (B) Purines and pyrimidines (C) Ribose (D) Deoxyribose
Last Answer : Answer : B
Description : Maximum energy produced by (A) Fats (B) Carbohydrates (C) Proteins (D) Nucleic acids
Last Answer : Answer : A
Description : For biosynthesis of proteins (A) Amino acids only are required (B) Amino acids and nucleic acids only are required (C) Amino acid, nucleic acids and ATP only are required (D) Amino acids, nucleic acids, ATP, GTP, enzymes and activators are required
Last Answer : Answer : D