Description : Microtubules consist of helically stacked molecules of the protein (A) Actin (B) Myosin (C) Keratin (D) Tubulin
Last Answer : (D) Tubulin
Description : The protein from which hook and filaments of flagella are composed of, is A- keratin B- flagellin C- gelatin D- casein
Last Answer : flagellin
Description : Endoskeleton of a cell is made up of (A) Microtubules (B) Microfilaments (C) Intermediate filaments (D) All of these
Last Answer : (D) All of these
Description : RNA is composed of strands of nucleotides that are read as a 3 nucleotide codon. These are distinguished by tRNAs that match the codons on one end and carry individual building blocks of a protein chain. What are these building blocks of protein that tRNAs bind?
Last Answer : Amino Acids
Description : A protein rich in cysteine is (A) Collagen (B) Keratin (C) Haemoglobin (D) Gelatin
Last Answer : Answer : B
Description : What is the function of proteins like microtubules and actin filaments?
Last Answer : Give structure to cells.
Description : The protein present in the finger nail is (1) Actin (2) Myosin (3) Globin (4) Keratin
Last Answer : (4) Keratin Explanation: Keratin is a fibrous protein making up most cells found in our nails and hair and the epidermis layer of our skin. It also makes up fish scales and crustacean shells, bird feathers and beaks, and animal horns and hooves.
Last Answer : Keratin
Description : Mitotic spindle is mainly composed of which protein? (a) Actin (b) Myosin (c) Actomyosin (d) Myoglobin
Last Answer : c) Actomyosin
Description : Which of the following statements regarding cilia is not correct ? (a) Cilia contain an outer ring of nine doublet microtubules surrounding two singlet microtubules. (b) The organised beating of ... (c) Cilia are hair-like cellular appendages. (d) Microtubules of cilia are composed of tubulin
Last Answer : (b) The organised beating of cilia is controlled by fluxes of Ca2+ across the membrane.
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 : Briefly, describe how GPCR and heterotrimeric G protein-mediated signaling occurs.
Last Answer : Binding of a signaling molecule (ligand) to GPCRs causes a conformation change in GPCR, leading to heterotrimeric G protein activation, where GTP physically replaces the GDP bound to the alpha ... some G proteins stimulate the activity of target proteins, whereas others G proteins are inhibitory.
Description : RNA molecules can be broken up into three classes-which type of RNA molecule is translated into a protein sequence?
Last Answer : Messenger RNA (mRNA). mRNAs are the RNA transcripts that contain protein coding sequences which are translated into protein.
Description : In a eukaryotic cell, what separates DNA from the protein translation machinery in the cytoplasm?
Last Answer : The nuclear envelope.
Description : The three-dimensional network of protein filaments within the cytoplasm of eukaryotic cells is called the (A) Endoplasmic reticulum (B) Golgi apparatus (C) Cytoskeleton (D) None of these
Last Answer : (C) Cytoskeleton
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 : It is a mesh of interconnected membranes that serve a function involving protein synthesis and transport. (A) Endoplasmic reticulum B) Cytoskeleton (C) Golgi apparatus (D) Both A and B
Last Answer : (A) Endoplasmic reticulum
Description : The door to your house is like the __________________ of a cell membrane? (A) Phospholipid bilayer (B) Integral protein (C) Recognition protein (D) Peripheral protein
Last Answer : (B) Integral protein
Description : SER is abundant in cells that are involved in (A) Lipid metabolism (B) Protein metabolism (C) Glucose metabolism (D) Calcium metabolism
Last Answer : (A) Lipid metabolism
Description : $ Endoplasmic reticulum also acts as the cell-skelton. ! Flagellum of a prokaryotic cell is formed of a protein called Tubulin.
Last Answer : $ Endoplasmic reticulum also acts as the cell-skelton. ! Flagellum of a prokaryotic cell is formed of a ... wrong D. If both As and R are wrong.
Description : Benzimidazoles work against parasites by A A. Binding with protein tubulin B. Mimicking acetylcholine C. Both D. None of above
Last Answer : Binding with protein tubuli
Description : Which of the following is the contractile protein of a muscle? (a) Tropomyosin (b) Tubulin (c) Myosin (d) All of these
Last Answer : (c) Myosin
Description : Chemical score of protein gelatin is (A) 0 (B) 44 (C) 57 (D) 60
Last Answer : Answer : A
Description : A protein having both structural and enzymatic traits is (A) Myosin (B) Collagen (C) Trypsin (D) Actin
Description : Genes are packaged into a bacterial chromosome by (a) acidic protein (b) actin (c) histones (d) basic protein.
Last Answer : basic protein
Description : Macrophages are professional antigen- presenting cells. The protein molecule through which theypresent antigen in human is A.actin B.interleukin C.HLA D.CD8
Last Answer : D.CD8
Description : Macrophages are professional antigen- presenting cells. The protein molecule through whichthey present antigen in human is A- actin B- nterleukin C- HLA D- .CD8
Last Answer : .CD8
Description : Can two normal individuals of the same species with sexual reproduction have identical genomes and identical karyotypes ? How the human karyotype is usually represented?
Last Answer : Except for clones (individuals created from nucleus transplantation, like the Dolly sheep) and monozygotic twins, it is very improbable the genomes of two individuals of the same species and generated by sexual ... normal karyotype is represented by the formula 44+XX for women and 44+XY for men.
Description : What is the difference between the concepts of karyotype and genome ?
Last Answer : Genome is the set of DNA molecules that characterizes each living being or each species. The concept then includes the specific nucleotide sequence of the DNA molecules of each individual or species. ... of each chromosome or pair of homologous. Cell Nucleus Review - Image Diversity: karyotype
Description : What are homologous chromosomes ?
Last Answer : Which are the human cells that do not have homologous chromosomes? Chromosomes contain genes (genetic information in the form of nucleotide sequences) that command the protein synthesis thus ... chromosomes are the gametes since during meiosis the homologous chromosomes are separated.
Description : What are the primary and the secondary constrictions of a chromosome ?
Last Answer : What is the other name given to the secondary constriction? Primary constriction is the narrower region of a condensed chromosome where the centromere, the structure that unites identical chromatids, is located. ... can be one or more in chromosome) is called nucleolus organizer region (NOR).
Description : How the chromosome region where the centromere is located is called ?
Last Answer : How are chromosomes classified in relation to the position of their centromere? The chromosome region where the centromere is located is called primary constriction. In microscopic view ... constriction the chromosomes are classified as telocentric, acrocentric, submetacentric or metacentric.
Description : What is the structure that maintains identical chromatids bound ?
Last Answer : The structure that maintains identical chromatids bound is the centromere. Cell Nucleus Review - Image Diversity: centromere
Description : How are the concepts of chromosome ?
Last Answer : chromatin and chromatids related? In which phase of the cell cycle does DNA duplicate? Chromatin is a set of filamentous DNA molecules dispersed in the karyoplasm forming euchromatin and heterochromatin ... chromosomes (and not only one). Cell Nucleus Review - Image Diversity: chromatids
Description : In the phase when the cell is not dividing ?
Last Answer : interphase) is there activity within the cell nucleus? In the interphase there is intense metabolic activity in the cell nucleus: DNA is duplicating, euchromatin is being transcript and RNA is produced.
Description : What is the relation between the concepts of chromatin and chromosome ?
Last Answer : Are euchromatin and heterochromatin part of chromosomes? Every filament of chromatin is a complete DNA molecule (a complete double helix), i.e., a complete chromosome. A DNA molecule may form ... thus both are part of chromosomes. Cell Nucleus Review - Image Diversity: chromosome structure
Description : What are heterochromatin and euchromatin ?
Last Answer : Chromatin is uncondensed nuclear DNA, the typical DNA morphology in interphase (the phase of the cell cycle in which the cells is not dividing itself). In this phase of the cell cycle ... inactive portions of the DNA molecule. Cell Nucleus Review - Image Diversity: heterochromatin euchromatin
Description : Do all eukaryotic cells have nucleus and only one nucleus ?
Last Answer : There are eukaryotic cells without nucleus and others with more than one nucleus. Osteoclasts, the cells responsible for resorption of the osseous matrix, for example, are multinucleate cells; ... cells. Cell Nucleus Review - Image Diversity: cell nucleus miltinucleate cells enucleated cells
Description : How are cells with delimited nucleus called ?
Last Answer : What are the main elements of the nucleus? Cells with delimited nucleus are called eukaryotic cells. Organisms composed of one or more eukaryotic cells are called eukaryotes. The mains elements of the ... the nucleolus, the karyolymph, or nucleoplasm, and the nuclear membrane (or karyotheca).
Description : What are some biological examples in which lysosomic enzymes play fundamental role ?
Last Answer : The remodelation of the osseous tissue, the function of acrosomes in sperm cells and the elimination of the tadpole tail are examples of biological processes in which lysosomic enzymes are key factors. The ... cell by its own mechanisms is called autolysis, a type of apoptosis (celll suicide).
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 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 : 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 : What are some examples of secretory cells ?
Last Answer : Endocrine and exocrine pancreatic cells, thyroid and parathyroid endocrine cells, adenohypophysis, adrenal and pineal endocrine cells, the many types of gastric exocrine and endocrine cells, the mucous secretory cells ... of the ovaries and testicles, etc., are all examples of secretory cells.
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 : Which cell organelles are well-developed in secretory cells ?
Last Answer : In secretory cells, like the secretory cells of endocrine glands, organelles related to production, processing and exportation of substances are widely present and well-developed. These ... protein synthesis between the cytoplasm and the nucleus. Rough endoplasmic reticulum Golgi apparatus
Description : What is meant by cellular secretion ?
Last Answer : Cell secretion is the elimination to the exterior of substances produced by the cell (for example, hormones, mucous, sweat, etc.)
Description : What is cyclosis ?
Last Answer : Cyclosis is a type of internal cell movement in which an oriented flow of circulating material is created and maintained in the cytoplasm by the action of microfilaments. Cyclosis is more easily observed in plant cells. Cytoskeleton and Cell Movement - Image Diversity: cyclosis