Description : The outer most layer of cell wall is (A) Primary wall (B) Secondary wall (C) Middle lamella (D) Plasma membrane
Last Answer : (C) Middle lamella
Description : Plasmodesmata are (a) locomotory structures (b) membranes connecting the nucleus with plasmalemma (c) connections between adjacent cells (d) lignified cemented layers between cells.
Last Answer : (c) connections between adjacent cells
Description : Dye injected into a plant cell might be able to enter an adjacent cell through a (A) Tight junction (B) Microtubule (C) Desmosome (D) Plasmodesma
Last Answer : (D) Plasmodesma
Description : Which one of the following structures between two adjacent cells is an effective transport pathway? (a) Plasmodesmata (b) Plastoquinones (c) Endoplasmic reticulum (d) Plasmalemma
Last Answer : (a) Plasmodesmata
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 : What are the main respective constituents of cell walls in bacteria ?
Last Answer : protists, fungi and plants? In bacteria cell wall is made of peptidoglycans; among protists algae have cell wall made of cellulose; in fungi, the cell wall is made of chitin (the same substance that makes the exoskeleton of arthropods); in plants, the cell wall is made of cellulose too.
Description : What is the importance of Calcium Pectate in the middle lamella of a plant cell? -Biology
Last Answer : answer:
Description : What is deplasmolysis of plant cells ?
Last Answer : The plant cell when placed under hypertonic medium loses a great amount of water and its cell membrane detaches from the cell wall. In that situation the cell is called plasmolysed cell. When ... medium it absorbs water and becomes a turgid cell. This phenomenon is called deplasmolysis.
Description : What are the values of DPD for plant cells under hypertonic ?
Last Answer : isotonic and hypotonic media? In plant cells under hypertonic medium there is loss of water for the exterior, SF > 0 (the vacuolar pressure is high because it is concentrated) and TP = 0 (there ... (since the osmotic pressure is totally compensated by the distension of the cell wall) and DPD =
Description : What is the wall resistance of plant cells ?
Last Answer : Does this resistance facilitate or make it difficult the entrance of water in the cell? Wall resistance, or turgor pressure (TP), is the pressure made by the distension of the plant cell wall in ... it acts forcing the exiting of water and compensating the entrance of the solvent by osmosis.
Description : Which of the following organelles or structures is found in both plant and animal cells? (A) Central vacuole (B) Tonoplast (C) Cell wall (D) Peroxisomes
Last Answer : (D) Peroxisomes
Description : Plant cells contain the following 3 things not found in animal cells _________, _____________ and ______________. (A) Plastids / Chlorophyll / Membrane (B) Chloroplast / Cell wall / Golgi body (C) Plastids / Cell wall / Chlorophyll (D) Mitochondria / Cell wall /
Last Answer : (C) Plastids / Cell wall / Chlorophyll
Description : Cells are commonly studied in the lab. If you were examining various unlabelled slides of cells under the microscope, you could tell if the cell was from a plant by the presence of (A) A nucleus (B) A cell membrane (C) Cytoplasm (D) A cell wall
Last Answer : (D) A cell wall
Description : What is a microscope's ability to distinguish between separate objects that are close together? (A) Magnification (B) Contrast (C) Resolving power (D) Scanning power
Last Answer : (C) Resolving power
Description : RNA transcription is more complex in eukaryotes because it is first made as a primary RNA transcript that contains intron and exon sequences. What kind of modification must occur to produce a mature mRNA?
Last Answer : RNA splicing. Introns must be removed and exons are spliced together to form a mature RNA transcript.
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 : What is middle lamella of cell wall? -Biology
Description : What is the function of the middle lamella? -Biology
Description : What is middle lamella? -Biology
Description : Middle lamella is composed mainly of :
Last Answer : Middle lamella is composed mainly of : A. Phosphoglycerides B. Hemicellulose C. Muramic acid D. Calcium pectate
Description : Element necessary for the middle lamella is (a) Ca (b) Zn (c) K (d) Cu.
Last Answer : (a) Ca
Description : Middle lamella is composed mainly of (a) muramic acid (b) calcium pectate (c) phosphoglycerides (d) hemicellulose.
Last Answer : (b) calcium pectate
Description : Importance of plasmodesmata to living plant cells? -Biology
Description : Plasmodesmata in plant cells -Biology
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 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 : 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 are some examples of movement created by the contraction of sarcomeres of the muscle cells ?
Last Answer : The handling of a cup of coffee, the peristaltic movements of the bowels, the cardiac beats and even a smile are examples of movement created by contraction of the sarcomeres of the muscle cells. This contraction is a type of cell movement.
Description : Why can mitochondria be considered the power plants of the aerobic cells ?
Last Answer : Mitochondria are the power plants of aerobic cells because within them the final stages of the cellular respiration process occurs. Cellular respiration is the process of using organic molecule (mainly ... of the cellular respiration take place: the Krebs cycle and the respiratory chain.
Description : Which are the cell organelles that participate in the cell division and in the formation of cillia and flagella of some eukaryotic cells ?
Last Answer : The organelles that participate in the cell division and in the formation of cilia and flagella of some eukaryotic cells are the centrioles. Some cells have cillia (paramecium, the bronchial ciliated ... are very important for cell division. Cell Structure Review - Image Diversity: centrioles
Description : What are the main cytoplasmic structures present in animal cells ?
Last Answer : The main cytoplasmic structures of the cell are the centrioles, the cytoskeleton, lysosomes, mitochondria, peroxisomes, the Golgi apparatus, the endoplasmic reticula and ribosomes. Cell Structure Review - Image Diversity: cell organelles
Description : Concerning the presence of nucleus what is the difference between animal and bacterial cells ?
Last Answer : Animal cells (cells of living beings of the kingdom Animalia) have an interior membrane that delimits a cell nucleus and thus they are eukaryotic cells; in these cells the genetic material is located ... so they are prokaryotic cells and their genetic material is found dispersed in the cytosol.
Description : Do membranes form only the outer wrapping of cells ?
Last Answer : Lipid membranes do not form only the outer cover of cells. Cell organelles, such as the Golgi complex, mitochondria, chloroplasts, lysosomes, the endoplasmic reticula and the nucleus, are delimited by membranes too. Cell Structure Review - Image Diversity: cell nucleus
Description : Do bacteria cells have nucleus ?
Last Answer : In bacteria the genetic material is dispersed in the cytosol and there is no internal membrane that delimits a nucleus.
Description : What are the two big groups into which cells are classified ?
Last Answer : Cells can be classified as eukaryotic or prokaryotic. Prokaryotic cell is that without a delimited nucleus. Eukaryotic cells are those with nucleus delimited by membrane. Cell Structure Review - Image Diversity: eukaryotic cell prokaryotic cell
Description : Are plasma membranes the outer boundaries of all cells?
Last Answer : No, in many cells the plasma membrane is encased within an extraneous coat of nonliving material that usually confers some rigidity on the cell it surrounds. Although not affecting permeability, this ... of this structure is not completely clear. In Euglena, it consists of flexible protein strips.
Description : Will growth factors can stimulate cells to divide?
Last Answer : Cyclin-Cdk complexes provide internal control for cell cycle decisions. Cells in multicellular organisms must divide only when appropriate. They must respond to external signals, controls called growth factors. ... either make their own growth factors Or no longer require them to start cycling.
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 : Tissues are constructed from many distinct cell types that perform different functions in response to signals from each other and the extracellular matrix. During tissue development and tissue regeneration, ... that stem cells undergo when they are required to generate a particular type of cell?
Last Answer : Asymmetric cell division. After asymmetric division, each of the two resulting daughter cells has a unique life course. For example, one daughter cell may differentiate into a specific cell type ( ... cell), whereas the other daughter cell may remain a stem cell with unlimited proliferative ability.
Description : What is the name of the physical process that finally splits the parent cell into two identical daughter cells?
Last Answer : Cytokinesis. Also more commonly known as cell division
Description : During mitosis, the eukaryotic cell nucleus splits in two, followed by division of the parent cell into two daughter cells. Mitosis progresses through five separate morphologically distinct phases. Name, in order, these five phases of mitosis.
Last Answer : Prophase, prometaphase, metaphase, anaphase, and telophase.
Description : What common cell types are regulated by ion channels and are commonly referred to as excitable cells?
Last Answer : neurons, muscle cells, sensory receptor cells
Description : Eukaryotic cells have extensive intracellular membranes, termed the endomembrane system, which divide the cell into structurally and functionally distinct compartments, or organelles. These include the inner cell ... . Name a cellular component whose membrane is not part of the endomembrane system.
Last Answer : Mitochondria; also chloroplasts
Description : Cells must constantly manage metabolic pathways, and this is often done by balancing specific biochemical reactions within a pathway. For example, the metabolic product of one pathway may block the formation ... the pathway to prevent a buildup of that specific product. What is this process called?
Last Answer : Feedback inhibition
Description : Instead of using energy from oxidative reactions immediately, cells store some of this energy for later use. Name two of these small, energy-rich molecules used to store energy.
Last Answer : ATP and NADH
Description : Insulin is secreted from cells in this way (A) Endocytosis (B) Pinocytosis (C) Phagocytosis (D) Exocytosis
Last Answer : (D) Exocytosis
Description : An animal has 80 chromosomes in its gametes, how many chromosomes would you expect to find in this animal's brain cells? (A) 120 (B) 240 (C) 40 (D) 160
Last Answer : (D) 160
Description : Somatic cells of a human have ____ chromosomes and are called (A) 10, haploid (B) 92, diploid (C) 23, haploid (D) 46, diploid
Last Answer : (D) 46, diploid
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