Description : ________________ increases size of an object. (A) Magnification (B) Resolution (C) Resolving power (D) Contrast
Last Answer : (A) Magnification
Description : Resolving power is the ability of a microscope to a. Estimate cell size. b. Magnify an image. c. See two close objects as separate. d. Keep objects in focus.
Last Answer : d. Keep objects in focus.
Description : What is the power of the objective lens of a microscope if an eyepiece of power 10x is used and the total magnification of the object is 40x? (A) 4 (B) 10 (C) 40 (D) 400
Last Answer : (A) 4
Description : If a microscope's ocular is marked 10x and the low power objective is marked 2xwhat would be the total magnification when using the low power objective?
Last Answer : What is the answer ?
Description : The ratio of the distances at which a stated length can be distinguished by the telescope and the human eye, respectively, is called (A) Brightness of telescope (B) Magnification of telescope (C) Resolving power of telescope (D) None of these
Last Answer : (C) Resolving power of telescope
Description : The ratio of the angles subtended at the eye, by the virtual image and the object, is known as telescopes (A) Resolving power (B) Brightness (C) Field of view (D) Magnification
Last Answer : (D) Magnification
Description : Explain the difference between the angular magnification and resolving power of optical instrument. What limits the magnification of an optical instrument?
Last Answer : Angular magnification: The ratio of the angle subtended by the image as seen through the optical device to that subtended by the object at the un-aided eye Resolving Power: It is the ... object under examination. The magnification of an optical instrument is limited due to defects in lenses.
Description : The following are true about critical fusion frequency: a. it refers to the rate at which stimuli can be presented and still be perceived as separate stimuli b. it is dependent on visual ... on the spacing between neighbouring photoreceptors d. it depends on the time-resolving ability of the eye
Last Answer : it depends on the time-resolving ability of the eye
Description : What term is used to describe the ability of a radar system to distinguish between targets that are close together?
Last Answer : Target resolution
Description : Which of the following scientific instruments has the greatest resolving power? w) electron microscope x) light microscope y) phase-contrast microscope z) centrifuge
Last Answer : ANSWER: W -- ELECTRON MICROSCOPE
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 : 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 : The eukaryotic cell cycle consists of discrete phases. One of these is named the M or mitosis phase during which the cell divides. Following the M phase is a period known as interphase that is made up of three distinct phases. Name, in order, the three separate phases of interphase.
Last Answer : G1, S and G2
Description : A chromosome with the centromere located very close to one end so that the shorter arm is very small is termed as (A) Telocentric (B) Sub-telocentric (C) Acrocentric (D) Both B and C
Last Answer : (D) Both B and C
Description : Adjacent plant cells are “cemented” together by (A) Their primary walls (B) Their secondary walls (C) A middle lamella (D) Plasmodesmata
Last Answer : (C) A middle lamella
Description : What is the ability to distinguish two nearby objects called?
Last Answer : Resolving power.
Description : If you wanted to study the surface of a bacterial cell, you would use a. A transmission electron microscope. b. A light microscope with phase-contrast optics. c. A scanning electron microscope. d. A light microscope with dark-field optics.
Last Answer : c. A scanning electron microscope.
Description : If you wanted to study bacterial motility you would most likely use a. A transmission electron microscope. b. A tight microscope with dark-field optics. c. A scanning electron microscope. d. A light microscope with phase-contrast optics.
Last Answer : a. A transmission electron microscope.
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 : The site of enzymes directing the metabolic oxidation (respiration), ATP synthesis and considered as power house of cell are (A) Lysosomes (B) Microsomes (C) Mitochondria (D) Golgi apparatus
Last Answer : (C) Mitochondria
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
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 : How do the amoeboid movements occur ?
Last Answer : What are examples of beings and cells that use such movements for locomotion? Amoeboid movements are created by cytoplasmic movements and plasma membrane projections called pseudopods. Their formation ... in the inflammatory process. Cytoskeleton and Cell Movement - Image Diversity: pseudopods
Description : What are cilia and flagella ?
Last Answer : How do these structures acquire movement? What are some examples of ciliated and flagellated cells in humans? Cilia and flagella are structures found in some prokaryotes as well in some eukaryotic ... the ovule. Cytoskeleton and Cell Movement - Image Diversity: ciliated cell flagellate cell
Description : What are cell movements ?
Last Answer : How are these movements created? Cell movements are movements performed by cell structures, like the movements of cilia and flagella, the pseudopod movements (in amoeba, macrophages, etc. ... action, by differences of viscosity among cytoplasmic regions and by intracellular contraction systems.
Description : which substance are microtubules made ?
Last Answer : In which structures and cellular processes do microtubules participate? Microtubules are made of consecutive dimers of the protein tubulin (each dimer has an alpha and a beta tubulin associated) ... also form the centrioles. Cytoskeleton and Cell Movement - Image Diversity: microtubules tubulin
Description : What is cytoskeleton ?
Last Answer : What are its main constituents in animal cells? Cytoskeleton is the cytoplasmic structure that supports the cell, keeps its shape and fixates and moves the cell organelles. It is made of an ... intermediate filaments. Cell Skeleton and Cell Movement - Image Diversity: the "cell skeleton"
Description : Why are salt and sugar used in the production of dried meat and dried fruits ?
Last Answer : Substances that maintain highly hypertonic environment, like sugar and salt, are used in the production of dried meat, fish or fruits (for example, cod) because the material to be conserved is then ... the growth of populations of decomposer beings (since these beings also lose water and die).