What are some examples of secretory cells ?

What are some examples of secretory cells ?
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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 lungs and of the bowels, the salivary gland cells, the lacrimal gland cells, the sebaceous gland cells, the secretory cells of the ovaries and testicles, etc., are all examples of secretory cells.    
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Which cell organelles are well-developed in 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

If a gene mutation prevents formation of an enzyme normally used by a lysosomes, a disease may result known as (A) Lysosomal abstracted disease (B) Lysosomal secretory disease (C) Lysosomal storage disease (D) All A, B and C

Description : If a gene mutation prevents formation of an enzyme normally used by a lysosomes, a disease may result known as (A) Lysosomal abstracted disease (B) Lysosomal secretory disease (C) Lysosomal storage disease (D) All A, B and C

Last Answer : (C) Lysosomal storage disease

What are some examples of movement created by the contraction of sarcomeres of the muscle cells ?

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.

What are some biological examples in which lysosomic enzymes play fundamental role ?

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).

What are some examples of biological activities in which osmosis plays important role ?

Description : What are some examples of biological activities in which osmosis plays important role ?

Last Answer : Hemolysis (destruction of red blood cells) by entrance of water, the hydric regulation in plants and the entrance of water in the xylem of vascular plants are all examples of biological phenomena caused by ... of water in plant roots since root cells are hypertonic in comparison to the soil.

Which are the cell organelles that participate in the cell division and in the formation of cillia and flagella of some eukaryotic cells ?

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

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.

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

Do all eukaryotic cells have nucleus and only one nucleus ?

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

How are cells with delimited nucleus called ?

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).

What is deplasmolysis of plant cells ?

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.

What are the values of DPD for plant cells under hypertonic ?

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 =

What is the wall resistance of plant cells ?

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.

Why can mitochondria be considered the power plants of the aerobic cells ?

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.

What are the main cytoplasmic structures present in animal cells ?

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

Concerning the presence of nucleus what is the difference between animal and bacterial cells ?

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.

Do membranes form only the outer wrapping of cells ?

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

Do bacteria cells have 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.

What are the two big groups into which cells are classified ?

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

Are plasma membranes the outer boundaries of all cells?

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. 

Will growth factors can stimulate cells to divide?

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. 

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 proliferation? For example, many cancer cells carry two mutant copies of the gene that codes for a tumor suppressor protein named p53. What is the normal function of p53 that is lost when it is mutated?

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.

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, stem cells serve as a reservoir of undifferentiated cells that have the capacity to mature into different cell types. What is the name of the process that stem cells undergo when they are required to generate a particular type of cell?

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.

What is the name of the physical process that finally splits the parent cell into two identical daughter cells?

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

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.

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.

What common cell types are regulated by ion channels and are commonly referred to as excitable cells?

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

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 membrane, nuclear envelope, endoplasmic reticulum, the Golgi apparatus, and lysosomes. Name a cellular component whose membrane is not part of the endomembrane system.

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

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.

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

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 of that specific metabolite at an earlier point in the pathway to prevent a buildup of that specific product. What is this process called?

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

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

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

Insulin is secreted from cells in this way (A) Endocytosis (B) Pinocytosis (C) Phagocytosis (D) Exocytosis

Description : Insulin is secreted from cells in this way (A) Endocytosis (B) Pinocytosis (C) Phagocytosis (D) Exocytosis

Last Answer : (D) Exocytosis

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

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

Somatic cells of a human have ____ chromosomes and are called (A) 10, haploid (B) 92, diploid (C) 23, haploid (D) 46, diploid

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

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

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

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 /

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

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

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

Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of (A) Diffusion (B) Passive transport (C) Osmosis (D) Active transport

Description : Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of (A) Diffusion (B) Passive transport (C) Osmosis (D) Active transport

Last Answer : (D) Active transport

Adjacent plant cells are “cemented” together by (A) Their primary walls (B) Their secondary walls (C) A middle lamella (D) Plasmodesmata

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

SER is abundant in cells that are involved in (A) Lipid metabolism (B) Protein metabolism (C) Glucose metabolism (D) Calcium metabolism

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

Biochemically the ribosome consists of _______________ and some 50 structural . (A) mRNA, Carbohydrates (B) tRNA, lipids (C) mRNA, Proteins (D) rRNA, Proteins

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

Can two normal individuals of the same species with sexual reproduction have identical genomes and identical karyotypes ? How the human karyotype is usually represented?

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.

What is the difference between the concepts of karyotype and genome ?

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

What are homologous chromosomes ?

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.

What are the primary and the secondary constrictions of a chromosome ?

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).

How the chromosome region where the centromere is located is called ?

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.

What is the structure that maintains identical chromatids bound ?

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

How are the concepts of chromosome ?

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

In the phase when the cell is not dividing ?

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.

What is the relation between the concepts of chromatin and chromosome ?

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

What are heterochromatin and euchromatin ?

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

What is autophagic intracellular digestion ?

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.