UNIT: Diversity of Life AZ State Standards – Strand 4 Life Science
... A. Living things have definite characteristics that distinguish them from nonliving things. B. The structures present in living things are related to the functions performed by those structures. C. The cell is the basic unit of life. D. Living things need appropriate environments to survive. E. Livi ...
... A. Living things have definite characteristics that distinguish them from nonliving things. B. The structures present in living things are related to the functions performed by those structures. C. The cell is the basic unit of life. D. Living things need appropriate environments to survive. E. Livi ...
Tonicity, which is directly related to the osmolarity of a
... solute particles; a solution with high osmolarity has fewer water molecules with respect to solute particles. In a situation in which solutions of two different osmolarities are separated by a membranepermeable to water, though not to the solute, water will move from the side of the membrane with lo ...
... solute particles; a solution with high osmolarity has fewer water molecules with respect to solute particles. In a situation in which solutions of two different osmolarities are separated by a membranepermeable to water, though not to the solute, water will move from the side of the membrane with lo ...
CELL: THE UNIT OF LIFE
... of nucleoprotein fibers called chromatin (coined by Flemming). During cell division the chromatin condenses to form distinctly visible chromosomes. Discovery: The term chromosome (chroma – colour, soma – body) was coined by Waldeyer (1888), Discovered by Holf Meister (1848) observed in pollen mother ...
... of nucleoprotein fibers called chromatin (coined by Flemming). During cell division the chromatin condenses to form distinctly visible chromosomes. Discovery: The term chromosome (chroma – colour, soma – body) was coined by Waldeyer (1888), Discovered by Holf Meister (1848) observed in pollen mother ...
Cycloprodigiosin Hydrochloride Inhibits Acidification of the Plant
... Chara corallina and Nitella furcata were cultured in an airconditioned room (about 25 °C) as reported previously (Mimura and Shimmen 1994). Internodal cells were isolated from neighboring cells and stored before use in artificial pond water (APW) containing 0.1 mM each of CaCl2, KC1 and NaCl. Analys ...
... Chara corallina and Nitella furcata were cultured in an airconditioned room (about 25 °C) as reported previously (Mimura and Shimmen 1994). Internodal cells were isolated from neighboring cells and stored before use in artificial pond water (APW) containing 0.1 mM each of CaCl2, KC1 and NaCl. Analys ...
CLASSIFICATION
... Aristotle began a simple _____________________________ system by grouping organisms into ____ main groups: ________________________ and ___________________________. These groups were called kingdoms. Can you think of any problems with this classification system? ________________________ ____________ ...
... Aristotle began a simple _____________________________ system by grouping organisms into ____ main groups: ________________________ and ___________________________. These groups were called kingdoms. Can you think of any problems with this classification system? ________________________ ____________ ...
5.4 Asexual Reproduction Binary fission is similar in function to
... – Binary fission produces two daughter cells genetically identical to the parent cell. parent cell – Binary fission occurs in prokaryotes. DNA duplicates ...
... – Binary fission produces two daughter cells genetically identical to the parent cell. parent cell – Binary fission occurs in prokaryotes. DNA duplicates ...
Cell Membrane and Transport
... b. Outline the roles of cell surface membranes; Passive transport through cell membranes Molecules and ions are in constant motion. In gases and liquides they move freely. As a result of their random motion, each type of molecule or ion tends to spread out evenly within thespace available. This is d ...
... b. Outline the roles of cell surface membranes; Passive transport through cell membranes Molecules and ions are in constant motion. In gases and liquides they move freely. As a result of their random motion, each type of molecule or ion tends to spread out evenly within thespace available. This is d ...
Gene Section DDIT4 (DNA-damage-inducible transcript 4) Atlas of Genetics and Cytogenetics
... - Sp1: REDD1 levels are increased in high cell densities in a Sp-1 dependent manner (Jin et al., 2007). Sp1 siRNA in HeLa cells abolished REDD1 induction by high cell density. Sp1 can also contribute to REDD1 induction in hypoxia or in response to hypoxia mymetics (Jin et al., 2007), and siRNA exper ...
... - Sp1: REDD1 levels are increased in high cell densities in a Sp-1 dependent manner (Jin et al., 2007). Sp1 siRNA in HeLa cells abolished REDD1 induction by high cell density. Sp1 can also contribute to REDD1 induction in hypoxia or in response to hypoxia mymetics (Jin et al., 2007), and siRNA exper ...
free medium for progeny cell division - Journal of Cell Science
... had terminated, 10 % serum was added back and the cells were maintained for up to 48 h without change in medium. The intermitotic time was plotted against cell age at the time of onset of serum starvation. It is shown that a 1-h exposure to serum-free medium leads to a delay of the cycle times in ab ...
... had terminated, 10 % serum was added back and the cells were maintained for up to 48 h without change in medium. The intermitotic time was plotted against cell age at the time of onset of serum starvation. It is shown that a 1-h exposure to serum-free medium leads to a delay of the cycle times in ab ...
Transport in Plants IV Water Balance of Plants cont. Phloem
... – the most typical deficiency characteristic is chlorosis (yellow leaves), • slowly developing deficiencies produce short, woody stemmed plants, • anthocyanin production (red pigment). ...
... – the most typical deficiency characteristic is chlorosis (yellow leaves), • slowly developing deficiencies produce short, woody stemmed plants, • anthocyanin production (red pigment). ...
Questions - National Biology Competition
... Protozoans take up water by endocytosis; therefore, they must expel it by exocytosis. ...
... Protozoans take up water by endocytosis; therefore, they must expel it by exocytosis. ...
Acid-Fast Stain
... (mycolic acids) in their cell walls. These cells are impervious to methylene blue and other basic dyes. The carbolfuchsin dye penetrates the cell wall and stains the bacteria. You must either heat the slides to melt the mycolic acids or add a detergent to the dye so that it will penetrate the cell w ...
... (mycolic acids) in their cell walls. These cells are impervious to methylene blue and other basic dyes. The carbolfuchsin dye penetrates the cell wall and stains the bacteria. You must either heat the slides to melt the mycolic acids or add a detergent to the dye so that it will penetrate the cell w ...
3.2 Cell Organelles Cells have an internal structure.
... • Mitochondria supply energy to the cell. • Vacuoles are fluid-filled sacs that hold materials. • Lysosomes contain enzymes to digest material. • Centrioles are tubes found in the centrosomes. – Centrioles help divide DNA. – Centrioles form cilia and flagella. ...
... • Mitochondria supply energy to the cell. • Vacuoles are fluid-filled sacs that hold materials. • Lysosomes contain enzymes to digest material. • Centrioles are tubes found in the centrosomes. – Centrioles help divide DNA. – Centrioles form cilia and flagella. ...
A Recurrent Model of Orientation Maps with Simple and Complex
... resembles data from real cortex. Nearby cells tend to prefer similar orientations except at fractures. There are even regions that are similar to pinwheels (delimited by a white rectangle). A PO is a useful tool to describe a network’s selectivity, but it only paints part of the picture. So we have ...
... resembles data from real cortex. Nearby cells tend to prefer similar orientations except at fractures. There are even regions that are similar to pinwheels (delimited by a white rectangle). A PO is a useful tool to describe a network’s selectivity, but it only paints part of the picture. So we have ...
Cell structure and functions - formatted
... In xylem tracheids and fibres, secondary cell wall is three layered – S1 (thin); S2 (wide); S3 (thin) (Fig. 1). In Sclerenchymatous cells, secondary cell wall with many layers of nearly equal width may be deposited. An intracellular wall substance or middle lamella (ML) cements two cells together. T ...
... In xylem tracheids and fibres, secondary cell wall is three layered – S1 (thin); S2 (wide); S3 (thin) (Fig. 1). In Sclerenchymatous cells, secondary cell wall with many layers of nearly equal width may be deposited. An intracellular wall substance or middle lamella (ML) cements two cells together. T ...
Short-range control of cell differentiation in the Arabidopsis root
... observed in wild-type roots (Fig. 1f, arrow; Table 1). The QC thus controls the differentiation state of columella initials in the absence of cell division. These results show that columella cell division is not a prerequisite for inhibition of differentiation (Fig. 2, model 2). To determine whether ...
... observed in wild-type roots (Fig. 1f, arrow; Table 1). The QC thus controls the differentiation state of columella initials in the absence of cell division. These results show that columella cell division is not a prerequisite for inhibition of differentiation (Fig. 2, model 2). To determine whether ...
BioH Ch7 sec1 PPT
... In 1838, Matthias Schleiden concluded that all plants were made of cells. In 1839, Theodor Schwann stated that all animals were made of cells. In 1855, Rudolph Virchow concluded that new cells were created only from division of existing cells. These discoveries led to the cell theory. Slide 7 of 31 ...
... In 1838, Matthias Schleiden concluded that all plants were made of cells. In 1839, Theodor Schwann stated that all animals were made of cells. In 1855, Rudolph Virchow concluded that new cells were created only from division of existing cells. These discoveries led to the cell theory. Slide 7 of 31 ...
Chapter 35-2
... A stimulus must have enough strength to cause a neuron to start an impulse The minimum level of a stimulus that is required to activate a neuron is called the THRESHOLD ...
... A stimulus must have enough strength to cause a neuron to start an impulse The minimum level of a stimulus that is required to activate a neuron is called the THRESHOLD ...
Cyclin synthesis and degradation and the embryonic cell cycle
... I (Picard et al. 1985). Suggestive as these lines of evidence are, none of them directly demonstrates that cyclin accumulation induces mitosis, or that cyclin degradation is required for the exit from meiosis. To address these issues, we turned to in vitro cell cycle extracts of frog eggs that were ...
... I (Picard et al. 1985). Suggestive as these lines of evidence are, none of them directly demonstrates that cyclin accumulation induces mitosis, or that cyclin degradation is required for the exit from meiosis. To address these issues, we turned to in vitro cell cycle extracts of frog eggs that were ...
Cell Membrane Proteins.
... Proteins: After water, the most abundant substances in most cells are proteins, which normally constitute 10 to 20 % of the cell mass. These can bedivided into two types: structural proteins and functional proteins. Structural proteins are present in the cell mainly in the form of long filaments tha ...
... Proteins: After water, the most abundant substances in most cells are proteins, which normally constitute 10 to 20 % of the cell mass. These can bedivided into two types: structural proteins and functional proteins. Structural proteins are present in the cell mainly in the form of long filaments tha ...
Mitosis
Mitosis is a part of the cell cycle in which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, each in its own nucleus. In general, mitosis (division of the nucleus) is often followed by cytokinesis, which divides the cytoplasm, organelles and cell membrane into two new cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of an animal cell cycle—the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.The process of mitosis is divided into stages corresponding to the completion of one set of activities and the start of the next. These stages are prophase, prometaphase, metaphase, anaphase, and telophase. During mitosis, the chromosomes, which have already duplicated, condense and attach to fibers that pull one copy of each chromosome to opposite sides of the cell. The result is two genetically identical daughter nuclei. The cell may then divide by cytokinesis to produce two daughter cells. Producing three or more daughter cells instead of normal two is a mitotic error called tripolar mitosis or multipolar mitosis (direct cell triplication / multiplication). Other errors during mitosis can induce apoptosis (programmed cell death) or cause mutations. Certain types of cancer can arise from such mutations.Mitosis occurs only in eukaryotic cells and the process varies in different organisms. For example, animals undergo an ""open"" mitosis, where the nuclear envelope breaks down before the chromosomes separate, while fungi undergo a ""closed"" mitosis, where chromosomes divide within an intact cell nucleus. Furthermore, most animal cells undergo a shape change, known as mitotic cell rounding, to adopt a near spherical morphology at the start of mitosis. Prokaryotic cells, which lack a nucleus, divide by a different process called binary fission.