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list the four phases of mitosis and briefly explain what occurs during each phaseprophase the chromatin coils and produces chromosomes the nucleolus
list the five major phases of the cell cycle and briefly explain what happens during each phaseg1 phase the cell grows s phase dna is copied g2 phase
some relatively simple eukaryotes like the adders tongue fern may have many more chromosomes than a more complex eukaryote like a mammal what might
how is the structure of a mitochondrion well adapted for the activities it carries outthe mitochondrial membranes segregate the enzymes and reactants
the vitamin niacin is a necessary component of nad niacin can be consumed in food or manufactured in the body from tryptophan an amino acid how would
of what importance are lactic acid fermentation and alcoholic fermentation to the cells that use these pathwaysthese pathways regenerate nad which
stomata can open and close in response to changes in the co2 concentration inside the leaf would you expect stomata to open or close if the co2
why the rate of photosynthesis does increases peak and then reduces as temperature increases increasing the temperature initially accelerates the
how do cam plants vary from both c3 and c4 plants cam plants open their stomata at night while c3 and c4 plants open their stomata during the
which photosystem-i or ii-most likely evolved first describe your reasoningphotosystem ii most likely evolved first because it changes electrons lost
how does the structure of a chloroplast enable it to build up a concentration gradient of protons chloroplasts have an inner membrane system
a why is it significant that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer b why is photosynthesis
explain how a cell produces and releases proteins proteins are made on ribosomes and packaged into vesicles by the golgi apparatus the vesicles move
describe how a phagocyte destroys bacteria the phagocyte forms a pouch in its cell membrane and engulfs bacteria in the pouch it then pinches off the
how does the interaction between a carrier protein and the substance it transports resemble the interaction among an enzyme and its substrateboth
how do carrier proteins transport substances across cell membranes carrier proteins bind to a molecule of the substance on single side of the
what happens to the movement of molecules at equilibriumat equilibrium the movement of molecules continues but because there is no concentration
bacteria have a region known as a nucleoid in which their genetic material is located why then are bacteria classify as prokaryotesthe nucleoid is
determine the appearance of a plant cell when water is plentifulwhen water is plentiful the central vacuole expandsthe other organelles are pushed
what is plant cell walls made ofexplain the function of cell walls plant cell walls are made of cellulose embedded in carbohydrates and proteinscell
how are secondary cell walls different from primary cell wallsprimary cell walls are assembled on the surface of the plasma membrane whereas the cell
when lipid is added to a solution of a detergent in water the detergent breaks up large globules of the lipid into much smaller globules what effect
what is the cytoskeleton and what are three of its main componentsthe cytoskeleton is a network of long protein strands located in the cytosolthree
what roles do membrane proteins play in transporting only certain substances into a cellsome proteins form channels or pores by which certain
how are the organelles of a single cell like the organs of a multicellular organism name two features of eukaryotic cells that prokaryotic cells lack