The cell membrane functions as a selective barrier. We call these kind of membranes as differentially permeable or semi permeable membrane. It can decide what substances can pass in and out. Therefore it can surround the cytoplasm (which is the inside of a cell) to separate the cell's content from the surroundings.
Answer:
TT and Tt
Explanation:
Becuase the dominant allele can mask the recessive one, both TT and Tt are correct.
None of the provided options are reasonable. <span>comparing nutrient concentrations between the photic zone and the benthic zone can not tell you whether differences in concentrations between the photic and benthic zone are due to uptake by phytoplankton or because nutrients are sinking to the sea bottom and ocean stratification is preventing mixing. The approach of c</span><span>ontrasting nutrient uptake by autotrophs at different locations under different temperatures would not provide useful information on limiting nutrients. but rather uptake rates at different temperatures. It is likely that e</span>xperimentally enriching some areas of the ocean and compare their productivity to that of untreated areas can provide an indication of limiting nutrients, but this is not advisable, as it would have to be done on a large scale, and one cannot be sure of the ecological consequences. Also, because it would not be a controlled experiment, other factors could create 'noise' in the data. The last option, <span>observe antarctic ocean productivity from year to year to see if it changes, also does not help, as there is no correlation between nutrient concentrations using this approach. The best approaches would be either the last approach, but with the additional monitoring of nutrient concentrations, or under a controlled laboratory experiment.</span>
Answer:
Amoeba;
Explanation:
Amoeba:
Amoeba will contain nucleus (contain the genetic information). Nucleus normally appears as dense circular mass under microscope.
Organelles are present. Organelles appears like distinct masses that are rounded in shape and smaller than nucleus.
Plasma membrane is present.
Bacteria;
Nucleus will be absent in bacteria. The nucleoid normally appear lighter in color under microscope.
Ribosomes will be present. Ribosomes appears like black dots within the cytoplasm.
No plasma membrane will be present.
Answer:
are larger in size and require more initiation factors in order to be positioned properly on the mRNA
Explanation:
Eukaryotic ribosomes are larger than prokaryotic ribosomes. 60S large sub unit and 40S large sub unit come together to form 80S final unit. It has a mass of 4200 kd. In contrast prokaryotes have 70s ribosome made of 50s and 30s sub units and has a mass of only 2700 kd.
Initiation factors are required at the beginning of translation process. They bind to small sub unit of ribosome to begin translation. Eukaryotes have more initiation factors than prokaryotes. Bacteria usually have initiation factors IF-1, IF-2 and IF-3. Whereas eukaryotes' initiation factor is called as eIF and more than six types are present.