Answer:
A It makes the most sense!
Explanation:
Hope this helps!
They are organized structures of dna
The first step in the development of a complex organism is the establishment of a pattern of cells with different states that can differentiate along different pathways. … [P]atterning processes require signalling between and within cells, leading ultimately to gene activation or inactivation. Such a process can lead to reliable patterns of cell activities only if all the cells have the same set of genes and obey the same rules<span> [</span>
The correct option is B.
Carrot can be described as a ground tissues because it is formed inside the ground in form of tap root. The remaining options are incorrect for the following reasons:
1. Animals can not make their own food because they do not have chloroplast not because they do not have vacuoles.
2. The main function of dermal tissue is protection from water loss not photosynthesis.
3. The cerebellum controls balance and coordination not cerebrum.
Answer:
The presence of cholesterol in the plasma membranes of some animal cells <u>enables the membranes to stay fluid when cell temperature drops</u>.
Explanation:
Cholesterol is an essential lipid in the basic structure of cell membranes. The membranes must have a fluid structure so that the proteins integrated in them can move ''horizontally'' to interact with their ligands and with other proteins. With excess saturated fat the membranes become rigid, but only with the necessary unsaturated fat the membranes are extremely fluid, and very sensitive to changes in temperature. Cholesterol stabilizes the structure of the membranes; preventing the collapse and crystallization between lipid chains that would lead to loss of fluidity and excessive rigidity in the membrane. By decreasing the temperature; as temperatures drop, fluidity decreases, an effect that partially counteracts the presence of cholesterol.
