Different structures of cells can exist within the same organism. Different structures of cells may be indicative of different organelles presents different structures mostly arise due to different functions of the cell, as how structure of cells always complement the function of cells hence it is most it is mostly likely the last option that the cells have different functions
A Covalent Bond is the answer.
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Answer:
<u>Sister chromatids are identical forms of chromatids of a chromosomes. They are mostly formed by semi-conservative replication of DNA molecule of a single chromosome.Thus they are like </u><u>'photocopies' </u><u> of original parent chromosomes; joined together at the Centromere</u>.
They are exactly similar in all ramification; with the same gene and allele compositions..
<u>However; slight differences arise between the two identical sisters due to </u><u>mutation</u><u> from</u><u> errors </u><u>at replication;and also in the length of telomere repeats.</u>
Non-sister chromatids are dissimilar forms of chromatids of a chromosomes formed when each half of a chromosome at fertilisation from separate haploid sex-cells, of each parent. fused.They contain different genetic composition;because they are not on the same homologous chromosomes.Therefore crossing -over ensure variation.
<u>However, they are genetically similar in composition; if they are contained in homologous chromosomes</u>. This is because Synapsis of bivalent of these chromosomes allow genetic material to be shared by chromosomal crossing-over between the non-sister chromatids on the chromosomes ; therefore identical genetic characteristics are shared .
Explanation:
The best and most correct answer among the choices provided by your question is the second choice or letter B. "hydrophilic head."
Phospholipids<span> consist of a glycerol molecule, two fatty acids, and a phosphate group that is modified by an alcohol. The phosphate group is the negatively-charged polar head, which is hydrophilic. The fatty acid chains are the uncharged, nonpolar tails, which are hydrophobic.</span>
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56: It's S, south. Magnets have two poles, right? Opposites attract; likes repel. The two are attracted, therefore it must be S. The other side of the magnet is N, North.
57. If you push them together, then they will stick together, because of their magnetic attraction.
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