1 hiertion and deletion mutations can be caused by which of the folowr A strand slippage during replication a) depurination C)unequal crossing over D)A and OA and c mutation results template strand, a(n)_ A) translocation E) none of the above 8) insertion C) deletion D) transversion 21. All diseases caused by trinucleotide repeat expansions result from the expansion ofa CAG repeat FALSE A) TRUE 22. The expansion of trinucleotide repeats A) only occurs if the mothers drink and do drugs or do not have a healthy diet 8) occurs naturally as a result of hairpin structures forming within the newly synthesized strand as the repeat region is replicated or as a consequence of unequal crossing over between homologous Chromosomes during cell division; C occurs naturally as a result of hairpin structures forming within the original template strand as the repeat region is replicated or as a consequence of unequal crossing over between homologous chromosomes during cell division; D) occurs only in females E) only occurs in males 23. Fragile X Syndrome, a leading cause of intellectual disability accompanied by behavioral and learning challenges and various physical characteristics in males, results from which of the following types of mutation? A) single base substitution B) deletion of nucleotides Gexpansion of a trinucleotide repeat D) chromosomal translocation E) single base insertion 24. A translational stop signal; a mutation changes the sequence of the DNA and alters the amino acid coding of the DNA. A nonsense; missense mutation changes the sequence of the DNA and changes the amino acid coding to a premature B) neutral; silent C) missense; nonsense D) silent; neutral E) none of the above
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
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