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  • Illustration of the DNA double helix. The sugar-phosphate backbone of the two complementary strands are visible (red and blue).
  • Implantation of blastocyst
  • Effacement and dilatation of the cervix before birth
  • Bipolar disorder
  • Menstrual cycle
  • Bipolar Disorder
  • Alzheimer’s Disease is a degenerative disorder of the brain which starts in middle or late life. It mainly affects the frontal and temporal lobes of the brain, where the cortex becomes atrophied. Plaques containing an amyloid-like protein have been found within the cortex on examination.
  • Ovulation
  • Anxiety
  • Illustration depicting semi-conservative DNA replication. Three generations of DNA are shown. After separation of the DNA double helix, two new complementary DNA strands are synthesised (indicated by a new colour). Complementary base pairing and hydrogen bonding results in formation of a new double helix.
  • Illustration depicting semi-conservative DNA replication. A DNA double helix prior to replication is shown in the top left of the image. The sugar phosphate backbone and nucleotide bases are visible. Complementary base pairing of adenine with thymine (blue with green) and guanine with cytosine (red with yellow) is shown. During replication, a length of the double helix temporarily unwinds and separates into two strands. Free nucleotides bind by complementary base pairing to the recently exposed nucleotides on each strand which act as a template. Two new double helices are formed, each containing one original generation and one new generation strand of DNA. The sequence of base pairs in each double helix is identical to the original.
  • Right Fallopian tube and ovary
  • Morula