A DNA molecule consists of two stands of nucleotides that wind around each other like a twisted ladder with a phosphate and sugar backbone. The nitrogenous bases are divided into two groups called the pyrimidines and the purines. The pyrimidines include the thymine and cytosine, the purines are adenine and guanine. The nitrogenous bases in the double helix are bound together according to the base pairing rule. Adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C). The student either drew the base pairing showing adenine and thymine or guanine pairing with cytosine.
Cells build carbohydrate polymers by using energy to form glycosidic linkages, the bonds betweenmonosaccharides. A dehydration synthesis reaction forms a bondbetween carbon atoms in twomonosaccharides, sandwiching an oxygen atom between them and releasing a water molecule.
New moon: we see darkness (aka nothing)
Waxing crescent moon: we see a sliver of light that indicates the crescent (during this time, the moon moves eastward away from the sun)
First quarter moon: when half the moon's face is illuminated.
Gibbous moon: when more than half the moon is illuminated, we call this a gibbous
Full moon: we see the whole round moon, lit up.
Waning gibbous moon: when the moon becomes thinner, but is still lit up for over half of its shape.
Third quarter moon: this is where the moon shows the other half of itself (that we didn't see in the 1st quarter) while the other half is dark.
Waning crescent moon: when the moon is a thin crescent, traveling down into the darkness of the full moon.
This process takes about a month (29.53 days).
