Now that you have identified the sequence of the daughter strand based on the sequence on the parent strand, can you come up with an equation that explains the relative proportions of each base in a dna macromolecule? (note that in the equation below, "g" represents the percentage of bases that are guanine, "t" represents the percentage of bases that are thymine, "a" represents the percentage of bases that are adenine, and "c" represents the percentage of bases that are cytosine.)

Environmental differences within ecosystems are generally caused by

Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?