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your friend is intrigued by a recent report of a new species of bacteria that used arsenic instead of phosphate within their DNA. this report spurs his curiosity about alternative life chemistries. he decides to test whether he can find a life from that utilizes selenium instead sulfur.a) briefly explain why your friend chose selenium to replace sulfur.b) if your friend were to analyze one type of macromolecule for the presence of selenium (instead of sulfur), which one of the four types of macromolecules would make the most sence? briefly explain.
A beaker is separated through a barrier which only glucose can pass. The right side has 10 mM glucose and the left side has zeromM of glucose.
Your blot results show that one of the genes had a band by southern blot but no mRNA or protein produced when analyzed by northern and western blot.
Calcium's atomic number is 20. It forms ions with 18 electrons. What is the electrical charge of a calcium ion? a.) +2 b.) +1 c.) -2 d.) -1
A cell attempts mitosis with only one spindle pole, but is otherwise normal. Which of the following is true for this cell?
The same domains and/or motifs are found in many proteins. In fact, a protein's tertiary structure is more conserved (stays the same or same over many generations) than its amino acid structure.
Why does a defective CFTR lead to decrease hydration of the mucus layer in the airways?
Two genes in chromosome 7 of corn are identified by the recessive alleles gl (glossy), determining glossy leaves, and ra (ramosa), determining branching of ears. When a plant heterozygous for each of these alleles was crossed with a homozygous rec..
Your friend claims to have seen several examples of spiteful behaviors performed by various nonhuman animals. You are quite skeptical of this claim, given your understanding of the evolutionary basis for behaviors.
Sperm cells bind to an egg via ZP3, a glycoprotein in the glycocalyx of the egg, and can be inhibited from doing so by adding an excess of free oligosaccharide. You are interested in finding the protein on the sperm cell responsible for binding to..
An amateur horse breeder has acquired four new bay-coloured mares (female horses) with uncertain pedigree. What are the probable genotypes of the mares purchased.
A botanist studying waterlilies in an isolated pond observed 3-leaf shapes in the population, round, arrowhead, and scalloped.
You are required to pick up a bag and move it a few meters. Describe the function of the arm, shoulder and leg muscles used.
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