Explain how similarity in amino acid sequences among species indicates shared ancestry
What will be an ideal response?
Changes in amino acid sequence due to mutation, that don’t disrupt the functioning of a protein
accumulate gradually over time. The further back in time that the ancestors of two species split from
one another, the greater the accumulation of these changes in their separate lineages. Species that share
a more common ancestor have more similar amino acid sequences because fewer changes have
occurred.
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The following quote is taken from a university extension publication for farmers:
"Grain poisoning, also known as grain overload or lactic acidosis, is usually the result of stock consuming large quantities of grain or pellets to which they are unaccustomed. Pasture-fed cows or feedlot cattle not yet adapted to grain may become acutely ill or die after eating only moderate amounts of grain, whereas stock accustomed to diets high in grain content may consume large amounts of grain with little or no effect." What is happening in the digestive system of the livestock that causes grain poisoning and why does a gradual shift in diet avoid this problem? What will be an ideal response?
A nepron
a. is a kidney tubule. b. cleanses the blood. c. forms urine. d. connects the kidneys to the bladder. e. is all of these except d.
Symptoms of phenylketonuria (PKU) may be
minimized or suppressed by a diet low in a. serine. b. glycine. c. phenylalanine. d. proline. e. glutamic acid.
Which method would best meet the need in generating GM plants if food crops were threatened by invasive insect species?
A) selective breeding B) CRSPR-cas C) agrobacterium-mediated technology D) biolistic methods