Which of the following illustrates a negative feedback mechanism that occurs in the human body?
a) the release of insulin from the pancreas in response to an increase in blood sugar levels
b) the release of glucagon from the pancreas in response to an increase in blood- sugar levels
c) the release of oxytocin resulting in uterine contractions as childbirth is underway
d) chemical reactions that result in coagulation due to fibrin being released
Answer: a) the release of insulin from the pancreas in response to an increase in blood sugar levels
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The 140 kbp genome containing many short repeats, ribosomal RNA genes, one RNA polymerase gene (rpo) and one RubisCO gene (rbcL) is most likely from a(n)
A) plant. B) autotrophic bacterium. C) chloroplast. D) autotrophic archaeon.
Which of the following is NOT closely related to any
of the other four? a. turbellarians b. earthworms c. flukes d. tapeworms e. planarians
The promoters of positively controlled operons require activator proteins, because
A) RNA polymerase easily recognizes the consensus sequence. B) they are required to inactivate the repressor proteins. C) the promoters have nucleotide sequences that bind RNA polymerase weakly, which are not close matches to the consensus sequence. D) they are needed to bind to the allosteric site of RNA polymerase.
What is the best way to treat a peptic ulcer?
a. Take antacids only. b. Eat a low fat diet. c. Drink milk to protect the stomach lining. d. Eat a low fat diet and drink milk. e. Take antacids and antibiotics.