The 3-nucleotide sequences in DNA that is transcribed into mRNA codons are the same 3 nucleotides
as the anticodons that bind to those codons. Indicate whether the statement is true or false.
F
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Which scenario is an example of positive feedback?
a. When oxygen levels are low, the kidneys secrete erythropoietin, which stimulates the proliferation and differentiation of red blood cells until oxygen demands are met. b. As blood pressure increases, specialized neurons relay the change to the brainstem, which in turn, decreases the contractility of the heart and leads to vasodilation, thereby decreasing blood pressure. c. After an injury, chemicals released at the site of injury will activate platelets, which will in turn activate additional platelets, and so on, until the clot has formed and the injury is no longer bleeding. d. When stress levels are high, the hypothalamus secretes corticotropin-releasing hormone (CRH), which in turn stimulates the secretion of adrenocorticotropic hormone (ACTH), which then triggers the release of cortisol. Increased cortisol levels then inhibit the release of CRH and ACTH. e. After eating, when glucose levels are high, insulin levels increase, leading to an increase in glycogen and fat synthesis to remove excess glucose from circulation.
The Asian kudzu bug (Megacopta cribaria) arrived in Atlanta in 2009 and is quickly spreading across the South. In addition to eating kudzu, it also eats soybeans and can decimate entire crops. The kudzu bug is a type of ________ species
A) control B) keystone C) umbrella D) invasive
In the Catalase test, which of the following is the product detected?
A. Hydrogen peroxide B. Freshly produced oxygen C. Water and freshly produced oxygen D. Water
A scientist uses recombinant technology to take a eukaryotic promoter and place it in front of a bacterial structural gene. What is the most likely outcome on bacterial gene expression?
A. Bacterial gene expression will not occur because RNA polymerase enzymes between prokaryotes and eukaryotes are incompatible. B. Bacterial gene expression will increase because eukaryotic RNA polymerase has analogous function to prokaryotic RNA polymerase. C. Bacterial gene expression will increase because both prokaryotic and eukaryotic genes are based on the same four nucleotides. D. Bacterial gene expression will decrease because prokaryotic RNA polymerase can read the same sequences as eukaryotic RNA polymerase.