Study guides, Class notes & Summaries

The Biosphere 2 project, in Tucson, Arizona, was an experiment involving a large sealed terrarium with humans and photosynthetic plants living in balance. Why did the project have to be interrupted after only a few months? - Levels of CO2 rose to dangerous levels. The __________ is driven directly by photons from the sun in photosynthesis light reactions. - transfer of electrons Which of the following is an electron transfer molecule in photosynthesis light reactions? - plastoquinone

An experiment with bacteria that has been exposed to an antibiotic reveals that the translocation step has been inhibited. Which antibiotic was likely used? correct answers none of these answers are correct. The correct mRNA secondary structure of transcriptional termination is __________ stem-loop structure. correct answers 3-4 In negative autoregulation, correct answers proteins repress their own gene expression. Which sequence is MOST likely to be prenylated in the ER? (The ... repre...

An Ames test of a compound suspected to be a mutagen was examined before and after incubation with rat liver extract. Based on the results shown, what do you conclude? correct answers Compound is mutagenic without liver enzymes and this activity is further enhanced by liver enzymes Lynch syndrome is a human genetic disease characterized by ~100-fold higher incidence of colon cancer in men and women - and uterine cancer in women - by the age 50, as compared to the general population. Which sta...

Considering the molecular structure, which of the following correctly describes the relationship among carbohydrate nutrition, cAMP levels, CRP, DNA binding, and gene expression? correct answers When cytoplasmic glucose levels are low, cAMP levels will be high, and then the CRP will be activated to bind DNA to activate transcription at certain gene loci. AZT is such a good HIV drug because it correct answers prevents new DNA from being replicated. What is a Holliday Junction? Choose the on...

If 15N DNA replicated using conservative replication in 14N media, the outcome would be that new DNA has correct answers one high density and one low density strand What accounts for the high fidelity of DNA polymerization? Choose the ONE best answer. correct answers Active site geometry ensures that only correct sized nucleotide base pairs are formed, and 3' to 5' proofreading removes incorrect nucleotides. How can DNA strands be synthesized using bidirectional replication? correct answ...

What purpose does glycogen degradation and synthesis serve in animals? correct answers Liver glycogen is short-term energy which provides a way to store and release glucose in response to blood glucose levels. Which of the following is correct concerning the regulation of glycogen metabolism by hormones? -Glycogen phosphorylase is active when phosphorylated, which occurs in response to insulin. -Glucagon activates PKA, which inactivates glycogen synthase -Epi has the same effect as insul...

what causes gout? correct answers gout is caused by a buildup of uric acid crystals in the joints and kidneys, which is very painful 4 major fns of nucleotides in cells? correct answers 1. building blocks of RNA and DNA/genetic info storage and transfer using DNA base pairs 2. the energy currency by phosphoyl transfer reax//energy conversion reactions (such as the ATP synthase complex) 3. coenzyme-dependent reax utilizing NAD+ and FAD 4. signal transduction (by cyclic AMP in phosphoryl t...

The Biosphere 2 project, in Tucson, Arizona, was an experiment involving a large sealed terrarium with humans and photosynthetic plants living in balance. Why did the project have to be interrupted after only a few months? - Levels of CO2 rose to dangerous levels. The __________ is driven directly by photons from the sun in photosynthesis light reactions. - transfer of electrons Which of the following is an electron transfer molecule in photosynthesis light reactions? - plastoquinone The ...