Claire, a microbiologist at Yellow Stone National Park, is classifying organisms that were living in one of the natural hot pools. She notes that all of the organisms are prokaryotic cells. She knew this because the specimens lacked:
What will be an ideal response?
membrane bound organelles
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The role of the antenna complex in a photosystem is to
A. transfer excited electrons to the primary electron acceptor. B. generate glucose. C. generate NADPH. D. capture photons from sunlight.
If the relative fitness value is w = 0.6, what is the selection coefficient used to identify the differences between the fitnesses of organisms with different traits?
What will be an ideal response?
Why is an excess of normal deoxyribonucleoside triphosphate molecules (dNTPs) needed during dideoxy sequencing?
(a) DNA polymerase uses the dNTPs to synthesize a DNA molecule complementary to the molecule being sequenced. (b) dNTPs are consumed as energy to fuel the sequencing reactions. (c) When dNTP levels are too low, there will be very few chain-termination events. (d) The dNTPs can hybridize to the fragment to be sequenced and serve as primers for DNA polymerase.
Jim is suffering from congestive heart failure, in which blood flow is backed up in his lungs and excess fluid is escaping the blood and accumulating in his lung tissue. If untreated, increasing pulmonary edema will lead to death by suffocation. What is the most likely cause of Jim's congestive heart failure?
A. Contraction of his left ventricle is not keeping up with contraction of his right ventricle. B. Jim's SA node is malfunctioning. C. Jim's pulmonary semilunar valve is not opening properly. D. Contraction of his right atrium is not keeping up with contraction of his left atrium. E. Jim's right atrioventricular valve (tricuspid valve) is not closing properly.