1. Rosalind Franklin obtained X-ray diffraction patterns of crystalline B-form D
ID: 255763 • Letter: 1
Question
1. Rosalind Franklin obtained X-ray diffraction patterns of crystalline B-form DNA, which is essential for Watson and Crick to discover the DNA structure. A) True B) False 2. Proteins destined for the secretory pathway are packaged into vesicles that pinch off from the membrane of the ER and fuse with the A) cis face of the Golgi apparatus. B) trans 3. Akt is also called protein kinase B or PKB and promotes programmed cell death called apoptosis. A) True B) False 4. The activated phospholipase C hydrolyzes a membrane inositol phospholipid into two small messenger molecules: Diacylglycerol and Inositol 1,4,5-trisphosphate (P3). A) True B) False 5. The gascan cross the plasma membrane and activate the guanylyl cyclase directly. A) NO ?) ?? 6. When NADH is converted to NAD+, each NADH donates two electrons to the NADH dehydrogenase complex in mitochondria. A) True B) False 7. Nearly all of the oxygen that we breathe is converted to water at the cytochrome b-c1 complexes. A) True B) False 8. The electrochemical gradient of H+ across the inner mitochondrial membrane, which is used for ATP production, is mainly contributed by the H+ concentration gradient (ApH) compared to a relatively smaller force driven by membrane potential (AV). A) True B) False 9. Proton gradient serves as an energy store and is used to drive the synthesis of ATP by the ATP synthase. A) True B) False 10. The double membrane of the nuclear envelope is penetrated by nuclear pore complexes (NPCs) A) True B) False 11. In the cytosol, RanGAP1 (Ran GTPase-activating protein) stimulate Ran GTPase to hydrolyze it bound GTP to GDP A) True B) False 12. Receptor tyrosine kinases (RTKs) phosphorylate selected target proteins on threonine, thereby altering protein activity A) True B) FalseExplanation / Answer
Ans 1 : A) True
The X ray diffraction images of B DNA given by Franklin specially photo 51 led to the disovery of DNA double helix by James Watson and Francis Crick . The later ones received a nobel prize for their such an important discovery.
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