Which of the following investigators was (were) responsible for the following discovery? In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine
A) Alfred Hershey and Martha Chase
B) Oswald Avery, Maclyn McCarty, and Colin MacLeod
C) Erwin Chargaff
D) Matthew Meselson and Franklin Stahl
C
You might also like to view...
When a chromosomal rearrangement, such as an inversion, places a known gene into or next to a heterochromatic region, the gene's transcription
A) will turn on. B) may be amplified. C) may cease. D) may be inverted.
Expiration is the same as exhalation.
a. true b. false
Each of the following is true about plant rosettes except
A) rosettes are localized in the plasma membrane. B) rosettes are cellulose-synthesizing enzyme complexes. C) rosette deposition of cellulose microfibrils is directed by microtubules. D) rosettes move in the plasma membrane to deposit growing cellulose microfibrils. E) rosettes deposit cellulose microfibrils only in the middle lamella.
Describe the events that occur in the clotting of blood by choosing the correct sequence of statements that outlines the process.1. Platelets and injured tissue release prothrombin activator.2. The activated fragments join end-to-end, forming long threads.3. Platelets clump at the sight of puncture and partially seal the leak.4. Fibrin threads wind around the platelet plug in the damaged area and provide a framework for the clot.5. Thrombin, acting as an enzyme, severs two amino acid chains (activated fragments) from each fibrinogen molecule.6. Prothrombin activator converts prothrombin to thrombin.7. Red blood cells are trapped within the fibrin framework forming a clot.
A. Sequence: 1, 2, 6, 7, 4, 3, 5 B. Sequence: 3, 1, 6, 5, 2, 4, 7 C. Sequence: 4, 5, 6, 7, 3, 2, 1 D. Sequence: 7, 4, 5, 2, 3, 1, 6