At the start of translation, where is the initiator tRNA base paired with the start codon?
a. at the A site in the ribosome
b. first at the A site in the ribosome, and then the E site in the ribosome
c. first at the A site in the ribosome, and then the P site in the ribosome
d. at the P site in the ribosome
Ans: d. at the P site in the ribosome
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Which of the following statements about bones is false?
A. Bones are dry and dead, made up of calcium and connective fibers with a few blood vessels running through them. B. Blood cells are produced in the bone marrow. C. Bones are living organs with multiple tissue types and multiple cell types. D. Arthritis occurs when the cartilage between bones wears down.
ADF/cofilin plays a role in
a. the disassembly of microfilaments. b. stimulation of actin filament formation. c. the nucleation of microfilaments. d. the disassembly of microtubules.
This muscular valve prevents gastric juices from flowing back out of the stomach and into the esophagus
What will be an ideal response?
What is the main difference between an open circulatory system and a closed one?
A. An open system will have the blood leave the blood vessels and dump into the lungs or gills while the closed one will retain the blood within the hemocoel. B. The blood within a closed circulatory system does not contain hemoglobin. C. An open system will have the blood leave the blood vessels and dump into the lungs or gills while the closed one will retain the blood within the system. D. An open system will have the blood leave the blood vessels and dump into the hemocoel while the closed one will retain the blood within the system. E. An open system will keep the blood within the blood vessels while the closed one will dump the blood into the hemocoel.