Which is true regarding translation in bacteria?
A. The 70S ribosome is composed of a 20S and 50S subunit.
B. Translation begins with formation of the 30S initiation complex.
C. Translation ends when the Shine-Delgarno sequence is reached.
D. All of the choices are correct.
Answer: B
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A cytologist is examining a tissue under an electron microscope. He notices that the endoplasmic reticulum of each cell is extremely rough in appearance and he knows that the rough appearance is because of the ribosomes embedded there. He asks why there are so many ribosomes. You respond,
A. "This tissue exports lipids and is very involved with mRNA production." B. "This tissue exports proteins to other areas of the body." C. "This tissue exports various nucleic acids, hence the large number of ribosomes present on the endoplasmic reticulum in each of those cells."
The extinction of the _____ during the end-Cretaceous mass extinction allowed mammals to diversify through the process of _____
A. ammonites; peripatric speciation B. dinosaurs; peripatric speciation C. dinosaurs; adaptive radiation D. ammonites; adaptive radiation E. cephalopods; adaptive radiation
Four of the five genes listed below occur in
Drosophila. Select the exception. a. dunce b. wingless c. witless d. tinman e. minibrain
Which of the following is not a characteristic of cancerous cells?
A) contact inhibition B) unusual shapes and sizes C) immortality D) All of the above are characteristics of cancerous cells.