When a plant is heterosporous, what does this mean?
a. It has both sporophyte and gametophyte generations.
b. It has male and female gametes.
c. It has two spore types.
d. It has separate male and female plants.
Ans: c. It has two spore types.
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With regard to translation in prokaryotes, the gene products are often encoded on polycistronic mRNAs. As a result, the quantities of each of the proteins are often graded, such that the first gene has a great deal of protein translated, whereas the last gene has very little. Which of the following features of prokaryotic translation may account for increased production of some products and
decreased production of others? A) The different messages have sequences with more or less homology to the Shine?Delgarno sequence; fewer ribosomes binding results in less product. B) Feedback regulation of ribosomes tells the cell that enough product is made, and ribosomes from such mRNAs dissociate. C) Because transcription and translation in prokaryotes are essentially coupled, there is no gradation in the amount of individual proteins made from a polycistronic message. D) There is no termination sequence at the end of each gene, so one long protein is made, resulting in equal amounts of products. E) all of the above
When did the ocean begin to form?
a. 200 million years ago b. 4.2 billion years ago c. 5 billion years ago d. 3.4 billion years ago
Pulmonary veins carry
a. oxygen-rich blood. b. oxygen-poor blood. c. blood back to the heart. d. blood from the heart. e. a combination of two of these
Prior to the early 1900's, why did surgeons refuse to wash their hands?
A) There were few infections so it did not seem necessary. B) They wore thick gloves so the risk to patients was small. C) It was simply too time consuming.