Gymnosperms can be both monoecious and dioecious. What does dioecious mean?
a. a sister group to the angiosperms
b. diploid egg and sperm join at fertilization to form a tetraploid seed
c. male and female sporangia produced by different plants
d. having two ovules per scale in the cone
c. male and female sporangia produced by different plants
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Porous geological structures below the plant root zone where water flows are known as glaciated subterranean lakes.
Answer the following statement true (T) or false (F)
In eukaryotic cells, sequences of mRNA removed before translation are called
A. introns. B. anticodons. C. exons. D. rRNA. E. terminators.
A biologist uses a time machine to collect living material from 2 different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Eukaryotic organisms would be absent from sample A. B. Eukaryotic organisms would be present in both samples but much more common in sample B. C. Prokaryotic organisms would be abundant in sample A but absent from sample B. D. Prokaryotic organisms would only occur in sample B.
Which one of the following is the main reason that a typical eukaryotic gene is able to respond to a far greater variety of regulatory signals than a typical prokaryotic gene or operon?
(a) Eukaryotes have three types of RNA polymerase. (b) Eukaryotic RNA polymerases require general transcription factors. (c) The transcription of a eukaryotic gene can be influenced by proteins that bind far from the promoter. (d) Prokaryotic genes are packaged into nucleosomes.