Some scientists propose that the kingdom Protista should be broken up into several kingdoms. Which of these statements accurately supports this idea?
a. Protists are all very similar and easy to confuse
b. Protista contains very diverse organisms that do not fit into the other kingdoms
c. Protists are the most numerous organism on Earth
d. Protista evolved before any other kingdoms
Ans: b. Protista contains very diverse organisms that do not fit into the other kingdoms
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Bacteria have a region of the cytoplasm known as the ________, which is not bounded by a membrane but contains the chromosome.
Fill in the blank(s) with the appropriate word(s).
Which is correct about DNA replication?
A. DNA polymerase can build DNA from scratch. B. DNA is made conservatively. C. The place where the parent DNA becomes unzipped during DNA replication is called the replication fork. D. DNA polymerase adds nucleotides in the 3' to 5' direction. E. The strand made continuously is the lagging strand.
When does crossing-over occur?
A) Prophase I of meiosis B) Prophase II of meiosis C) Interphase prior to meiosis D) At any time during the second meiotic division E) At any time throughout division
Communities are composed of:
a. all of the communities of all the different populations that live together within an area. b. all of the ecosystems within the biosphere. c. all of the populations of all the different species that live together within an area. d. all of the various dispersal patterns of the different species within a given area. e. all of the population's females' combined reproductive capabilities within the same given unit of time.