Explain the steps of binary fission
What will be an ideal response?
Binary fission occurs in five main steps. First, the cell that is preparing to divide copies its DNA-containing chromosome, so that each daughter cell will receive a complete chromosome. Because the chromosome is tethered to the cell membrane, as the cell grows, the copied chromosomes separate and are drawn to opposite ends of the cell. Eventually the cell reaches a critical size and a septum (partition) begins to form near the midpoint. The septum, which is essentially the newly forming cell wall, eventually walls off the resulting two daughter cells from one another. The daughter cells may completely separate or they can remain associated to form a variety of cellular arrangements.
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The pistil of a flower is best described as:
A. a structure to defend against insects B. a single carpel or group of fused carpels C. a place where pollen is produced D. a grouping of filaments E. a place for sperm to be produced
How did humans colonize the New World?
A. Early humans walked across a land bridge during periods of lowered sea level. B. Christopher Columbus and a host of other explorers were the first to colonize the Americas. C. Humans drifted across the Atlantic on primitive canoes. D. Humans were present during the break-up of Gondwana. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about human migration? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The gene associated with aggressive behavior identified in 1993 is to be linked to an enzyme called
____________________. Fill in the blank(s) with the appropriate word(s).
In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?
A) DNA contains sulfur, whereas protein does not. B) DNA contains phosphorus, whereas protein does not. C) DNA contains nitrogen, whereas protein does not. D) DNA contains purines, whereas protein includes pyrimidines.