A bacterium undergoes four rounds of replication. How many cells would result, and how many of those cells would
still have part of an original DNA strand from the starting bacterium?
What will be an ideal response?
ANSWER: After four rounds of replication there would be 16 cells. Of those 16 cells, only two would
have an original DNA strand.
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The polysaccharides agarose and carrageenan are isolated from red algae for commercial use. These polysaccharides are found in cell walls. What plant polysaccharide are they analogous to?
A. Amylose B. Collagen C. Cellulose D. elastin E. Mannose 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 agarose and carrageenan? How does this help you decide which statements are true? · What other information do you need to determine the answer? 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 vast majority of proteins expressed early in an animal's development
a. are translated from preexisting mRNAs present in the unfertilized egg. b. are translated from preexisting mRNAs delivered by the sperm that fertilized an egg. c. are translated from mRNAs that were transcribed from the zygote's DNA in the first three rounds of cell division. d. are transcribed and translated from the unfertilized egg's DNA postfertilization. e. were present as inactive proteins in the unfertilized egg.
In female mammals, most genes on one of the two X chromosomes are permanently inaccessible, and
this phenomenon is called __________. Fill in the blank(s) with the appropriate word(s).
Which of the following statements is false?
a. About 300 species of turtles currently exist. b. Turtles do not have teeth. c. Turtle shells are enlarged in marine forms. d. Turtles must return to land to lay eggs. e. Most sea turtle species are highly endangered.