Describe the events that convert an mRNA into a cDNA
What will be an ideal response?
1) A synthetic oligo-dT is allowed to anneal to purified RNA.
2) Reverse transcriptase is used to copy the mRNA into DNA using the oligo-dT as a primer.
3) The mRNA is then degraded with alkali.
4) To prime synthesis of the second strand, an oligonucleotide can be ligated to the 3' end of the DNA.
5) DNA polymerase I extends from the primer to create a double-stranded DNA.
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Materials are returned to the blood from the filtrate by which of the following processes?
A) filtration B) ultrafiltration C) selective reabsorption D) secretion E) excretion
Considering the human body as an ecosystem, which of the following statements is incorrect?
A. Microbes act as producers, consumers, and decomposers within the human ecosystem. B. The human ecosystem lacks an autotrophic niche. C. The microbiota in the human gut is comprised of heterotrophs. D. Energy for the human microbiome derives exclusively from the food we eat.
Which term denotes the conditions, resources, and interactions necessary for survival and reproduction of a species?
a. habitat b. niche c. carrying capacity d. community e. ecosystem
What is the key difference between protostomes and deuterostomes?
a. Protostomes are animals with soft exteriors and deuterostomes are animals with hard exteriors (i.e., shells). b. Protostomes represent a lineage of bilaterally symmetrical animals, whereas deuterostomes represent a lineage of radially symmetrical animals. c. The protostome gut develops from back to front and the second opening becomes the mouth. The deuterostome gut develops from front to back, so the first opening is the mouth. d. The protostome gut develops from front to back, so the first opening is the mouth. The deuterostome gut develops back to front and the second opening becomes the mouth. e. Protostomes represent animals that are prokaryotes, and deuterostomes represent all over animals.