How old is the oldest fossil we have food of our own species, Homo sapiens?
A. About 3 thousand years old
B. About 6 million years old
C. About 6 thousand years old
D. About 300 thousand years old
Answer: D
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Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans?
A. Ciliates B. Rhodophyta C. Choanoflagellates D. Radiolarians E. Myxomycota 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 Porifera? How does it relate to the question? 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?
A heart attack or myocardial infarction is due to the sudden death of heart tissue due to lack of oxygen.
a. true b. false
How would the cDNA created in a lab compare to the original DNA?
A) It would contain only the genes that were producing proteins in the cell at the time the cDNA was created. B) It would be identical to the original DNA. C) It would be a single strand instead of the original double-stranded DNA. D) It would be circular, similar to bacterial DNA.
What causes the rhythmic change in cyclin concentration in the cell cycle?
A) The cascade of increased production once the protein is phosphorylated by Cdk B) An increase in production of a Cdk once the restriction point is passed C) Its destruction by an enzyme phosphorylated by the cyclin-Cdk complex D) The binding of PDGF to receptors on the cell surface E) The changing ratio of cytoplasm to genome