Genetic equilibrium and allele frequencies are
maintained by all EXCEPT which one of the
following?
a. lack of gene flow
b. large population interbreeding freely
c. differential survival and reproduction
d. random mating
e. absence of mutations
C
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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?
Legionellosis is a zoonosis.
Answer the following statement true (T) or false (F)
The enzyme carbonic anhydrase catalyzes the formation of carbonic acid from carbon dioxide and water. Imagine that you have two sealed tubes with carbon dioxide gas above a buffer containing water and carbon dioxide
One tube has carbonic anhydrase and the other does not. After 24 hours, both tubes are at equilibrium. Which statement below accurately describes the conditions in the tubes? A) The tube with carbonic anhydrase will have a lower concentration of carbon dioxide and a higher concentration of carbonic acid than the tube with any enzyme. B) The tube with carbonic anhydrase will have a higher concentration of carbon dioxide and a lower concentration of carbonic acid than the tube with any enzyme. C) The tubes will have equal concentrations of carbon dioxide and carbonic acid. D) The tube with carbonic anhydrase will have a higher concentration of carbonic acid than the tube with any enzyme, but the concentration of carbon dioxide will be the same in both tubes. E) It is not possible to determine the relative concentrations of the products and reactants without more information about carbonic anhydrase, such as the Km. What will be an ideal response?
Which is true regarding translation in bacteria?
A. Translation ends when the Shine-Dalgarno sequence is reached. B. The 70S ribosome is composed of a 20S and 50S subunit. C. Translation begins with formation of the 30S initiation complex. D. All of the choices are correct.