Embryonic induction, the influence of one group of cells on another group of cells, plays a critical role in embryonic development
In 1924, Hans Spemann and Hilde Mangold transplanted a piece of tissue that influences the formation of the notochord and neural tube, from the dorsal lip of an amphibian embryo to the ventral side of another amphibian embryo. If embryonic induction occurred, which of the following observations justifies the claim of embryonic induction? A) The transplanted tissue induced multiple limbs to develop on the ventral side of the recipient embryo.
B) The transplanted tissue inhibited normal cell division on the dorsal side of the recipient embryo that lead to its death.
C) The transplanted tissue had no effect on either the ventral or dorsal side of the recipient embryo so it continued to develop normally.
D) The transplanted tissue induced the formation of a second notochord and neural tube on the ventral side of the developing embryo.
D
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Benedict's reagent is a chemical that is used as a test for the presence of a free aldehyde functional group on glucose. The aldehyde is used when glucose and fructose bind together to form sucrose, and the Benedict's test is negative. Starch contains a great deal of glucose but gives a negative Benedict's test because:
A. all of the aldehyde groups on the starch are oxidized and cannot react with the Benedict's reagent. B. glucose in starch has lost a carbon atom and cannot react with Benedict's reagent. C. only the glucose at the end of a chain of starch will have an exposed aldehyde functional group to react with Benedict's reagent. D. starch is not soluble in water and cannot react with Benedict's reagent.
A certain wastewater treatment plant uses aerobic bacteria, anaerobic bacteria, and archaebacteria during secondary treatment of sewage. Unfortunately, during a bad blizzard the aerated tanks froze, killing the microbes inside. What is likely to result?
A. Floc levels will diminish. B. Methane production will go down. C. Solid material will not be effectively filtered out. D. Floc will not be effectively filtered out. 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 wastewater treatment with bacteria? 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 advantages of DNA vaccines include
a. no possibility of infection. b. activation of T and B cells. c. targeted immune response. d. all of the above.
Match the following prefixes with their relationship to the standard base unit (g, m, L):
Centi A) 1/100 B) 1/1,000,000 C) 1000 D) 1/1000