Hans Spemann has referred to which of the following structures as the primary organizer in the early development of amphibian embryos?

A) optic cup
B) notochord
C) neural tube
D) dorsal ectoderm
E) dorsal lip of the blastopore


Answer: E) dorsal lip of the blastopore

Biology & Microbiology

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While many Archaea are bacilli or cocci, unusual morphologies such as square, flattened and irregular discs have also been identified in certain species

Indicate whether the statement is true or false.

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In plasmodial slime molds, what structure is responsible for producing the haploid cells that disperse into the environment?

A. slug B. pseudopodium C. sporangium D. mucilage E. None of the answers options is correct.

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The ability of certain bacterial cells to take on different cell shapes is known as

A) meiosis.
B) pleomorphic.
C) pallidic.
D) pyloric.
E) fission.

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What advantage does the activity of osteoblasts and osteoclasts impart to vertebrates, even after growth has finished?

A) As old bones are dissolved, new bones can be formed. B) The cells enable bone to lengthen and shorten as needed. C) Bone growth never finishes; it continues at a slow pace throughout life. D) The cells allow bone to get stronger as physical demands are placed on it.

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