Restriction endonucleases are produced by
A. fungi.
B. protozoa.
C. plants.
D. bacteria.
E. All of the choices are correct.
Answer: D
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A) low B) high C) spring D) neap
Which of these structures is NOT formed during gastrulation?
a. Blastocoel b. Archenteron c. Endoderm d. Mesoderm e. Ectoderm
Which of the following membranes can give rise to a viral envelope?
A) the nuclear membrane B) the cytoplasmic membrane C) the endoplasmic reticulum D) the nuclear and cytoplasmic membranes E) the nuclear and cytoplasmic membranes and the endoplasmic reticulum
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a. ribosomes b. lysosomes c. mitochondria d. endoplasmic reticula e. Golgi bodies