The nervous system develops from which germ layer?
a. ectoderm only
b. mesoderm only
c. ectoderm only
d. endoderm and mesoderm
c. ectoderm only
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In the Krebs cycle, citrate forms when combines with the two carbons of acetyl CoA.
A. oxygen B. a cytochrome C. pyruvate D. NADH E. oxaloacetate
Which of the following animals is most like a
glyptodon?
a. dogs b. finches c. whales d. armadillos e. horses
A cell’s genetic information consists of _____ of its chromosomes
1.which nucleotide bases the DNA contains 2.the sugar group in the nucleotides 3.the orientation of the strands of DNA 4.the order of the nucleotide bases
A primary immune response is the immune response elicited by the
A) primary antigen of a disease-causing microorganism. B) primary antibodies of a disease-causing microorganism. C) first exposure of lymphocytes to a particular antigen. D) first exposure of memory cells to a particular antigen.