T cells don't function properly in patients with DiGeorge syndrome because
A) Autoantibodies attack newly synthesized T cells
B) T cells can't develop properly because of a lack of thymic activity
C) B cells that release growth factor are in short supply
D) Stem cells in the bone marrow don't develop into T cells
D) Stem cells in the bone marrow don't develop into T cells
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Prokaryotes that harvest both energy and carbon atoms from organic molecules are called
A. photoautotrophs. B. chemolithoautotrophs. C. photoheterotrophs. D. chemoheterotrophs. E. nitrogen fixers.
Which of the following happens in the first stage of interphase?
a. The cell replenishes its energy stores and synthesizes the proteins necessary for chromosome manipulation. b. The DNA replicates to form two chromosomes. c. Two centrosomes give rise to the mitotic spindle. d. The cell accumulates the building blocks of chromosomal DNA and associated proteins.
Which of the following is not part of blood plasma?
A. metabolites and wastes B. proteins C. salts and ions D. hemoglobin
A technique that separates a readable pattern of DNA fragments is
A. gel electrophoresis. B. biotechnology. C. gene probes. D. recombinant DNA. E. genetic engineering.