Most plant cells differ from animal cells in that they
A. possess nucleoli.
B. lack nucleoli.
C. contain mitochondria.
D. lack centrioles.
D. lack centrioles.
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Organs in developing flowers include all of the following EXCEPT _____
A) shoots B) sepals C) petals D) carpels
A researcher discovers a new antibody. Upon evaluating its sequence, she determines that the antibody is not the result of genomic rearrangement alone. What other processes could have produced this specific antibody? Select all correct choices
A. germ cell hypomutation B. N-nucleotide addition C. alternative mRNA splicing D. somatic hypermutation
Why are membrane-bounded organelles able to facilitate faster chemical reactions?
a. Membranes are permeable to all solutes and their enzymes. b. Enzymes are organized close together on the membrane surface. c. Membranes lower the activation energy of biochemical reactions. d. Membrane-bounded organelles act as catalysts for biochemical reactions. e. Enzymes are more readily available within membrane-bounded organelles
This macrophage, which has phagocytized and displayed the antigen on its surface, is acting as a(n):
A. lymphocyte clone B. antigen-presenting cell C. plasma cell D. memory cell