The purest form of water containing the fewest solutes occurs in
A) clouds.
B) surface water.
C) groundwater.
D) precipitation.
A
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According to Fig. 9.6, what is a key difference between cell signaling mediated by a surface receptor, compared to that mediated by an intracellular receptor?
A. Cell-surface receptors bind to specific signaling molecules; intracellular receptors bind any signaling molecule. B. Cell-surface receptors typically bind to smaller signaling molecules than those bound by intracellular receptors. C. Cell-surface receptors bind polar signaling molecules; intracellular receptors bind nonpolar signaling molecules. D. Signaling molecules that bind to cellsurface receptors lead to cellular responses restricted to the cytoplasm; signaling molecules that bind to intracellular receptors lead to cellular responses restricted to the nucleus. E. None of these statements about cell signaling differences is correct.
What is an organelle that pinches off portions of its membrane to form a transport vesicle?
a. mitochondrion b. chloroplast c. nucleolus d. Golgi body e. peroxisome
Which statement is true of the female gametophyte of pine?
a. It's a product of repeated cell divisions of the functional megaspore. b. It's haploid. c. It serves as the stored food to be used by the embryo sporophyte upon germination. d. All of the above are true.
Which is false regarding the two-component regulatory system in bacteria?
A. One part of the system is exposed to the external cellular environment while another part is exposed to the cytoplasm. B. The system involves a sensor kinase and a response regulator. C. The sensor kinase is phosphorylated by the response regulator when the extracellular environment changes. D. Regulation of OmpF and OmpC porin proteins in E. coli is modulated by this type of system.