The selective movement of specific small molecules and ions into excretory system tubules is
a. reabsorption.
b. release.
c. filtration.
d. secretion.
e. diffusion.
D
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Choose the item in column 2 that best matches each item in column 1.
A) breaking and capping actin B) increase cellular surface area C) assembly and disassembly D) terminal web E) control microtubule organization F) plectin G) central shaft H) nucleating actin branches I) bind to profilin and CapZ J) oligomer formation K) nucleating tubulin branches L) hemidesmosome M) decorate the actin microfilament N) dynein O) prevents loss of subunits P) desmosome Q) nuclear lamina R) account for 10-15% of microtubules S) inhibits microtubule assembly T) two identical polypeptides joined end-to-end U) found in cilia and flagella 1) axonemal microtubules 2) nucleation 3) treadmilling 4) nocodazole 5) motor MAPs 6) Arp2/3 complex 7) myosin subfragment 1 (S1) 8) capping protein 9) gelsolin 10) microvilli 11) filamin 12) polyphosphoinositides 13) nonmotor MAPs 14) axoneme 15) microtubule-associated proteins (MAPs)
Dandelions, Taraxacum officinale, are plants that asexually produce fruitlike propagules. Sexual reproduction is very rare in this organism. Which species concept would be least useful in defining dandelions as a species?
A. Phylogenetic species concept. B. Biological species concept. C. Evolutionary species concept. D. Ecological species concept. E. Both the evolutionary and ecological species concepts.
NADP+ gets its electrons to become NADPH
in the light-dependent reactions of photosynthesis from
a. ATP synthase b. the flow of hydrogen ions c. electron transfer chains d. oxygen gas e. glucose
Consider a population in which two alleles, A and B, with frequencies F(A) = a and F(B) = b, segregate at a sin-gle locus. Which of the following genotypic frequencies are expected in this population under a Har-dy–Weinberg equilibrium?
a. 2a(1-a) b. a(1-b) c. b2 d. All of the above e. None of the above