For changes that occur in response to environmental conditions, changes in gene expression are most likely due to
____, while changes in DNA sequence are more likely due to ____.
a. evolutionary adaptation; acclimatization
b. evolutionary adaptation; acclimation
c. evolutionary adaptation; biorhythms
d. acclimatization; evolutionary adaptation
e. acclimation; evolutionary adaptation
ANSWER: d
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Vessel elements must be thinner and shorter than tracheids because they lack the structural integrity to support large angiosperm trees
A. true B. false
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)
Viruses with a tail attached at one side of a polyhedral head are called ____
a. simple viruses b. helical viruses c. enveloped viruses d. complex viruses e. viroids
Which gene(s) produce proteins that control the cell cycle?
What will be an ideal response?