________ are carrier proteins embedded in the membrane that increase the rate of diffusion of specific molecules across selectively permeable membranes.
Fill in the blank(s) with the appropriate word(s).
Permeases
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To replicate, a virus must ________
a. undergo mitosis b. self-assemble from abiotic chemical reactions c. undergo prokaryotic fission d. inject its genome into a cell and force the cell to make a new virus
A pharmaceutical company is researching potential drugs that would allow patients to grow stronger nails and hair. The company is considering the purchase of a patent for a molecule that has been shown to significantly accelerate the growth of microtubules in eukaryotic cells and has hired you as a consultant before patent negotiations have begun. What advice should you give?
a. The company should not purchase this patent because the rate at which microtubules grow is inversely proportional to their overall strength. b. The company should not purchase this patent because it is extraordinarily unlikely that the results will transfer to prokaryotic cells. c. The company should not purchase this patent because keratin fibers are not microtubules but rather intermediate filaments. d. The company should purchase this patent because microtubule growth is the largest inhibiting factor for nail and hair strength.
A human population with an age structure diagram that is narrower at the base than at the top would
have ____.
a. zero population growth b. r < 0 c. r > 0 d. been affected by density independent factors e. (K ? N)/K < 1
Mesophyll tissue is part of the root system of a plant.
Answer the following statement true (T) or false (F)