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Questions in biology

[Homework Help] Earthworms feed on decaying organic matter in soil. What's the best description of how earthworms obtain energy? A. Earthworms are autotrophic. B. Earthworms are ciliate. C. Earthworms are saprotrophic. D. Earthworms are mixotrophic.

[Homework Help] Which nutrient tends to cycle within a single ecosystem? A. phosphorous B. water C. nitrogen D. carbon

[Homework Help] Which molecule is a primary component of fungal cell walls? a) Hyphae b) Mycelium c) Chitin d) Gametangia

[Homework Help] What portion of the diencephalon acts as a relay station for sensory impulses traveling upward to the sensory cortex? A. pons B. thalamus C. hypothalamus D. pituitary gland

[Homework Help] What substance produces itching when released in response to allergens? A. Keratin B. Collagen C. Heparin D. Histamine

[Homework Help] A cross between white and yellow summer squash gave progeny of the following colors: | Color | White | Yellow | Green | |---|---|---|---| | Number of progeny | 155 | 40 | 10 | Are these data consistent with the [tex]$12: 3: 1$[/tex] ratio predicted by a certain genetic model? Use the chi-square test at alpha [tex]$=0.05$[/tex]. (a) Write [tex]$H _0$[/tex] and [tex]$H _1$[/tex]. (b) Calculate the "expected" frequency for each color. A. [tex]$H _0$[/tex]: Ratio among three colors [tex]$=12: 3: 1$[/tex] vs. [tex]$H _1$[/tex]: Ratio [tex]$\neq 12: 3: 1$[/tex] expected values [tex]$=146.75,31.4375,15.8125$[/tex] B. [tex]$H _0$[/tex]: Ratio among three colors [tex]$=12: 3: 1$[/tex] vs. [tex]$H _1$[/tex]: Ratio [tex]$\neq 12: 3: 1$[/tex] expected values [tex]$=155,40,10$[/tex] C. [tex]$H _0$[/tex]: Ratio among three colors [tex]$=12: 3: 1$[/tex] vs. [tex]$H _1$[/tex]: Ratio [tex]$\neq 12: 3: 1$[/tex] expected values [tex]$=0.75,0.1875,0.0625$[/tex] D. [tex]$H _0$[/tex]: Ratio among three colors [tex]$=12: 3: 1$[/tex] vs. [tex]$H _1$[/tex]: Ratio [tex]$\neq 12: 3: 1$[/tex] expected values [tex]$=153.75,38.4375,12.8125$[/tex]

[Homework Help] Maksud ayat adjective

[Homework Help] If the temperature of our oceans continues to rise, what possible long-term effect will this have on marine life? A. The geographic range of phytoplankton will decrease, thus increasing the base of the marine food chain. B. The distribution of marine life will increase due to the increase in temperature. C. The diversity of marine life will increase due to the increase in temperature. D. The available oxygen of ocean waters will decrease, thus reducing marine life diversity.

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] Which is not found on a membrane? A. receptor tyrosine kinase B. intracellular receptor C. ligand-gated ion channel D. G protein-coupled receptor