Which of the following does cytosine pair with?
a. Guanine
b. Thymine
c. Adenine
d. Uracil
Answer: a. Guanine
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Many signal transduction pathways utilize second messengers to ____
a. transport a signal through the lipid bilayer of the plasma membrane b. relay a signal from the outside of the cell to the inside c. relay a signal from the inside of a cell membrane to the outside of the cell d. decrease the message once the signal molecules have left the receptor e. relay the message from the inner surface of the plasma membrane throughout the cytoplasm
Lamarck's inheritance of acquired characteristics included the idea that
A. species are only produced through special creation. B. local catastrophes cause mass extinctions of species. C. there is a natural force in all living things that pushes them toward perfection. D. species are fixed and unchanging over time.
Microbial ecologists seek to understand how microbes drive and respond to the biogeochemical cycles that are essential for life on Earth. However, at this time it is only possible to make concrete connections, identifications, or measurements about the abiotic flux of nutrients rather than the interactions between microbes that make these fluxes possible.
Answer the following statement true (T) or false (F)
Which of the following statements about gene families is false?
(a) Because gene duplication can occur when crossover events occur, genes are always duplicated onto homologous chromosomes. (b) Not all duplicated genes will become functional members of gene families. (c) Whole-genome duplication can contribute to the formation of gene families. (d) Duplicated genes can diverge in both their regulatory regions and their coding regions.