In chemistry, what is a base?

a. A base is any substance that increases the hydrogen ion (H+) concentration in a solution.
b. A base provides either hydrogen ions (H+) or positively charged ions that combine with hydroxide ions (OH-).
c. A base provides either hydroxide ions (OH-) or negatively charged ions that combine with hydrogen ions (H+).
d. A base is any substance that increases the hydroxide ion (OH-) concentration in a solute.


c. A base provides either hydroxide ions (OH-) or negatively charged ions that combine with hydrogen ions (H+).

Biology & Microbiology

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Recall the classic experiments that Charles Keeling performed at Mauna Loa (Figure 25.1). What did Keeling's research reveal about atmospheric CO2 levels?

A. that atmospheric CO2 levels fluctuate seasonally B. that atmospheric CO2 levels are lowest during the spring C. that atmospheric CO2 levels remain constant throughout the seasons D. that atmospheric CO2 levels have decreased over the last 50 years E. All of the answers options are correct.

Biology & Microbiology

Which of the following organisms is most likely to have a uniform population distribution?

a. Dandelion plants b. Territorial penguins c. A herd of gazelle d. Oak trees that drop their seeds

Biology & Microbiology

Based on the simulation of allele frequencies in an infinite population under Hardy Weinberg equilibrium, does the dominance of an allele have any influence on its allele frequency in future generations?

a. yes b. no

Biology & Microbiology

If the innate immune response is not effective,

what form of immune response occurs next?

a. antigen detection of PAMPs b. phagocytosis c. NK cells start destroying cells d. antigen detection by antibodies e. more than one of these occurs next

Biology & Microbiology