Answer:
Nitrate
Explanation:
Bacteria can direct their movements according to the presence of particular molecules found in the environment. Chemotaxis enables the movement of bacteria in response to environmental factors, including chemical factors. Nitrate is an anion (i.e., negatively charged) that acts both as an electron acceptor during anaerobic respiration as well as a source of nitrogen during aerobic growth. Bacterial nitrate chemotaxis is a phenomenon that occurs under environmental conditions associated with nitrate starvation (i.e., nutrient stress), during the life cycle of diverse types of bacteria. Moreover, methyl-accepting chemotaxis proteins are receptors widely distributed in the cytoplasmic membrane of bacteria and archaea. These receptors form hexagonal arrays that act in signal transduction pathways by processing environmental inputs (in this case, nitrate conditions).
Hot and Dry
Hot and dry deserts, such as the Sonoran Desert
of Arizona and northwestern Mexico, are warm year-round with an extreme
range of diurnal (daily) temperatures because of low humidity. Brief but
heavy storms may occur seasonally. Soil is hard and rocky. Burrowing
mammals, insects and reptiles are the main fauna. The Great Sandy Desert
of Australia and the Sahara of north Africa fall under this category.
Semi-Arid
Semi-arid
deserts, such as the Great Basin of Nevada and western Utah, have long
dry summers plus winter rainfall. Dew fall may exceed rainfall. Soil is
sandy and rocky, and may include “caliche” (pans of calcium carbonate).
Fauna is consistent with hot and dry deserts.
Answer: A red pigment is capable of absorbing cyan light. That is, red paper can absorb both green and blue primary colors of light (recall that cyan light is a mixture of green and blue light). So red and green light shine on the paper; and green light is subtracted.
Explanation:
Answer: A law in science is a generalized rule to explain a body of observations in the form of a verbal or mathematical statement. Scientific laws (also known as natural laws) imply a cause and effect between the observed elements and must always apply under the same conditions.
Explanation:
Examples of scientific laws (also called “laws of nature”) include the laws of thermodynamics, Boyle's law of gasses, the laws of gravitation. ... A law is used to describe an action under certain circumstances. For example, evolution is a law — the law tells us that it happens but doesn't describe how or why.
Stratum corneum is made of dead keratinized cells that can't be infected, while stratum basale is made of living cells that can be hosts for this virus.