The flying beetle known as the firefly or lightning bug is named for its most noticeable feature: its night-time bioluminescence, or glow. The firefly's light-producing organ contains calcium, the pigment luciferin, the light-producing enzyme luciferase and the chemical adenosine triphosphate (ATP). When oxygen is added to this mix, it creates light, and the insect glows. Scientists don't fully understand how the firefly makes its light blink, but one theory is that the firefly turns the light on and off by controlling the input of oxygen into the light-producing organ.Which organisational structure does this text primarily use?

Fireflies emit light. The production of light by an organism is called bioluminescence. To generate visible light, cells in a firefly's tail produce thousands of luciferase enzymes. Luciferase binds to a chemical called luciferin. Once bound, the luciferase enzyme speeds up a chemical reaction that combines an oxygen molecule and luciferin to produce oxyluciferin. This reaction requires energy and releases light. Which of the following best describes how the luciferase enzyme speeds up the chemical reaction. Ask Studybuddy (Login to use)Group of answer choicesLuciferase increases the amount of time the light is visible.Luciferase decreases the amount of energy required for the reaction to startLuciferase increases the number of sites on luciferin that must bind to oxygenLuciferase decreases the temperature of the environment inside the body of the firefly

What term is given to the emission of light by living organisms such as a fireflies or bacteria?photoluminescencebioluminescenceelectroluminescenceradioluminescence

Paragraph 5: Bioluminescence serves a variety of functions. As described earlier, photophores canbe used by fish and squid as a form of camouflage to break up the body outline and as counterillumination to match background light levels. Some lantern fishes probably use light organs toimprove visibility when seeking prey. In at least some lantern fishes, the location and pattern of lightflashes is probably used to communicate between individuals within a species and to distinguishbetween sexes and aid in selecting a mate. Many creatures use bioluminescence for defensivepurposes; large gelatinous animals such as jellyfish, ctenophores, and salps produce an explosiveburst of bioluminescence across the body when disturbed. This presumably serves to blind ordistract the predator temporarily. Some jellyfish, ctenophores, and squid shed luminescingtentacles when attacked. A few squid and octopuses produce bioluminescent ink to dazzle andconfuse attackers while they escape under cover. Some zooplankton—particularly copepods,ostracods, and shrimps—squirt a bioluminescent fluid as defense.4. The word "presumably" in the passage is closest in meaning toA: clearly B: probably C: usually D: periodically5. According to paragraph 5, lantern fishes may use bioluminescence for all of the followingpurposes EXCEPTA: choosing a mateB: communicating with other lantern fishC: finding preyD: escaping from predators6. According to paragraph 5, in which of the following ways can bioluminescence function?A: As a means of blinding or confusing a predatorB: As a means of poisoning or killing predatorsC: As a way of making the body outline more distinctD: As a way of attracting prey

"Bioluminescence" refers to light produced by living organisms. Bioluminescent bacteria are mostly found in marine environments, where they live in symbiosis with other marine organisms. One commonality in the chemical reactions that cause bioluminescence in bacteria is the dependence on oxygen. According to a study by Eveline Brodl and colleagues, the enzyme luciferase acts as a catalyst, helping the oxidation process of substrates that emit light-producing photons. Luminous bacteria is often associated with fecal pellets in the ocean. Fishes are attracted to the luminous debris and by ingesting it, they enter into a symbiotic relationship with the bioluminescent bacteria, allowing the bacteria to thrive in the rich nutritional environment of their guts.Based on the text, how is the enzyme luciferase believed to be involved in the bioluminescence observed by Brodl and colleagues?Luciferase is the main reactive agent that mixes with substrates in the bacteria and allows them to produce the light-emitting photons. eliminateLuciferase allows bioluminescent bacteria to live in the nutrient-rich environment of fish guts, providing the bacteria with the chemicals they need to produce light. eliminateLuciferase stimulates the chemical reaction with oxygen that results in in the emission of photons that give the bacteria their bioluminescence.eliminateLuciferase attracts fish to fecal matter, causing them to digest bacteria and enter a symbiotic relationship.

In our daily life we use electricity for various activities. The electric lamps andtubes light our houses, we listen music on a tape recorder or radio, see differentprogrammes on television, enjoy cool breeze from electric fan or cooler, and useelectric pump to irrigate fields. In fact, electricity is a unique gift of science tomankind. We can not imagine life without electricity in the modern world. Athome you might have observed that as soon as you switch on an electrtc lamp, itstarts glowing. Why does it happen? What is the function of a switch?