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siniylev [52]
3 years ago
6

Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. because this light generation is an atp-req

uiring reaction, firefly luciferase can be used to test for the presence of atp. in this way, luciferase can test for the presence of life. the coupled reactions are
Biology
2 answers:
Blababa [14]3 years ago
5 0

Answer:

Luciferase is an enzyme that belongs to the oxidative enzyme set of some bioluminescence reactions. This phenomenon was discovered by Rafaël Dubois, who detected the emission of light in some living things was nothing more than an enzymatic oxidation, in which luciferase was the catalyst, and luciferin the substrate. This phenomenon was frequently detected in fireflies and in the <em>Pholas dactylus</em> mollusk, and later in Cnidarians (<em>Renilla reniformis</em>), marine copepods (<em>Gaussia princeps</em>), abyssal molluscs (<em>Oplophorus gracilirostris</em>), bacteria, etc.

Explanation:

The biological role of luciferase lies in its quality as a catalyst for some types of bioluminescence. Bioluminescence is a type of chemiluminescence, it consists of the oxidation of luciferin, a luminescent substance, catalyzed by luciferase. Said reaction begins with luciferin whose carboxylic group reacts with the phosphate group of ATP, forming luciferyl adenylate. This molecule is oxidized (a process catalyzed by luciferase), resulting in an intermediate peroxide (luciferase-luciferin-AMP-O2 complex) which, upon releasing a molecule of carbon dioxide, results in a ketoderivative, the oxyluciferin, which is excited, returning to its normal state by releasing a photon of light:

Luciferin + O2 → Peroxidic intermediary (luciferase-luciferin-AMP-O2 complex) → [oxyluciferin] → oxyluciferin → light

Ksenya-84 [330]3 years ago
3 0

Answer:

Overall DeltaG = -6.40 kJ/mol

Delta G = 31.6 - 6.4 =25.2 KJ

T = 17 + 273.15 =290.15 K

Delta G = -RT * Ln (K)

25.2 * 10^3 J = -(8.314 J/moles*k)(290.15K) * Ln (K)

So (Delta G)/(-RT) = Ln (K)

Ln K = -10.44643114

Thus k = 2.905 *10^-5

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Hyperpolarization means that the ________. Group of answer choices membrane potential becomes more negative than the resting pot
gladu [14]

Answer:

Hyperpolarization means that the membrane potential becomes more negative than the resting potential.

Explanation:

The voltage across the membrane of a neuron that is at rest and not sending out signals is called the resting membrane potential, or just the resting potential. The concentration gradients of ions across the membrane and the amount of each type of ion that can pass through the membrane determine the resting potential. When a neuron is at rest, there are different levels of sodium and potassium on both sides of the cell membrane. Ions move down their gradients through channels. This creates a difference in charge, which gives rise to the resting potential.

When the membrane potential at a particular location on the neuron's membrane gets more negative, this phenomenon is known as hyperpolarization. Depolarization, on the other hand, occurs when the membrane potential becomes less negative (more positive). Both depolarization and hyperpolarization can take place as a result of the opening and closing of ion channels in the membrane, which changes the rate at which certain types of ions can enter or leave the cell.

<em />

<em>Your question is incomplete, but most probably your full question was </em><em>Hyperpolarization means that the membrane potential becomes  Group of answer choices </em>

<em>more negative than the resting potential </em>

<em>more positive than the resting potential</em>

Learn more abour hyperpolarization here:

brainly.com/question/12982897

#SPJ4

3 0
2 years ago
In the alternation of generations life cycle spores grow into gametophyte plants via a process called
den301095 [7]
Your answer would be A)Mitosis.
7 0
4 years ago
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what role does molecular evidence play in determining how closely two species are related to each other?
worty [1.4K]
The molecular technique is used to distinguish and evaluate the similarities and differences of the genomes of the various organisms of the same species. This method was first discovered by Charles Darwin when he did research in the Galapagos Islands. He was able to see the similarities and the difference between species depending on how they adapt to their physical environment.
5 0
3 years ago
How many grams of CaCl2 are needed to make3.5L (3500ml)<br> of a 15% calcium chloride solution?
madreJ [45]

Answer:

525 grams

Explanation:

Assuming the solution to be prepared is 15% by weight calcium chloride, it means 15 grams of calcium chloride will be in 100 mL of solution.

To calculate the amount needed to make 3500 mL solution;

15 g is required to make 100 mL

X g is required to make 3500 mL

X = 15 x 3500/100

          = 525 g

<em>Therefore, 525 grams of calcium chloride will be needed to make 15%, 3500 mL of calcium chloride solution.</em>

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4 years ago
In the above diagram of an animal cell<br>​
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It’s D-give the cell structural support, encloses the cytoplasm, and helps regulate what enters and exits the cell
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