1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sergeeva-Olga [200]
3 years ago
13

Explain how activation energy is related to exothermic and endothermic reactions.

Biology
1 answer:
Paul [167]3 years ago
4 0

Explanation:

Some chemical reactions need a constant input of energy to take place. They are called endothermic reactions. ... From the graphs, you can see that both types of reactions need the same amount of activation energy in order to get started. Only after it starts does the exothermic reaction produce more energy than it uses.

You might be interested in
If a pendulum makes exactly 60 oscillations in 15 seconds, then<br> its period is
Naddika [18.5K]

Answer:

=60÷15

=4 oscillations

3 0
3 years ago
Read 2 more answers
-
fiasKO [112]

Explanation:

-Pheophytin

P680 the primary donor of Photosystem II becomes excited and transfers an electron to pheophytin. Pheophytin is the initial intermediate electron acceptor and carrier in Photosystem II; it is a chlorophyll-like molecule that lacks a central magnesium ion.

Further Explanation:

Photosynthesis is a chemical pathway that’s integral to producing energy in plants and other primary producers. Energy in the form of molecules of glucose is produced from light, water and carbon dioxide while oxygen is released. This occurs in several complex steps, photosynthesis is a rate limited reaction, depends on several factors including carbon dioxide concentration, ambient temperature and light intensity; the energy is retrieved from photons, I.e. particles of light, and water is used as a reducing agent. This occurs in the thykaloids, where pigment molecules like chlorophyll reside.

The chloroplast is a membrane bound organelle found in plants. It contains several invaginations of a plasma membrane called the thylakoid membrane. This contains chlorophyll pigments, in stacks called granum, while the internal spaces of the organelle are called the lumen. Liquid surrounds the granum, forming the stroma.

During the light reaction:

  • Light is absorbed by pigments in phosystem II (PSII). This energy is transferred among pigments til it gets to the reaction center, and is transferred to P680; this promotes an electron to a higher energy level where it then goes to an acceptor molecule, like Pheophytin .
  • Water supplies the chlorophyll in plant cell with replacement electrons for the ones removed from photosystem II. Additionally, water (H2O) split by light during photolysis into H+ and OH- acts as a source of oxygen along with functioning as a reducing agent.
  • the electron moves down an electron transport chain (to PS I)where it experiences continuous energy loss. This energy fuels the pumping of H+ from the stroma to thykaloid, leading to the formation of a gradient. The H+ move along their gradient and cross through ATP synthase, into the the stroma.
  • ATP synthase converts ADP and Pi to the energy storage molecule ATP.
  • The electron gets to photosystem I where it goes to pigments at P700. It absorbs light energy, the electron is promoted to a higher energy level, and passed to an electron acceptor. This leaves a space for another electron which is then replaced by one from photosystem II.
  • in the ETC, the molecule NADP is reduced to NADPH by providing H+ ions. NADP and NADPH are integral to the Calvin cycle where monosaccharides or sugars like glucose are produced after the modification of several molecules.

Learn more about Photosynthesis at brainly.com/question/4216541

Learn more about cellular life at brainly.com/question/11259903

#LearnWithBrainly

8 0
3 years ago
Why (DNA) that i distracted from the strawberry doesn't look like double helix
Leno4ka [110]
This was because one cannot view a single strain of DNA as it is too small for one to visually comprehend.
4 0
3 years ago
To test a new drug that has the potential of curing people of the common cold, a company asked human volunteers who were coughin
MAVERICK [17]

Answer: To help researchers conclude that results are related to the new drug and not to the orange juice.

Explanation:

I could be wrong, Hope this helps

7 0
3 years ago
Read 2 more answers
True or False<br><br>A hypothesis can be described as a possible proof.
juin [17]
<span>it is false.</span> it can't because it a guest so no.
 
7 0
3 years ago
Other questions:
  • Infantile characteristics, such as _________, tend to be very appealing to humans and other species that invest heavily in the r
    7·1 answer
  • Share 3-5 different reasons people may eat food beyond the need for nutrients. For example, you could describe the role of food
    7·1 answer
  • which of the following statements about scientific theories are true? (A) theories cannot be tested (B) theories are the same as
    7·1 answer
  • While conducting an investigation, you observe that exposing inner mitochondrial membranes to ultrasonic vibrations disrupts the
    12·1 answer
  • What caused Antarctica’s climate to change from a more temperate climate to its current climate? a. movement of tectonic plates
    9·2 answers
  • Explain how an unbalanced translocation occurs and how it affects humans.
    13·2 answers
  • Which atmospheric layer is least dense
    7·1 answer
  • A student properly flames her loop but then forgets to let it cool. Instead, she immediately inserts the hot loop into her broth
    15·1 answer
  • HELP PLEASE !!!!
    10·1 answer
  • How is colorblindness inherited? Explain
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!