Which of the following is a normal process of photosynthesis that could not occur if all reaction centers were inactivated by a toxin?
A. donation of excited electrons by chlorophyll a to a primary electron acceptor
B. absorption of photons by chlorophyll b
C. absorption of photons by carotenoids
D. donation of excited electrons by chlorophyll b to a primary electron acceptor

Answers

Answer 1

Answer:

A. donation of excited electrons by chlorophyll a to a primary electron acceptor

Explanation:

Photosystems are structures located at the thylakoid membrane that act to harvest energy light in order to convert it into chemical energy. Each photosystem is composed of a light-harvesting complex and a core complex, which in turn is composed of a reaction center. The photosynthetic reaction centers are multi-protein complexes that use light energy to catalyze the electron transfer across the chloroplast thylakoid membrane against a thermodynamic gradient. Moreover, antenna pigments are pigments that capture the energy from photons in order to transfer energy to other pigments in the photosystem (e.g., chlorophyll B and carotenes are antenna pigments, whereas chlorophyll A is the core pigment). Light energy absorbed by antenna pigments in the photosystems is transferred to the reaction center chlorophyll A molecules, thereby exiting electrons in the reaction center. A reaction center consists of two chlorophyll A molecules, which donate electrons to the primary electron acceptor.


Related Questions

During a stay in the hospital, an accident victim develops symptoms of bacteremia. A blood sample shows the presence of Gram-positive cocci in pairs. Lab tests determine that the bacteria are non-hemolytic and bile salt tolerant. The bacteremia is likely due to

Answers

Answer:

Enterococcus.

Explanation:

Enterococcus is reason for nosocomial infection with predilection for older patients with multiple comorbidities. It is usually caused by longer stay in hospital.  The infections may include urinary tract infections, wound infection and intra abdomen or pelvic infections.

Why is the alpine tundra important to protect

Answers

Answer: the tundra is important to protect is that it serves as a habitat for migratory populations, like waterfowl, shorebirds, caribou and several bear species. It is home to endangered animals such as the Arctic Fox, Polar Bear, Grizzly Bear, Caribou, and Musk Ox.

Explanation:

What are true of multicellular organisms

Answers

Answer:

hope this answer help you

Which of the following environments are low-level areas that can be temporarily or seasonally filled with water?

A. Rainforest
B. Swamp
C. Tundra
D. Wetland

Answers

I believe your answer will be D. Wetlands, as they have the capability to store flood waters during certain events temporarily.

its A, i took the test sorry for not anasewring at the right time of year, pardon me

Explain the characteristics scientists use when observing organisms and placing them in the six kingdoms .

Answers

Archaebacteria. Archaebacteria are the most recent addition to the kingdoms of organisms.
Eubacteria. Eubacteria are also single-celled bacterial organisms.
Fungi. The Fungi kingdom is recognizable to us as mushrooms, molds, mildews and yeasts.
Protista.
Plants.
Animals.

Mammals who have very short development period Inside their mothers body, followed by a second development period Inside a special pouch of the mother that is made of skin and hair are ____.

•monotremes
•placental
•marsupials
•amphibians

Answers

placental is the answer

q.no. 5 answer me please please please please please please please please please please please

Answers

Answer:

(a)The strength of natural fibers is very less as compared to synthetic fibers.  Natural fibers are heavy in weight.  Natural fibers can be damaged by moths and other insects.  These fibers are not wrinkle-free.  These fibers are not long lasting and hence not durable.

(b)  Cellulose is termed as polymer because it is made up of many monomer units.

(c) Rayon is first man- made fibre it is known as artificial silk because it have properties that are similar to silk.

(d) Rayon possesses many properties of natural fibers since it is a semi-synthetic fiber. Nylon is a synthetic fiber and has properties that are completely different from natural fibers. The key difference between rayon and nylon is their resistance to wrinkles and tears.

(e) Nylon has since become a popular choice, as it has excellent wind resistance, good elasticity, mildew resistance, and is comparatively cheaper. The material is also lightweight and dries quickly.

(f) When the piece of cotton is burnt then it burns completely and produces no odour or smell. When nylon is burnt, It completely burns and produces burning paper like odour. When nylon is burnt then the nylon is completely shrink and starts to melt first and then produces odour during the time of burning

If three plants grew to 20 cm, 25 cm and 15 cm, what would be the average height of the plants?

Answers

Answer:

20 cm

Explanation:

2. Slime moulds cannot be put neither in kingdom Plantae nor in kingdom Animalia. Give reason.

3. Give the disadvantages of the two kingdom classification.

Answers

Answer:

3. In the two-kingdom classification following are drawbacks:-

The plants comprised of photosynthetic and non-photosynthetic species. Fungi, that feed on dead organic matter, were placed under photosynthetic plants. There was another class of classification needed were the organisms with the same characteristics were clubbed into one kingdom. This system did not distinguish between the eukaryotes and prokaryotes, unicellular and multicellular organisms and photosynthetic (green algae) and non-photosynthetic (fungi) organisms. There are some organisms which neither fall into plant nor animal kingdom like Lichens.

Explanation:-

Hope my answer is helpful.. If yes, plz mark me as brainliest

what carbon compound stores energy for the cell and sometimes provides structural support

Answers

Answer:

Carbohydrates

Explanation:

Carbohydrates are a group of macromolecules that are a vital energy source for the cell, provide structural support to many organisms, and can be found on the surface of the cell as receptors or for cell recognition.

Answer:

Carbohydrates

Explanation:

pls help ill give brainlist!!!!!!!!!​

Answers

Answer:

Explanation:

Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).

A vacuole is a membrane-bound cell organelle. In animal cells, vacuoles are generally small and help sequester waste products. In plant cells, vacuoles help maintain water balance

Lysosomes function as the digestive system of the cell, serving both to degrade material taken up from outside the cell and to digest obsolete components of the cell itself

Centrioles play a role in organizing microtubules that serve as the cell's skeletal system. They help determine the locations of the nucleus and other organelles within the cell.

The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress. It also allows cells to develop turgor pressure, which is the pressure of the cell contents against the cell wall.

The cytoplasm is responsible for holding the components of the cell and protects them from damage. It stores the molecules required for cellular processes and is also responsible for giving the cell its shape.

What can differentiate between multiple layers of the ocean floor?

sonar

magnetic imaging

x-ray

seismic reflection

Answers

Explanation:

seismic reflection is the answer

The state of maintaining a stable internal environment regardless of changing external conditions is called
.

Answers

Answer:

homeostasis

Explanation:

Answer:

homeostasis

Explanation:

ik

help with this question 20pts ​

Answers

6 (A)=(x)sebaceous gland

please help me out, name all 3 parts of the atom. ​

Answers

1. Proton
2. Neutron
3. Electron

In the atom, the arrow 1 depicts the proton. The arrow 2 depicts the neutrons, and the arrow 3 depicts the electrons. All three of these are subatomic particles.

What is an atom?

An atom is the fundamental structural unit of matter. It consists of protons, neutrons, and electrons. Electrons are negatively charged particles that are present outermost shell of the atom, while protons are positively charged particles that make up the core of the atom. The neutron doesn't have any charge.

Both neutrons and protons make up the core of an atom, while electrons revolve around them. A neutral atom has equal numbers of protons and electrons. Example: the sodium atom.

Hence, the atom showing arrow 1 is a proton, arrow 2 is a neutron, and arrow 3 is an electron.

To learn more about atom, refer the following link,

https://brainly.com/question/20895884

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The consensus is that the coelacanths and lungfishes (Sarcopterygii) represent an evolutionary link between ray-finned fishes and tetrapods. What is the major feature in the Sarcopterygii that supports this hypothesis?

Answers

Answer:

Choana, paired fins with a fleshy base over a bony skeleton, persisting notochord, 2 dorsal fins and nares.

Explanation:

Sarcopterygii also known as lobe-finned fishes which usually possess a choana, paired fins with a fleshy base over a bony skeleton, persisting notochord, 2 dorsal fins and nares are present internally. The lungfishes are considered the closest living relatives of tetrapods because of the presence of some common features. The African lungfish has epithelial crypts located at the base of the lamellae of the olfactory epithelium that express markers of the vomeronasal receptors in tetrapods.

Both mitochondria and chloroplast have about the same function as…


. animal cells.

. eukaryotic cells.

. prokaryotic cells.

Answers

Answer:

Prokaryotic cells.

Hope this helps :)


If a scientific journal article is difficult to understand in its entirety, what is the best resource for comprehending the overall study
and results?

Answers

Answer:B an abstract of the study

Explanation:

Why was the scientific method developed?
Group of answer choices

to help scientists avoid religious disputes

to help scientists organize the process of solving problems

to confirm ancient facts about the Earth

to develop scientific laws that no one could argue with

Answers

Answer:

Its B

Explanation:

It just is

mark brainliest

The raw material used by plants during photosynthesis N2and O2 O2,H2 and CO2 CO2 and water water and minerals​

Answers

Answer:

Thus, the correct answer is 'Carbon dioxide, water, and sunlight'.

Identify a global challenge

Answers

Answer:

electrical waste management and deforestation

How you complete this

Answers

Answer:

Hi. Can you type the question, it's a bit confused reading it like this thank you!.

A population of birds can have large, heavy beaks or thin, long beaks.

What can we say based on this data?
Select one:

We cannot conclude anything without having more data.

Having heavier beaks is a survival advantage.


Having longer beaks is a slight survival advantage, but having more data would help to confirm.
undo

There is no survival advantage between having heavier beaks and longer beaks.

Answers

Answer:

We cannot conclude anything without having more data.

Explanation:

All the statement says it that the birds have different types of beaks. There is no mention of information that the beak difference brings advantage or not. If the question were to say the heavy beaks survive more, then the answer would be those birds have an advantage- because it does not, the answer is we need more data

An experimental herbicide kills plants by blocking the ATP synthase in thylakoids. This is most likely to: Group of answer choices Decrease the pumping of NADPH across the thylakoid membrane Increase the pH of the chloroplast stroma Decrease of flow of electrons from photosystem II to photosystem I Decrease the concentration of ATP in the thylakoid space

Answers

Answer:

Decrease the pumping of NADPH across the thylakoid membrane

Decrease of flow of electrons from photosystem II to photosystem I

Explanation:

Thylakoids are defined as a membrane-bound compartments located inside the chloroplasts and the cyanobacteria. Here, light-dependent reactions of photosynthesis occurs.

To block the photosynthesis process, the herbicides pushes the dichlorophenyl dimethylurea to block the electron flow through the photosynthesis II and it reduces the flow of electrons from photosystem II to photosystem I. It also decreases pumping of the NADPH across the thylakoid membrane.

Which of the following cell membranes is the most fluid?

Membrane A, because it is composed of saturated fatty acids that have one or more cis bonds that form stable aggregations

Membrane A, because it is composed of saturated fatty acids that lack weak hydrogen bonds that continually break and reform to permit macromolecule movement

Membrane B, because is it composed of unsaturated fatty acids that form weak covalent bonds at the site of their cis bonds, which permit easy movement

Membrane B, because it is composed of unsaturated fatty acids that have one or more bends, which prevent tight packing

Answers

Answer:

Membrane B, because it is composed of unsaturated fatty acids that have one or more bends, which prevent tight packing.

Which hair is Is constitute about two third of the hair of women , one tenth of the hair of men, and all of the hair of children?

Answers

Answer:

vellus

Explanation:

The villus hair is also called as the peach fuzz refers to a fine thin and light-colored hair. It covers the majority of body parts such as face, stomach, legs and arms. This hair tends to be very short and has a length of 2mm.

See the image below!

Answers

Answer:

it is cytosine part of deoxyribonucleic acid

Genetic diversity is associated with asexual reproduction.
True
False

Answers

Answer:

i think its false

Explanation:

Answer:

in asexual reproduction you do not really get genetic diversity, therefore this is false.

Use an examples to distinguish dominant and recessive phenotypes.
I'm a bit stuck and need some help. Much appreciated!

Answers

Think recessive phenotypes as paper and dominant phenotypes as teared paper. Once paper is teared, it can't be fixed. Not even tape. It'll just leave that mess exposed. Same with dominant phenotypes. It just takes one dominant trait to change the looks of future offspring.

If you don't tear the paper, everything is fine. Same with recessive phenotypes. As long as there's no contact with any dominant phenotypes, the looks of future offspring will change.

The liver and pancreas are both human body organs. Which of the following correctly compares the two organs?

The liver produces digestive juices, while the pancreas helps break down fats.
The liver makes insulin, while the pancreas helps digest fats.
The liver produces bile, while the pancreas controls the level of sugar in the blood.
The liver filters and cleans the blood, while the pancreas produces bile.

Answers

Answer:

Awnser is a

Explanation:

Im from flvs

Answer:

The liver produces digestive juices, while the pancreas helps break down fats.

Explanation:

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