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3 years ago

Where do the electrons entering photosystem ii come from?

1 answer:

8 0

In photosystem ║, the chlorophyll molecules releases 2 energized electrons; the electrons are placed by 2 electrons from a water molecule,forms oxygen gas (o2) and 2 hydrogen ions.

Explanation:

Photosystem ║is the protein complex in the light dependent reactions of oxygenic reactions of photosynthesis. The energized ions are replaced by oxidizing water to form hydrogen ions and molecular oxygen.

During photosystem ║, light strikes a photosynthetic pigment, the absorbed energy bounces to the chlorophyll molecules in the reaction center, it releases two energized electrons, the electrons are placed by two electrons stripped from a water molecule, forming oxygen gas(02) and 2 hydrogen ions.

The energized electrons are transferred to plastoquinone and are used to reduce NADPH are used in non- cyclic electron flow.

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A hydrogen fuel cell is more efficient than a combustion reaction because very little of released energy as ___________ (Heat, e

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Heat (06.01)<span>The probability that an event will occur is 100%. Which of these best describes the likelihood of the event occurring</span>

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3 years ago

Sandra Bem coined the term _____ to describe those people who possess both masculine, or instrumental, and feminine, or expressi

son4ous [18]

Answer:

Hello!

The answer is androgyny.

Explanation:

Sandra Bem was a psychologist who studied gender and gender roles.
She is famously known for introducing the Gender Schema Theory and the Bem Sex-Role Inventory or BSRI which is a test that classifies individuals on the basis of male and female traits.
Bem's work has helped to redefine gender roles in society.
Bem stated that each individual has both masculine and feminine traits and their gender roles could be determined on the basis of score on the BSRI.
She introduced the androgyny to define people who have an equal number of both masculine and feminine traits on the BSRI.

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3 years ago

4. Which of the following statements best describes how the traits of an organism are determined

butalik [34]

Answer Choices:

DNA provides the energy needed for an organism to grow and function

DNA is copied into mRNA, which controls cellular functions

DNA codes for proteins, which allow an organism to grow and function

DNA unzips and each strand codes for a different amino acid

Answer:

DNA codes for proteins, which allow an organism to grow and function

Explanation:

DNA provides the energy needed for an organism to grow and function - this is false. DNA does not provide energy. A molecule called ATP, mostly produced by cellular respiration, provides energy for the cells to grow and function.

DNA is copied into mRNA, which controls cellular functions - this is false. While it is true that DNA is copied into mRNA, mRNA does not directly control cellular functions. Instead, mRNA is translated into proteins.

DNA codes for proteins, which allow an organism to grow and function - <u>this is true, as indicated above, DNA is transcribed to mRNA which is translated into proteins. Proteins carry out essentially all the functions in the cell</u>

DNA unzips and each strand codes for a different amino acid - this is false, DNA is transcribed into mRNA. Each mRNA codon (three bases) codes for a different amino acid

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3 years ago

A scientist was studying bones from an individual who died thousands of years ago. Which portion of the bones was the scientist

ludmilkaskok [199]

Answer: Minerals

Explanation: The body decomposes and after about 40 to 50 years bones are mostly brittle and dry with no traces of flesh. After thousands of years bones also disintegrate (decay) leaving brittle mineral frame. The life of bones is determined by the soil type its buried in, nuetral soils takes longer then acidic soil condition.

In this case osteocytes(bone cells) are the first to decompose followed by the cartilage and bone marrow, leaving behind mineral traces that scientist can study after thousand years.

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3 years ago

Read 2 more answers

An enzyme that breaks DNA, dispels the tension, and reseals the strand ahead of a DNA replication growing fork is called a(n):

qaws [65]

Answer:

Topoisomerase

Explanation:

Topoisomerases are enzymes that produce changes in the topology of the DNA during replication, transcription, traduction, or reparation processes. They can cut one or both strands and in order to relieve torsional stresses in the supercoiled structure of DNA. With this, they help to maintain the chromosome's integrity. There are two types of topoisomerases: topoisomerase I (it cuts only one strand of DNA) and topoisomerase II (it is able to cut both strands of DNA).

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3 years ago