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Black_prince [1.1K]
4 years ago
5

What is Photosynthesis' product and reactant??

Biology
1 answer:
Lelechka [254]4 years ago
3 0
Reactant carbon dioxide and water
Product glucose and oxygen

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​ In the light-dependent reactions of photosynthesis, how do hydrogen ions get back into the stroma?
Alika [10]

Answer:

In the light-dependent reactions, water molecules do not give up electrons easily so the hydrogen ions remain in the thylakoid compartment. The movement of the hydrogen ions back to the stroma is due to the gradient.  

The hydrogen ions have energy as they flow down the gradient that takes place due to the chemiosmosis process, oxygen combines and flows or diffuse.

5 0
3 years ago
Which of the following statements regarding restriction enzymes is NOT true?
Anni [7]

Answer:

The correct option is option A

Explanation:

Restriction enzymes are endocleases that cleave DNA fragment (<u>of usually four, five or six nucleotide long</u>) at <u>specific sites to produce blunt or sticky ends</u>. They <u>recognize palindromic sequences of host DNA when cleaving the specific sites</u>. The sequences below (on complementary strands) give an example of a palindromic sequences.

5'-CCC║GGG-3'

3'-GGG║CCC-5'

As can be seen above, when read from 5' to 3', the two sequences are the same despite being on opposing strands. And when cut between the guanine (G) and cytosine (C) (as shown above), it produces a blunt end. But when cut as shown below produces a sticky end.

5'- G║AATTC -3'

3'- CTTAA║G -5'

The explanation above shows options C and D are right while option A is wrong (hence the correct option).

Also, bacteria prevent their own DNA from been digested by restriction enzymes by adding methyl group to their restriction sites <u>which prevents restriction enzymes from recognizing restriction sites of their DNA;</u> this generally makes bacterial DNA to be highly methylated. This explanation makes option B right also.

6 0
3 years ago
What causes dark circles and bags under eyes?
IRINA_888 [86]
Certain medication could cause the blood vessels in your eyes to dilate. Also lack of sleep and sleeping on your stomach can also cause this.   <span />
3 0
3 years ago
Which of the following characteristics are associated with transformed cells? Check All That Apply decreased growth ratedecrease
castortr0y [4]

Answer:

b. Altered chromosomes.

c. Changes in cell surface molecules.

e. Integration of viral deoxyribonucleic acid (DNA) into host chromosome.

Explanation:

A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.

A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.

Generally, cells have the ability to independently replicate themselves.

In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles. Some examples of cell organelles found in all living organisms such as trees, birds, and bacteria include; nucleus, cytoplasm, cell membrane, golgi apparatus, mitochondria, lysosomes, ribosomes, chromosomes, endoplasmic reticulum, vesicles, etc.

Transformed cells refer to cells that have undergone genetic alterations and as such do not experience normal cell processes or characteristics such as differentiation, division, and growth.

The characteristics which are typically associated with transformed cells include the following;

I. Altered chromosomes. Chromosomes are found in the cell nucleus and are comprised of deoxyribonucleic acid (DNA), histone proteins, etc. Thus, they are used to store genetic informations in living organisms.

II. Changes in cell surface molecules.

III. Integration of viral deoxyribonucleic acid (DNA) into host chromosome.

8 0
3 years ago
The relationships between a community of plants and animals and their environment are known as a(n) _____. food chain food web e
yanalaym [24]

Answer:

The answer is ecosystem!

I like to think of an ecosystem as a web. Webs spun by spiders are often very intricate and unique. If you were to cut out a piece of a web you would lose the overall stability. JUST like a ecosystem. Ecosystems are very fragile yet beautiful and unique!

I hope this helps!

p.s. have any more questions? Post the question and comment the link below!

Ciao!

♥, Sadie  

5 0
3 years ago
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