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Snezhnost [94]
3 years ago
5

Using a microscope in the science lab, Jill observed two unknown cell: Cell

Biology
1 answer:
natali 33 [55]3 years ago
3 0
Answer:
B. Cell 1 had a cell wall and cell 2 did not

Explanation:
Why A,C and D is wrong:

A: Both plant cells and animal cells have cell membrane

C: Plant cell (cell1) had a chloroplast and animal cell (cell2) did not

D: Both plant cells and animal cells have nucleus
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Now that you have identified the components of DNA, can you describe how these components bind together to form a DNA molecule?
omeli [17]

The question is incomplete. The complete question is attached below.

Answer:

1. DNA is the polymer of deoxyribonucleotides that contain the nitrogenous base, pentose sugar and phosphate group. The phosphate is attached with the 3 C position of the deoxyribose sugar. This leads to teh formation of phosphodiester bond.

2. The DNA backbone consists of phosphate and sugar. The nitrogenous bases are inserted inside the DNA molecule. These nitrogenous bases are linked together by the hydrogen bonds.

3. The adenine binds requires two hydrogen bonds to bind with thymine. This provide complementary nature to the DNA molecule. Uracil is present instead of thymine in RNA .

4. The guanine binds requires three hydrogen bonds to bind with cytosine. More amount of energy is required to break their bonds.

8 0
3 years ago
When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited.
lys-0071 [83]
<h2>Answer:</h2>

a. one allele from each parent

<h2>Explanation:</h2>

An allele in biological sciences is one of the possible forms of a gene that it can inherit. Most genes have two alleles, a dominant allele and a recessive allele. When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited an allele for tallness from the tall parent and an allele for shortness from the short parent.

7 0
3 years ago
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When the body becomes dehydrated, a chemical signal is sent that causes nephrons in the kidneys to absorb more water and excrete
Rama09 [41]
Feedback loop. Hope this helps! :)
4 0
3 years ago
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PLEASE HELP WILL MARK BRAINLEST
STatiana [176]

Answer: genetics and mutation generate some of the variety that natural selection acts on

Explanation:

3 0
3 years ago
Frogs have lungs for breathing, but they also absorb dissolved oxygen directly through their skin. This allows respiration to oc
alukav5142 [94]

Answer: B. Water breaks down into oxygen molecules for respiration.  


Water is the required for photosynthesis, a process by which plants (terrestrial and aquatic) makes their food by utilizing water as a reactant to produce oxygen and glucose as product. The glucose act as a source of energy for conducting various metabolic processes in plants but oxygen is released in the air.

6CO_2\ \ \ \ +6H_2O\rightarrow\ C_6H_{12}O_6+6O_2\\carbon\ \ \ \ water\ \ \ \ \ \ \ \ glucose\ \ \ \ \ \ \ oxygen\\ dioxide

This oxygen is necessary for terrestrial and aquatic animals for respiration. Therefore, water breaks down into oxygen by the process of photosynthesis, hence water plays important role in respiration in living beings.  


5 0
3 years ago
Read 2 more answers
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