Answer:
Sample A: 21.3%A, 28.7% G and 28.7% C
Sample B: 27.7% A, 22.3% G and 22.3% C
Explanation:
According to Chargaff's rules of base pairing, the amount of adenine in a DNA molecule equals the amount of thymine, and the amount of G=C.
Sample A
Contains 21.3% T, so it also contains 21.3% A. Therefore A+T= 42.6%
100% - (A+T) = (G+C)
100% - 42.6% = 57.4%
G+C add up to 57.4% of the DNA in sample A. And because G=C, there's 28.7% G and 28.7% C.
Sample B
Contains 27.7% T, so it also contains 27.7% A. Therefore A+T= 55.4%
100% - 55.4% = 44.6%
G+C add up to 44.6% of the DNA in sample B.
And G=C, so there's 22.3% G and 22.3% C.
Answer:
The polar nature of water make water universal solvent.
Explanation:
The polar nature of water is responsible for the versatility as a solvent because due to this polar nature of water maximum number of solutes or chemicals dissolved in it and it is also called universal solvent. Polar nature means making positive and negative polar which attracts the opposite charge atoms and making covalent bond with them. The hydrogen has partial positive charge so it attracts negative charge atom while oxygen has partial negative charge so it attracts positive charge atom.
Water's versatility as a solvent can be attributed to its polarity, hydrogen bonding, and high dielectric constant.
Water's versatility as a solvent can be attributed to several factors:
Polarity:
Water is a polar molecule, meaning it has a slightly positive end and a slightly negative end. This allows water to dissolve many different substances that have charged or polar molecules, like salts and sugars.
Hydrogen Bonding:
Water can form hydrogen bonds with other molecules. This allows it to dissolve substances that can form hydrogen bonds with water, such as alcohols and organic acids.
High Dielectric Constant:
The dielectric constant of water is relatively high, which means it can weaken intermolecular forces between solute particles and allow them to dissolve more easily.
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> roots and chloroplasts
> phloem and roots
> cuticle and stomata
> stomata and phloem
Cuticle and stomata in plants have a similar function to skin.
The cuticle is well known for its functions as a diffusion barrier limiting water and solute transport across the apoplast and for its protection of the plant against chemical and mechanical damage, as well as pest and pathogen attack.
In some higher plants, the cuticle is a water-impervious protective layer covering the epidermal cells of leaves and other parts and limiting water loss. It consists of cutin, a waxy, water-repellent substance allied to suberin, which is found in the cell walls of corky tissue.
The cuticle itself comprises three layers: the cuticular layer; cuticle proper; and epicuticular waxes. The cuticular layer is the innermost layer, which overlays the primary wall and consists of cellulose and other polysaccharides along with cutin and wax.
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Answer:
c
Explanation:
Answer:
To view prokaryotes with the compound microscope, you must use an oil-immersion lens (100x objective).
b. parasympathetic motor division
c. sympathetic sensory division
d. parasympathetic sensory division
Answer:
i believe its c
Explanation:
A single sympathetic preganglionic fiber has many axon collaterals and may synapse with 20 or more postganglionic neurons.
The postganglionic axons typically terminate in several visceral effectors and therefore the effects of sympathetic stimulation are more widespread than the effects of parasympathetic stimulation.