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leonid [27]
4 years ago
8

Why are chromosomes not always visible?

Biology
1 answer:
taurus [48]4 years ago
3 0
Chromosomes sit around uncoiled and loose strands that are called chromatins when it's time for calls to reproduce they shrink and wrap tightly which then form DNA
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Plants require a lot of water for transpiration, metabolism, and photosynthesis. how is water used in photosynthesis?
kvv77 [185]

I think its condensation reaction


5 0
3 years ago
Uncontrolled cell growth in a person's body can restrict the normal functioning of the surrounding cells. This
MArishka [77]

Answer:

the uncontrolled growth of cells is known as cancer

5 0
3 years ago
The proportions of the bases are consistent within a species; however they do vary between species. Using the base-pair rules, c
Snezhnost [94]

Answer:

The correct answer would be:

                  A         G          C         T

Human:   31          19          19       31

Cow:         28         22      22         28

Salmon:     29       21       21         29

Wheat        27      23        23        27

Yeast         31         19       19         31

Explanation:

According to the rule of Chargaff which states or explains the amount of the A, T, G, and C bases in the DNA molecule. It says that the DNA of any organism should have a pyrimidine and purine ratio of 1:1. This means the amount of A would be equal to T and the amount G should be equal to the amount of C.

It also says that the amount of a and G would be equal to the amount of C and T. So on the base of this we can find the missing value in the table:

                    A         G          C         T

Human:   31          19          19       31   (A= T and G=C)

Cow:         28         22      22         28  (A= T and G=C)

Salmon:     29       21       21         29   (A= T and G=C)

Wheat        27      23        23        27 (100 - A+T = G+C)

Yeast         31         19       19         31 (A= T and G=C)

5 0
3 years ago
Please explain what hypertonic and hypotonic solutions are and the osmosis direction for each (into or out of cell)
gayaneshka [121]
A hypotonic solution<span> is one in which the concentration of solutes is greater inside the cell than outside of it, and a </span>hypertonic solution<span> is one where the concentration of solutes is greater outside the cell than inside it.

In Osmosis, direction is from Hypertonic to Hypotonic solution

Hope this helps!</span>
4 0
4 years ago
Which is a reason that many organisms that have existed in earth have left no fossils?
Lapatulllka [165]
Many of the organisms that had existed on the earth left no fossils because most of them can not meet the conditions that must be fulfilled before fossils can form. For fossils formation to occur, the organism soft tissue must decay leaving behind the hard part [majorly bone] in the sediment. Overtime, layers of sediment have to build up and pressed down on the buried remains. As time goes on, water and mineral seeped into the remains and form crystals.
4 0
3 years ago
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