Answer:
PCR amplify the DNA
Explanation:
O helium
hydrogen
Oxygen
Olithium
Answer:
Oxygen
Explanation:
The electrons present in an atom are arranged in shells or orbitals. The electrons are filled into these shells based on their energy levels with those shells closest to the nucleus filled first as they have the lowest energies.
The arrangement of electrons around the nucleus of an atom is known as electronic configuration. The outermost electron shell of an atom is known as a valence shell shell and the electrons found in this shell are known as valence electrons. The electrons usually exist in pairs. The first shell can only contain two electrons; the second shell can contain 8. the electrons are singly filled first before pairing occurs.
The electronic configuration of the atoms of the elements in the option are as follows:
Helium : 1s² ; valence electrons are 2 which are both paired
Hydrogen: 1s¹ ; valence electron is 1
Oxygen : 1s²2s²2p⁴ ; valence electrons are 6 wit two unpaired electrons
Lithium : 1s²2s¹ ; valence electron is 1
Helium has two valence electrons but they are paired as its 1s shell can only contain a maximum of two electrons.
Oxygen has 6 valence electrons. Two of these electrons are paired while the other two are unpaired.
There are many, and since you didn't specify the choices, some examples include "ff" or "dd" or just two lowercase letters.
Explanation:
This cell is getting ready to divide. The instructions to form another cell are inside the chromosome, which are found in the nucleus. The correct option is A.
The thread-like components known as chromosomes are found in the nucleus of both animal and plantcells. Protein and a single molecule of deoxyribonucleicacid make up each chromosome (DNA).
DNA is passed down from parents to children and contains the precise instructions that give each kind of living thing its individuality.
DNA may be precisely duplicated during these celldivisions thanks to chromosomes. So, once more. Our cells' nuclei include chromosomes, which enable precise DNA duplication during cell division. This guarantees that our internal processes go smoothly and effectively.
The cell is preparing to split into two. The chromosomes, which are located in the nucleus, contain the instructions for creating a newcell.
Thus, the correct option is A.
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Answer:
Bears, lions, and tigers all are predators that have similar hunting habits such as medium to large prey. Because of this, if they were living in the save environment, they would be competing for food and space. This would cause them to attack and kill off each other until one remained. That or the other two species would be driven out of the area.
Explanation:
irregular shaped object?
Answer:
d = 2 g/mL
Explanation:
Given that,
Water displaced by an object in a graduated cylinder, V = 25 mL
Mass of the object, m = 50 g
We need to find the density of this irregular shaped object. It is given by mass per unit volume. So,
So, the density of the object is 2 g/mL.