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riadik2000 [5.3K]
4 years ago
5

Valence electrons are important because

Biology
1 answer:
agasfer [191]4 years ago
7 0

Answer:

A) They form chemical bonds with other atoms

Explanation:

In chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

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What is tonsillitis​
serious [3.7K]

Answer: inflammation of the tonsils.

Explanation:

Pretty much a sore throat

8 0
4 years ago
in humans, a combination of XX chromosomes results in a female zygote and that of XY result in a male zygotes. From whom does th
devlian [24]
The answer is: from mother

In a human diploid somatic cell (2n), there are<span> in total 46 chromosomes</span> - 22 autosomal chromosomes present in two copies and 1 pair of sex chromosomes. This means there are 23 pairs of chromosomes. In males, there is one X and one Y chromosome (XY) while in females, there are two XX chromosomes (XY).
During the formation of gametes, a female could give only X chromosomes, so gametes from the mother contain one X chromosome. But, a male could give X or Y chromosome, so gametes from the father contain either X or Y chromosome.
Female gamete and male gamete fuse to form a zygote. Male zygote must contain both X and Y chromosome. It inherits Y chromosome only from the father, so X chromosome must be inherited from the mother.
6 0
3 years ago
a. List two structures that are found in plant cells but are not found in animal cells. b. Provide the function (job) of each st
Lyrx [107]

Answer:

1. CELL WALL

2. CHLOROPLAST

Explanation:

1. Cell wall provide structural support and protection.

2. Chloroplast involved in photosynthesis to make glucose as food for plants cell.

7 0
3 years ago
45,46,47 <br> Please help
levacccp [35]

Answer:

66 55 and 34 welcome

Explanation:

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7 0
3 years ago
The pl promoter is derived from
alexandr402 [8]
You have to have both the pL promoter as well as a second system of the cI repressor which controls the pL promoter. 
When the cI repressor is expressed it will bind onto the operator region of the pL promoter and prevent expression. 
When the cI repressor is not expressed it can't bind to its operator and the pL promoter (which is very strong) can express whatever gene it is upstream of.
So you need to have both for transcriptional control. you don't need the rest of the phage!
4 0
4 years ago
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