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marin [14]
3 years ago
15

The scales of female pine cones produce a sticky substance. what function might this serve?

Biology
1 answer:
NikAS [45]3 years ago
4 0
To protect the tree from harmful bugs, animals, or other predators.
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What percentage is Thymine:
kipiarov [429]
1. Is A
2 Is B
Because A and T in the DNA sequence goes together so they both have to have the same amount same goes for C and G
5 0
3 years ago
Why do the cells transformed with PUC18 and plasmid lux grow in the presence of ampicillin?
Fofino [41]

Answer:

The bacterial cells transformed with PUC18 and plasmid lux grow in the presence of ampicillin, because the DNA of bacterial cells had incorporated parts of plasmid DNA and became ampicillin resistant.

Explanation:

The bacteria showing this property is mainly known as Escherichia coli (E. coli). These bacteria cells generally shows no growth in presence of antibiotic like ampicillin. Whereas when these cells are treated with PUC 18 and plasmid lux, then the bacterial DNA undergo certain transformation due to incorporation of strands of DNA of plasmid into them. This transformation make them resistance to ampicillin, when they are cultured in agar media with ampicillin in it.

3 0
3 years ago
Electrons in the outermost energy level are usually involved in chemical reactions which are called ___________________ .
Elena-2011 [213]

Answer:

Chemical bonding

Explanation:

Outer most shell's electrons are called valence electrons and they are responsible for the formation of chemical bonds either ionic or covalent when atoms react with each other.

Outer most electrons hold immense importance in the type of chemical bonding an atom will go through in the formation of a molecule.

For example, sodium has only one electron in outermost shell so it is very hard for sodium to share electrons and become stable. Therefore, it never goes for covalent bonding but only goes for ionic bonding where it gives off one electron to another atom (say chlorine who has 7 electrons in outermost shell) and in this process sodium chloride is formed and both sodium and chlorine get stable electronic configuration.

Please see picture for better understanding. Therefore, we can say that  Electrons in the outermost energy level are usually involved in chemical reactions which are called chemical bonding or formation of chemical bonds.

Hope it help!


7 0
3 years ago
Discuss some of the trends in the periodic table; what they are, how each can be determined, and what each trend tells us about
chubhunter [2.5K]

Answer:Major trends are electronegativity, ionization energy, electron affinity, atomic radius, and metallic character. The existence of these trends is due to the similarity in atomic structure of the elements in their group families or periods and because of the periodic nature of elements

7 0
3 years ago
9. Which cell helps in gas exchange in plants?
Helga [31]

Answer:

Stomata

Explanation:

The stomata control gas exchange in the leaf. Each stoma can be open or closed, depending on how turgid its guard cells are. In the light, the guard cells absorb water by osmosis , become turgid and the stoma opens.

7 0
3 years ago
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