Which element is a major component of nucleic acids?phosphorous


Answer 1


NITROGEN calcium


because it would have an chemical overflow and not be there

Answer 2


nitrogen calcium


i took the tes

Related Questions

State 10 characteristics of class Mammalia​
Some Eukaryotic cells have internal structures that are able to use photosynthesis to convert light energy into chemical energy (as bonds in sugars). Why is this capability not found in all Eukaryotes?
Which is the correct chemical equation for photosynthesis? 6CO2 + 6H2O ® C6H12O6 + 6O2 C6H12O6 + 6O2 ® 6CO2 + 6H2O 3CO2 + 3H2O + 3O2® C6H12O6 6O2 + 6H2O ® C6H12O6 + 6CO2
Enzymes decrease the activation energy needed for a reaction.TrueFalse
What I Have LearnedDirections: Complete the statements in the paragraph by writing the appropriatewords in the box. Refer to the word box below. Write your answers in your scienceactivity notebook. the part where no. 13 is isn't shown so I'll just type it. Pollution in air, water and soil is the result of these changes, Eventually, causing harm and (13) ______ to living things. please kindly answer these. ​

Primary ciliary dyskinesia (PCD) is a rare genetic disease. Affected individuals exhibit impaired functioning of ciliated cells. Based on what you know about the role of cilia in eukaryotic cells, why would you expect people with PCD to be particularly susceptible to respiratory infections?



Cilia are motile in the lungs responsible for keeping the airways clear of dirt and mucus by their characteristic beating motion and rhythmic waving allowing a person to breathe easily and without irritation. These are present in both the lungs as well as middle ear.

As in Primary ciliary dyskinesia , there are defects in the action of cilia in the lining of the respiratory tract , middle ear , sinuses , eustachian tube etc the cilia cannot peforms its regular role .Infections can lead to an irreversible scarring and obstruction in the bronchi resulting in :

1) Shortness of breath.

2) Recurring chest colds.

3) Sinusitis.

4) Coughing , gagging , choking,

5)Middle ear infections

Answer: The respiratory wall or mucosa is made up of the epithelium and supporting lamina propria. The epithelium of respiratory tract is tall columnar pseudostratified with CILIA and goblet cells The cilia aids in sweeping away dusts and bacteria that adheres to the mucous on the epithelium. Therefore people with Primary ciliary dyskinesia are prone to Respiratory infections.

Explanation: Primary ciliary dyskinesia also called immotile ciliary syndrome is a rare genetic disease that affects the movement of cilia lining the respiratory tract. The major consequences of this dysfunction is reduced or absent mucus clearance from the lungs which subsequently leads to chronic recurrent respiratory infections

I hope this helps. Thanks!

14. Which of the following statements is/are correct? A. Most, if not all, members of Porifera are substrate feeders.
B. Members of Porifera lack endoderm and ectoderm
C. Sponges are a member of the phylum Cnidaria
D. Sponges do not reproduce by sexual reproduction and instead only reproduce asexually.
E. Given the following on the organism
I. An animal
II. Multicellular
III. Lacks tissues
IV. Lacks organs
V. Asymmetrical
This organism must be a member of the Phylum Porifera


Answer: Option E


Most of all poriferans/ sponges are suspension or filter feeders. Suspension feeders are organisms that each food materials which are suspended in their environment ie sea water, while filter feeders filter their food source from water by drawing water containing bacteria and organic matter in through their ostia(pores). Substrate feeders at organism that live in or on their food source.

Members of the poriferans do hava an ectoderm (epidermis) and an endoderm including a non-cellular late that is present in between the two layers.

No, they do not belong to the phylum cnidaria but porifera. Cnidarians including hydra, sex anemones, jellyfish etc and these have features that different from that of the sponges e.g the presence of nematocysts in cnidarians

Sponges can reproduce both sexually and asexually. Sexually by releasing larva fertilized in the sponge into water where they float around for some days and then proceed to adhere to a solid surface and begin their growth into adults. Asexually by budding

They are multicellular, lack tissues, are animals, lack organs and are asymmetrical. These are th distinguish features of poriferans

Answer: Option E.


Phylum porifera are group of organisms that live in aquatic habitats both marine and freshwater. They are diploblastic I.e they have two germ layers. They are assymetrical . They have round or vase-like or sac- like shape. They are multicellular and have bodies full of pores. They lack tissues and organs. Sponges are members of the phylum porifera.

Can water from all 4 oceans circulate because they are connected?


Answer: yes

Explanation: because they all connect

If there are 8 centromeres in metaphase, how many centromeres will be present in anaphase?A. 4B. 8C. 16D. 32





In a dividing cell, each chromosome consists of two chromatids. Both the chromatids remain attached at the centromeres. If in a dividing cell there are 8 centromeres, indicates that dividing cell has 8 chromosomes. Chromosomes separate during anaphase. The cell is still dividing and not separated into two daughter cells. Therefore, if the cell has 8 centromeres during metaphase, the same number of centromeres will be present during anaphase. Thus, 8 is the correct answer.

Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases in very specific ways. A segment of a DNA strand is shown. 3’ GATCGATC 5’

Which complementary DNA strand pairs correctly with the strand above?



Each base pair forms a "rung of the DNA ladder" by joining two complementary DNA nucleotide bases. Two linked strands of DNA form a double helix, which is a structure that resembles a twisted ladder.

What is complementary base pairing in DNA molecule?

Because they are complementary base pairs, adenine binds to thymine while guanine attaches to cytosine. The complimentary bases may unite to form a bond.

This aids in holding the DNA molecule's two antiparallel strands together to form the helix. The complimentary base pairing rule refers to this.

Cytosine pairs with guanine, while adenine pairs with thymine. The two strands are so complimentary to one another.

For instance, a complementary DNA strand will have the nucleotidesequence 5' CTAGCTAG 3' for a DNA strand with the nucleotide sequence 3' GATCGATC 5'.

Therefore, According to this rule, nucleotides A and T and bases G and C are always equally abundant in DNA.

Learn more about base pairing here:



A. 5’ CTAGCTAG 3’ because it’s asking for the complementary DNA not RNA

ater is prevented from entering the active site of glycogen phosphorylase. What are the advantages of excluding water from the active site? to prevent energy waste by conserving the ATP that would be needed to phosphorylate glucose to prevent the formation of glucose to prevent hydrolytic cleavage of glucose 1‑phosphate to prevent the unnecessary breakdown of glycogen to maintain energy supplies in muscle cells



The corect answer is to prevent unnecessary breakdown of glycogen.


The presence of water helps in the hydrolysis of energy rich componds and stored compounds inside the the body resulting in the generation of free energy and monomeric  subunits.

    The entry of water in the active site of glycogen phosphorylase result in the hydrolysis of glycogen to release glucose molecules from the later.

 But glycogen breakdown or glycogenolysis occurs during energy demand of our body and when there is enough energy in our body at that time there is no necessity to break down glycogen.

Other Questions