Answer:
Carbon dioxide: Carbon dioxide is a molecule composed of one carbon atom bonded to two oxygen atoms via two double bonds. Carbon dioxide is a byproduct of exhaling and from the burning of fossil fuels. Its natural existence is in the form of a gas, which is inert and non harmful to humans in very low concentrations.
The body can defend itself from pathogens using white blood cells, the respiratory system, and digestive system. White blood cells fight against the pathogens by ingesting them. Certain white blood cells called lymphocytes produce antibodies that destroy pathogens by finding antigens, the foreign chemicals released by the pathogen. The respiratory system defends the body from pathogens each time you sneeze or cough. Cilia and mucus also protect the body by trapping dirt and other particles. The digestive system destroys pathogens with saliva, mucus, enzymes, and stomach acid.
Answer:
Explanation:
Gene expression is when information from a gene is used to product a gene product, this product enables to produce protein as the end product.
Phenotype which is the physical expression of the genetic make up gives the gene expression.
Cat having a fur pigmentation indicates the presence of a functional protein that has fur i.e the genetic make up of the cat has fur which give rise to the phenotypic expression.
Answer:
Male cones produce microspores.
Pollen grain contains cells that develop into sperm.
Explanation:
Gymnosperms are seed-bearing vascular plants. They produce cones and seeds to carry their reproductive structure. They produce both types of cones (male and female) for fertilization by making gametes. Male cones produce microspores to make pollen grains. Female cones give rise megaspores which produce ovules. Pollen grains spilt up to make sperm. One of these sperms fuse with egg cells for the fertilization.
Answer:
RNA Polymerase plays an important role in the process called transcription which result in the in the synthesis of RNA from DNA molecule.
Explanation:
RNA polymerase helps in the addition of ribonucleotides in the growing RNA strans that is synthesized from template DNA .
one ribonucleotide is joined to the adjacent ribonucleotide by the formation of phosphodiester bond.
RNA polymerase is named so because this enzyme helps in the polymerization of ribonucleotides leading to the formation of a Primary RNA transcript.
