Answer:
Chromatin is a substance within a chromosome consisting of DNA and protein. The DNA carries the cell's genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus. Changes in chromatin structure are associated with DNA replication and gene expression.
Explanation:
c. Glucose and ATP are produced in glycolysis and used in fermentation.
Glycolysis is the process of breaking down glucose to produce energy. It generates two pyruvate molecules, ATP, NADH, and water. The process occurs in a cell's cytoplasm and does not require oxygen. It can be found in aerobic and anaerobic organisms.
Glycolysis is a cytoplasmic pathway that converts glucose into two three-carbon compounds while producing energy. Phosphorylation traps glucose with the help of the enzyme hexokinase.
Fermentation is a metabolic process that involves the action of enzymes to produce chemical changes in organic substrates. It is narrowly defined in biochemistry as the extraction of energy from carbohydrates in the absence of oxygen. Fermentation is an ancient method of food preservation. The method is still used today to make wine, cheese, sauerkraut, yogurt, and kombucha.
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Monoploid organisms reproduce asexually since they need to transmit all of their genetic material to their offspring. Diploid organisms, have 2 copies of their genetic material that differ slightly in their genes. Since the progeny gets half of the DNA from each parent, we have that new combinations can emerge; for example, if the mother is AA for some allele and the father aa, their offspring will be Aa, a new genotype. This might have different implications (for example, the recessive gene for thalassemia also provides resistance to malaria). Finally, during meiosis, there is also an event called crossover that increases the genetic variation of the offspring.
Answer:
Birds have remarkably specialized bones that are pneumatic, because they are full of air sacs that provide a continuous flow of breath throughout their bodies. In short, their lungs are essentially hooked up to their bones.