NEED HELP ASAP: Which of the following describes DNA methylation?
A.) A mechanism involving attachment of methyl groups to certain bases to increase the rate of transcription.

B.) A mechanism involving attachment of methyl groups to certain bases to facilitate the binding of DNA to intermediate filaments.

C.) A mechanism involving attachment of methyl groups to certain bases leading to apoptosis.

D.) A mechanism involving attachment of methyl groups to certain bases for the long-term inactivation of genes during development.

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody

In sheep, the allele for belly fur (a) is dominant to the allele for no belly fur (a). a mother with the genotype aa and a father with the genotype aa produce an offspring.

Why are some places regularly warmer or cooler than others in a given month