In all plant and animal cells, the nucleus contains long molecules of dna. which of the following best describes the function of dna? a dna provides the shape and structure of the nucleus. b dna packages materials for transport through the nucleus. c dna carries materials into and out of the nucleus. d dna contains the blueprint for producing the whole organism.

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen

How many copies of genes do gametes have?

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.