Chromosomes that look alike and carry the same sequence of genes for the same traits are
A. the X and Y chromosome.
B. all the autosomes.
C. homologous chromosomes.
D. found in females only.
E. found in males only.
C. homologous chromosomes.
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The type of defense in which plants produce chemicals that cause the uninfected cells around a site of infection to die, leading to isolation of the infected region, is called:
A. systemic acquired resistance. B. biotrophic defense. C. avirulent resistance. D. the hypersensitive response. E. the wilting response.
Why would the loss of helper T cells due to HIV infection result in the immunodeficiency associated with AIDS?
A. Helper T cells are central to the activation of other parts of the immune system. B. Helper T cells are normally present in higher numbers, so their loss reduces the total number of immune cells. C. Without helper T cells, plasma cells would not secrete antibody. D. Infection of the helper T cells could lead to infection and loss of progenitor cells, thereby eliminating all immune cells.
What are the most important transformers of energy in ecosystems?
A. detritivores B. plant and algae C. animals D. All of these choices are correct. E. None of these choices are correct.
A large molecule whose subunits consist of a sugar and a nitrogenous base is called a ____
a. nucleoside b. nucleotide c. nucleic acid d. nucleosome e. nuclear unit