Which of the following methods would NOT
result in identical twin organisms?
a. asexual reproduction
b. embryo splitting
c. reproductive cloning
d. somatic cell nuclear transfer
e. two separate eggs fertilized by two separate
sperm
E
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The steps of DNA replication and the enzymes involved are largely conserved amongst bacteria, archaea, and
eukaryotes. How can this evolutionary conservation be explained?
What will be an ideal response?The production of sex hormones in humans increases ____
a. during fetal development b. during teenage years c. during pregnancy d. at puberty e. at birth
Which of the following statements are fundamental to the clonal-selection theory of how the adaptive immune system functions? I) Each lymphocyte has a unique membrane receptor that recognizes one antigen
II) When the lymphocyte binds an antigen, it is activated and begins dividing to form many identical copies of itself. III) Cloned lymphocytes have slight differences and are selected by the spleen for removal if they do not bind an antigen. IV) Cloned cells descend from an activated lymphocyte and persist even after the pathogen is eliminated. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV
Which of the following are characteristic of both rhizobia and mycorrhizae?
I) They both benefit by receiving sugars from the plant. II) They both become parasitic in nutrient-rich environments. III) They both enhance the growth of most plants. IV) They both are found in most ecosystems of the world. A) only I and II B) only I, III, and IV C) only III and IV D) I, II, III, and IV