The DNA double helix is held together by (covalent/ionic/hydrogen) bonds.
Fill in the blank(s) with the appropriate word(s).
hydrogen
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In conifers, microspores develop into:
A. flagellated sperm B. pollen grains C. ovules D. a nucellus E. male cones
Individuals with ____________________ are extremely sensitive to sunlight and develop skin cancer at a rate 1000 times above normal
Fill in the blank(s) with correct word
According to the biological species concept, the evolution of reproductive barriers is the key to the origin of new species.
a. true b. false
Imaginal discs are:a
found in mammalian cells and control gene activation in mature somatic cells. b. paired groups of undifferentiated cells that are precursors of adult structures in Drosophila. c. found in plant cells and assist in the development of the flower. d. part of the salivary gland of Drosophila. e. found in Drosophila ovary cells and represent inactivated X chromosomes.