The first animals to adapt to life on land were probably the
A. amphibians.
B. millipedes.
C. reptiles.
D. mammals.
B. millipedes.
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The genetic code was deciphered
A) in the year 2000, following several years of the human genome project. B) in the 1980s, as many Mendelian diseases had their genes identified. C) in the 1960s. D) in the 1950s.
Histones bond to DNA by ____ of DNA
a. an ionic attraction to the phosphate groups b. hydrogen bonding to the deoxyribose sugars c. an ionic attraction to the nitrogenous bases d. hydrogen bonding with the nitrogenous bases e. covalent bonds to the deoxyribose sugars
In a chemical reaction, if the reactants have more energy than the products, ____
a. there will be a net release of energy b. there will be a net loss of energy c. the activation energy will be very high d. the activation energy will be very low e. more bonds were made than were broken
Semen contains
a. sperm. b. the secretions of sex accessory glands. c. eggs. d. both a and b.