When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is formed via a(n)
A. single covalent bond.
B. double covalent bond.
C. triple covalent bond.
D. ionic bond.
E. hydrogen bond.
B. double covalent bond.
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Which of the following effects may be mediated by transposable elements?
A. Genetic deletions may form. B. A mutation may result from insertion into a gene. C. Activation of nearby genes may occur. D. All of the choices are correct.
Meerkats are small desert mammals that live in groups of 20–50 animals. You observe a female meerkat who spends all of her time caring for the 1-year-old offspring of her sister (her nieces and nephews)
The aunt is capable of reproduction but has not reproduced. Which of the following would contribute to the evolution of this behavior pattern? A. The odds of any one female reproducing are completely random. B. Offspring require the efforts of a single adult (the mother) in order to be successful. C. Offspring require the efforts of at least two adults in order to be successful. D. Offspring are independent at the age of three months, with no adult care after that point.
anion or cation? potassium
What will be an ideal response?
According to Lamarck, the characteristics of
organisms change because of a. chance. b. an innate drive for perfection. c. extinction of competitors. d. special acts of creation. e. genetic mutation.