In an atom, the number of protons always equals the number of
A. neutrons and protons.
B. neutrons.
C. neutrinos.
D. electrons.
E. quarks.
Answer: D
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Which of the following statements is true regarding Wolbachia bacteria?
A. Wolbachia co-evolved with insects. B. Wolbachia can selectively kill male insect embryos. C. Wolbachia can convey Dengue-resistance in insects. D. Wolbachia can affect the reproductive structures of its insect hosts. E. All of these statements about Wolbachia are true.
Growth factors cannot by synthesized by the bacteria that use them and include amino acids, pyrimidines, and vitamins.
Answer the following statement true (T) or false (F)
The half life of 14C is 5,730 years. If you test a fossilized bone and find that it has 1/8th the 14C as a modern bone, you could conclude that it is approximately _____ years old.
A. 5,730 × 2 = 11,460 B. 5,730 × 1 = 5,730 C. 5,730 × 8 = 42,960 D. 5,730 / 8 = 716 E. 5,730 × 3 = 17,190
A flock of birds with various beak sizes migrates to a new island where their traditional food is not available
However, there are plants that produce a variety of large nuts, which can be eaten by birds with the largest beaks, and plants that produce a variety of small, soft seeds, which can be eaten by birds with the smallest beaks. Over time, this population divides into two species with large and small beaks. This is an example of A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.