The satellite regions that distinguish chromosomes 13, 14, 15, 21, and 22 are
A) primarily euchromatin.
B) proteins that stabilize the chromosomes.
C) located near the centromere.
D) repeated genes that encode ribosomal RNAs and proteins.
D) repeated genes that encode ribosomal RNAs and proteins.
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Seagrasses are important in all the following except:
a. nutrient recycling. b. providing a habitat for animals. c. stabilizing sediments. d. being consumed by most estuarine herbivores.
What are plasmids?
A. Small, circular RNA molecules that contain many genes but that cannot be passed on to other bacteria B. Small, circular DNA molecules that contain just a few genes and that can be passed on to other bacteria C. Small, circular RNA molecules that contain just a few genes and that can be passed on to other bacteria D. Small, circular DNA molecules that contain just a few genes but that cannot be passed on to other bacteria
Answer the following statements true (T) or false (F)
1. The chance that a mutation will occur is independent of whether a new phenotype will benefit a population. 2. The hypothesis that birds are closely related to small dinosaurs called theropods began with the discovery of the fossilized skeleton of Archeopteryx. 3. Dinosaurs appeared, became diverse, and eventually became extinct during the Paleozoic era. 4. Earth's history spans about 4.5 billion years. 5. The abundant presence of ammonite fossils, corals, sponges, and crinoids in a large area indicates that the area was once part of an ocean.
RNA splicing involves the
A) addition of a nucleotide "cap" to the molecule. B) addition of a nucleotide "tail" to the molecule. C) removal of introns from the molecule. D) removal of exons from the molecule.