If two different species of fish fossils were found in two different layers of sedimentary rock, what might one infer about the specimens?
A. The species in the higher layer evolved from the species in the lower layer.
B. The species in lower layer died first.
C. The species in the higher layer died first.
D. They died at the same time.
E. The two species are unrelated.
Answer: B
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Although the expression of most genes is tightly regulated, some genes are expressed at roughly constant rates. Which of the following genes would you predict to be constitutively (constantly) expressed?
A) genes involved in the biosynthesis of the amino acid tryptophan B) genes involved in the degradation of tryptophan C) genes involved in the degradation of arabinose, a sugar D) genes that code for regulatory proteins
Which of the following statements is not true concerning the fluid transported by the system depicted
in Figure 44-1? a. It accumulates in a blood cavity called a hemocoel. b. It is also called hemolymph. c. It can be found in grasshoppers. d. It has hemoglobin as the oxygen transporting pigment. e. It fills spaces called sinuses.
Which of the following groups is made up solely of carnivores?
a. insects b. flatworms c. arachnids d. mammals e. vertebrates
The synthesis of DNA or RNA from the organic soup would have been guided by the actions of enzymes in the
A. protein-first hypothesis. B. RNA-first hypothesis. C. clay-catalyst hypothesis. D. chloroplast.