The first eukaryotic fossils are dated to about ____.
A. 2.7 billion years ago
B. 1.8 billion years ago
C. 1.5 billion years ago
D. 750 million years ago
E. 201 million years ago
Answer: B
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All of the following pertain to glycolysis except
A. it degrades glucose to CO2 and H2O. B. it occurs without oxygen. C. it occurs during fermentation. D. it involves reduction of NAD. E. it ends with formation of pyruvic acid.
At the time of its discovery in 1938, the coelacanth was believed to have been extinct for 66 million years. Coelacanths are unusual fish by any measure; able to grow to the same size and weight as an adult human, live for fifty to sixty years, with eight lobed fins, an intracranial joint that allows it to open its jaw surprisingly wide, and a cranium filled with far more fatty tissue than brain, the coelacanth is frequently described as a living fossil, and reportedly tastes terrible. To which class does the coelacanth belong?
a. Myxini b. Petromyzontida c. Sarcopterygii d. Actinopterygii
Evolutionary biologists believe that females prefer attractive mates mainly because ____
a. attractive mates confer status in hierarchical societies b. attractiveness is a predictor of good performance and survivorship c. ornaments such as bright plumage stimulate her visual system d. superior ornaments deter rival males e. a sense of aesthetics is shared by both higher animals and humans
Which of the following is true of a species that has a chromosome number of 2n = 16?
A) The species is diploid with 32 chromosomes per cell. B) The species has 16 sets of chromosomes per cell. C) Each diploid cell has eight homologous pairs. D) A gamete from this species has four chromosomes.