Who was the first to observe "animalcules" under the microscope?
A. Antonie van Leeuwenhoek
B. Otzi the Iceman
C. Marcus Terentius Varro
D. Robert Koch
Ans: A. Antonie van Leeuwenhoek
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The prokaryotic chromosome is comprised of a ____
a. highly folded mass of a single, linear molecule of DNA b. loosely folded mass of a single, linear molecule of DNA c. highly folded mass of a double, circular molecule of DNA d. highly folded mass of a single, circular molecule of DNA e. loosely folded mass of a single, circular molecule of DNA
The aqueous humor ____
a. is in contact with the retina b. supports the lens c. is formed by the vitreous body d. is found between the choroid and retina e. bathes both sides of the lens
Recombinant DNA is associated with all of the following EXCEPT ____
a. genetic engineering b. new biological techniques c. restriction enzymes d. bacterial plasmids e. viral infections
A population of hummingbirds with a variety of beak sizes finds a new food source in a plant that has a long trumpet flower with nectar at the bottom of the trumpet. Over time, these hummingbirds develop longer beaks. This is an example of
A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.