What is a major predator of giant squids?
a. Sperm whales
b. Orca
c. Beaked whales
d. Pilot whales
a
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The term "2n" means
a. the diploid chromosome number is present. b. the haploid chromosome number is present. c. chromosomes within a single nucleus exist in homologous pairs. d. both a and c.
All of the following are factors in enzyme-catalyzed
reactions that work alone or in combination to lower the activation energy EXCEPT a. helping substrates get together. b. orienting substrates in positions favoring reaction. c. using ATP as an energy source. d. shutting out water molecules. e. inducing a fit between enzyme and substrate.
The last mass extinction of dinosaurs on Earth
occurred between which two geologic periods? a. Devonian and Carboniferous b. Silurian and Devonian c. Triassic and Permian d. Cretaceous and Tertiary e. Jurassic and Cretaceous
Which of these eye structures is responsible for allowing a person to see color?
A) cones B) rods C) sclera D) incus