Which of the following characteristics is present in all chordates? 

A. gills
B. notochord
C. vertebrae
D. All of the above are correct.


B. notochord

Biology & Microbiology

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The area around a nucleus where an electron is most likely to be found is the:

A. electrical space. B. energy level. C. polar space. D. orbital.

Biology & Microbiology

Hairlessness in dogs is inherited from a single dominant allele. Inheriting two dominant alleles is lethal for an embryo. Ralph and Penelope are both hairless dogs. What is the probability that Penelope will give birth to a puppy with hair?

A) 3/4 B) 1/3 C) 2/3 D) 1/4

Biology & Microbiology

Which of the following can result in instant speciation?

a. development of a physical barrier b. polyploidy c. increase in physical size d. change in environmental conditions e. the introduction of a new predator into an area

Biology & Microbiology

In addition to showing that DNA carries genetic information, the experiments of Avery, McCleod, and McCarty demonstrated that:

A: DNA is present in bacteriophage. B: DNA may be taken up by bacterial cells and be active. C: DNA is a double helix. D: DNA binds to the cell wall of the bacterium. E: eukaryotic cells may be genetically transformed.

Biology & Microbiology