A trait unique to embryonic stem cells that makes them useful for generating knockout animals is that they

A) are totipotent.
B) can be grown in culture.
C) have been isolated from mice.
D) are extremely well characterized at the molecular level.


A) are totipotent.

Biology & Microbiology

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Before the development of photosynthesis and as ancient cells became crowded, there was probably a major competition for:

A) enzymes. B) water. C) oxygen gas. D) organic molecules.

Biology & Microbiology

The major focus of the clinical microbiologist is to rapidly isolate and identify microorganisms from clinical specimens.

Answer the following statement true (T) or false (F)

Biology & Microbiology

The famous “bell-shaped curve” that usually results

when test scores are plotted against number of students is an example of what type of selection? a. disruptive b. stabilizing c. divergent d. variable e. directional

Biology & Microbiology

A fundamental property of DNA's nitrogenous bases that is necessary for the double-stranded nature of its structure is ________

Fill in the blank(s) with correct word

Biology & Microbiology