________ are strains that are unable to grow on a minimal medium that supports growth of the wild type strain, but are able to grow on the minimal medium if one or more nutritional supplements are added.
A. Auxotrophs
B. Prototrophs
C. Minitrophs
D. Autotrophs
Answer: A
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The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following
A) mitosis in her ovary B) metaphase I of one meiotic event C) telophase II of one meiotic event D) telophase I of one meiotic event E) either anaphase I or II
Which organism is nonhemolytic on 5% sheep blood agar but hemolytic on human blood?
a. Weissella confusa b. A. haemolyticum c. Lactobacillus spp. d. G. vaginalis
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.
Which of these are NOT embedded in the hydrophobic portion of the lipid bilayer at all?
A) transmembrane proteins B) integral proteins C) peripheral proteins D) All of these are embedded in the hydrophobic portion of the lipid bilayer.