Which of the following mechanisms of genetic transfer was first observed by Lederberg and Tatum (1946) in Escherichia coli?

A. Transformation
B. Transduction
C. Conjugation
D. All of the answers are correct


C

Biology & Microbiology

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Which of the following might explain the variation in this count from year to year?

a. annual weather conditions b. competition c. species diversity d. annual weather conditions and competition

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Which layer of the skin is composed of stratified squamous epithelium cells? a. Epidermis b. All of these choices have stratified squamous epithelium

c. Hypodermis d. Dermis e. None of these choices have stratified squamous epithelium.

Biology & Microbiology

Spherical bacteria that occur in clusters are ________

A) streptococci B) bacilli C) spirochetes D) staphylococci

Biology & Microbiology

Which kind of vessel has the lowest blood velocity?

A) artery B) capillary C) venule D) vein

Biology & Microbiology