Scarlet fever is caused by strains of

A) Streptococcus agalactiae
B) Staphylococcus epidermidis
C) Staphylococcus aureus
D) Streptococcus pyogenes
E) Staphylococcus saprophyticus


D) Streptococcus pyogenes

Biology & Microbiology

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The thin flap of tissue that covers the opening of the vagina is called the hymen

Indicate whether the statement is true or false.

Biology & Microbiology

Photosynthetic organisms using the oxygenreleasing

pathway appeared on earth about ____ billion years ago.

a. 1.3 b. 1.8 c. 2.3 d. 2.7 e. 3.8

Biology & Microbiology

When is a test-cross used?

A. To determine the genes in a dominant organism B. To determine the genes in a codominant organism C. To determine the genes in a recessive organism

Biology & Microbiology

Refer to the accompanying figure. What is the process occurring in the cells labeled as 3 in the sequence?


a. mitosis
b. conjugation
c. the first meiotic division
d. exchange of micronucleus
e. the second meiotic division

Biology & Microbiology