What significant event occurred during the Cambrian explosion in Earth's history?

A) life first appeared
B) eukaryotes first appeared
C) plants first appeared
D) multicellular animals first appeared


D

Biology & Microbiology

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Which one of the following proteins is not required at low, basal levels for the regulation of the expression of the lac operon?

A. thiogalactoside transacetylase B. galactoside permease C. ?-galactosidase

Biology & Microbiology

About ____ couples are affected by infertility

a. 0.5% of b. 1 in 6 c. 1 in 10 d. 1 in 100 e. 25% of

Biology & Microbiology

Which molecule carries an anticodon?

A. DNA B. mRNA C. rRNA D. tRNA

Biology & Microbiology

The nephridial organs of flatworms are called metanephridia

____________________ Indicate whether the statement is true or false.

Biology & Microbiology