A specific stretch of DNA that codes for the amino acid sequence of a polypeptide is called a __________.

A. polypeptide
B. gene
C. nucleic acid base
D. nucleotide


B. gene

Biology & Microbiology

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During frog gastrulation, cells of the ____ of the blastopore control blastopore formation

a. blastocoel b. archenteron c. hypoblast

d. dorsal lip e. blastodisc

Biology & Microbiology

A person with an autosomal recessive disorder generally has how many copies of the dominant allele?

a) Two, on the X chromosome b) Two c) Zero d) Two, on the Y chromosome e) One

Biology & Microbiology

Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 has two extra neutrons. These two forms are:

A. oxygen isotopes. B. oxygen ions. C. oxygen isomers. D. oxygen dimers.

Biology & Microbiology

Nitrites (--NO2) are converted to nitrogen gas (N2) by 

A. decomposers. B. nitrogen-fixing bacteria. C. nitrifying bacteria. D. denitrifying bacteria.

Biology & Microbiology