Which substance was used by ancient organisms to produce energy?

a. Hydroxide
b. Methane
c. Carbohydrates
d. Oxygen
e. Water


b

Biology & Microbiology

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The small circular molecules of DNA commonly found in bacteria are called ________.

A. plastids B. chromatids C. plasmids D. loops

Biology & Microbiology

Genomics studies have shown that humans and rice share about ____ percent of their genomes

a. 1 b. 4 c. 8 d. 15 e. 25

Biology & Microbiology

Sucrose is composed of

a. two molecules of fructose. b. two molecules of glucose. c. a molecule of fructose and a molecule of glucose. d. a molecule of fructose and a molecule of galactose. e. a monosaccharide and a disaccharide

Biology & Microbiology

A bacterium has the following lac operon genes located on the chromosome: I+P?Z?Y?A+. On a plasmid, this same bacterial cell has the lac genes I?P+Z?Y+A?. Which protein products will be made from lac genes in response to the presence of lactose?

What type of protein expression (induced or constitutive) will there be for each protein that is made? What will be an ideal response?

Biology & Microbiology