Srb and Horowitz’s research led to the ____ hypothesis, which has since been modified to the ____ hypothesis
a. one gene-one enzyme; one gene-one polypeptide
b. one gene-one polypeptide; one gene-one enzyme
c. one gene-one protein; one gene-one enzyme
d. one gene-one polypeptide; one gene-one protein
e. one gene-one enzyme; one gene-one protein
ANSWER: a
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All microorganisms require
A) carbon, iron, and sodium. B) phosphorus, aluminum, and sodium. C) calcium, potassium, and magnesium. D) phosphorus, selenium, and sulfur.
Chemical bonds are based on attractions
between the ____ of two atoms.
a. electrons and protons b. protons c. protons and neutrons d. electrons e. neutrons
The physical location of a particular gene on a chromosome is called:a
an allele. b. a locus. c. a trait. d. a chromatid. e. None of these.
A forest community consists of not only the trees and shrubs, but also the animals and microorganisms.
Answer the following statement true (T) or false (F)