The atomic number is determined by the number of ____.?
a. protons
b. neutrons
c. electrons
d. protons plus neutrons
e. protons plus electrons
Answer: a. protons
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What is the difference between a gene that is derepressed and one that is induced?
A. A gene that is derepressed is turned on because a repressor protein is not bound without its cofactor. By comparison, a gene that is induced is turned on because an inducer molecule prevents binding of the repressor. B. Genes that are derepressed are turned on because an inducer molecule is present. By comparison, a gene that is induced is turned on because a repressor protein is bound to the operator. C. There is no difference between a gene that is derepressed and one that is induced. D. A derepressed gene is turned off and an induced gene is activated to be expressed.
Down syndrome involves trisomy of chromosome number
a. 3. b. 5. c. 15. d. 19. e. 21.
Macromolecules that are capable of self-replication are:a
proteins. b. polysaccharides. c. steroids. d. DNA and RNA. e. triglycerides.
The "naked" seeds of conifers develop on the shelf-like scales of the ______.
A. Microsporocyte B. Pollen cones C. Microsporangia D. Ovulate cones E. Male cones