A polysome is ____
a. the combination of a large and a small ribosomal subunit
b. the complex where mRNA splicing occurs
c. the promoter assembly at the site of transcription initiation
d. an mRNA transcript to which multiple ribosomes are attached
e. the complex that adds a poly(A) tail onto an mRNA
ANSWER: d
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Which two observations led Darwin to conclude that there is competition for survival?
A. Fossils and mutations B. Overproduction of organisms and limited food resources C. Gene and allele differences in organisms D. Natural selection and descent with modification
A particular chemical reaction is exergonic. What can you say about the relationship between the reactants and the products in this exergonic reaction?
A. The reactants cannot spontaneously react to generate the products B. The reactants likely have lower enthalpy than the products C. The reactants have more free energy than the products D. The reactants are likely more disordered and the products are likely more ordered
The cell is the basic structural/functional unit common to all living organisms.
Answer the following statement true (T) or false (F)
What has identical molecular formulas but different structures and characteristics?
A. enantiomers B. stereoisomers C. isomers D. isomers, sterioisomers, and enantiomers E. isotopes