Which of the following statements about plasma membranes is INCORRECT?
A. They are composed of phospholipids.
B. They have both integral and peripheral proteins.
C. They are relatively rigid structures.
D. They are composed of two leaflets of phospholipids.
E. They function to separate the extracellular and intracellular environment.
C. They are relatively rigid structures.
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A eukaryotic gene that is regulated by three activator proteins is said to be under
A. triplet regulation. B. individual control. C. self-regulation. D. combinatorial control. E. elastic control.
What, specifically, determines the sequence of
amino acids in a polypeptide of eukaryotes?
a. the DNA gene b. the introns c. the exons d. the initial mRNA transcript e. the tRNA anticodons
Most herbivorous animals do not have the ability to digest the cellulose in plants. What mechanism has evolved in the absence of this ability that allows them to survive despite eating only plant matter?
A) production of saliva containing amylase B) digestion by symbiotic microorganisms C) avoidance of plants containing cellulose D) converting cellulose to other carbohydrates in the animal's own cells
Consider a diploid population in which a single locus supports two alleles, A1 and A2, whose respective allele frequencies equal p and q. The summation of p+q would equal:
a. 0.25 b. 0.5 c. 1 d. 1.5 e. 2