#Question id: 33452
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 2984
#Unit 2. Cellular Organization
Certain unicellular eukaryotes, including diatoms and some yeasts, have mechanisms of nuclear division that may resemble intermediate steps in the evolution of mitosis. Which of the following is a characteristic feature of nuclear division in these organisms?
#Question id: 6990
#Unit 5. Developmental Biology
Insects such as Drosophila undergo three molts before becoming a pupa and undergoing metamorphosis. Molting, which is also called 'ecdysis', is controlled by what hormone?
#Question id: 4569
#Unit 11. Evolution and Behavior
Which of the following must exist in a population before natural selection can act upon that population?
#Question id: 4094
#Unit 3. Fundamental Processes
The accompanying figure depicts the map of a part of E. coli genome harboring the lac operon.
lac mRNA would hybridize to which of the following DNA?
1) lac I; 2) lac 0; 3) lac Z; 4) lac Y; 5) lac A