#Question id: 13129
#Unit 10. Ecological Principles
Biologists performed an experiment with flies to examine the effects of population size on the maintenance of genetic variation and on egg-to-adult survival. From a large source population, they randomly assigned eggs to three experimental populations of size N, equal to 20, 60, and0100. For later generations, they collected N eggs from each population and moved them into identical vials that co0ntained f2re0sh me4d0ium. Th6e0y coun8te0d the number of adult flies that emerged and used tissue samples from the adults for genetic analyses. Genetic variation was measured by scoring alleles at several polymorphic loci and expressed as the average number of alleles at those loci. The results are summarized in Figure 1 and Figure 2 below.
Based on Figure 1, which of the following best describes the change in genetic variation over time?
#Question id: 27383
#Unit 1. Molecules and their Interaction Relevant to Biology
Choose the correct statement related to the atomic size Cl and Mg
#Question id: 2636
#Unit 2. Cellular Organization
Which of the following events occur when E. coli is starved for tryptophan?
I. The ribosome translates leader peptide completely
II. Transcription reads through attenuator into trp EDCBA
III. Tryptophanyl tRNA is not formed
IV. A stem loop structure involving regions 3 and 4 is formed at attenuator site
#Question id: 3045
#Unit 2. Cellular Organization
Which one of the following combinations Mac-Conkey Agar allows to growth of gram negative bacteria?
(P) Bile salts (Q) Sodium chloride
(R) Methylene blue (S) Crystal violet
#Question id: 4453
#Unit 3. Fundamental Processes
Correct statements about regions of the s70 factor which can be divided into four regions called s region 1 through s region 4;