#Question id: 2243
#Unit 2. Cellular Organization
Features of the fluid mosaic model of membrane structure include:
A. a lipid bilayer.
B. dynamic motion of both membrane lipids and proteins.
C. proteins that may either rest on the surface or penetrate the membrane.
D. the hydrophobic core of the bilayer prevents the unassisted movement of water-soluble substances from one side to the other.
E. Covalent interactions between phospholipids, and between phospholipids and proteins, lend strength and resilience to the membrane.
Which of the following is correct?
#Question id: 8702
#Unit 9. Diversity of Life Forms
The question refers to the following table, which compares the percent sequence homology of four different parts (two introns and two exons) of a gene that is found in five different eukaryotic species. Each part is numbered to indicate its distance from the promoter (for example, Intron I is the one closest to the promoter). The data reported for species A were obtained by comparing DNA from one member of species A to another member of species A.
Regarding these sequence homology data, the principle of maximum parsimony would be applicable in ________.
#Question id: 4080
#Unit 3. Fundamental Processes
How the location of exons and introns within a gene are determined?
#Question id: 12365
#Unit 10. Ecological Principles
#Question id: 1005
#Unit 1. Molecules and their Interaction Relevant to Biology
The first step in the de novo biosynthesis of IMP is a reaction between glutamine and PRPP. Which statement is not true about this reaction?