#Question id: 10533
#Unit 2. Cellular Organization
Following statements are regarding to the fluidity of a bilayer.
A. A lipid bilayer cools below a characteristic transition temperature, it undergoes a sort of phase change in which it becomes a liquid; that is, it loses its fluidity.
B. Above the transition temperature, the highly mobile lipids are in a state known as a liquid crystal.
C. The bilayer is thicker in the gel state than in the liquid crystal state due to the stiffening of the hydrocarbon tails at lower temperatures.
D. The transition temperature of a bilayer decreases with the chain length and the degree of saturation of its component fatty acid residues for the same reasons that the melting points of fatty acids increase with these quantities.
Which of the following combination is correct?
#Question id: 4890
#Unit 8. Inheritance Biology
A strain of Neurospora crassa, unable to synthesize the vitamin thiamine (t), is crossed with a strain that cannot synthesize the amino acid arginine (a). What information can be obtained from the resultant frequencies of ascospore patterns?
A) The two loci (a) and (t) are independent assortment of each other
B) Both genes are closely linked to their respective centromeres.
C) no crossovers occurred between either gene and its centromere.
D) These two gene may reside on different chromosomes.
#Question id: 30089
#Unit 2. Cellular Organization
#Question id: 4198
#Unit 3. Fundamental Processes
An elongation factor EF-Ts serves mainly to
#Question id: 2265
#Unit 2. Cellular Organization
Passage through pores in the nuclear envelope is restricted primarily to