The resistance of Archaeans to extremes of temperature, salinity, and pH is thought to be due to what structural feature?
a. covalent crosslinking among membrane phospholipids
b. phospholipids that spin, drift, and wiggle without leaving the bilayer
c. membrane proteins that are covalently bonded together
d. high proportion of unsaturated fatty acids in phospholipids
a
You might also like to view...
Homologous chromosomes are held together in the
A) synaptonemal complex. B) centromere. C) kinetochore. D) nucleus. E) MTOC
The mutations found in the CF gene that result in cystic fibrosis are recessive because
A) the protein produced by the normal allele is sufficient for normal cellular function. B) the CF mutations always result in no protein being produced. C) CF mutations result in a protein that has normal function only if normal CF protein also exists in the cell. D) dominant alleles that cause a fatal disorder, such as cystic fibrosis, cannot be inherited.
The placenta
A) allows diffusion of nutrients, gases, and wasted between the mother and the fetus. B) consists only of maternal tissue. C) is a site in which bacteria have never been detected. D) consists only of fetal tissue. E) allows mixing of maternal and fetal blood.
Biology is:
A) the study of living things. B) always used responsibly in advertising claims. C) a separate branch of science that studies how organisms interact with each other and with their environment. D) mostly a collection of facts that can be ordered and memorized. E) the means by which we can answer questions such as "Does God exist?"