TLS Online TPP Program

#Question id: 2210


Which of these is a general feature of the lipid bilayer in all biological membranes?

#XL - Q Biochemistry
  1. Individual lipid molecules are free to diffuse laterally in the surface of the bilayer.

  2. Individual lipid molecules in one face (monolayer) of the bilayer readily diffuse (flip-flop) to the other monolayer.

  3. Polar, but uncharged, compounds readily diffuse across the bilayer.

  4. The bilayer is stabilized by covalent bonds between neighboring phospholipid molecules.

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TLS Online TPP Program

#Question id: 8291

#XL - T Zoology

Which of the following pairs are the best examples of homologous structures?

TLS Online TPP Program

#Question id: 8292

#XL - S Microbiology

Some molecular data place the giant panda in the bear family (Ursidae) but place the lesser panda in the raccoon family (Procyonidae). If the molecular data best reflect the evolutionary history of these two groups, then the morphological similarities of these two species is most likely due to ________.

TLS Online TPP Program

#Question id: 8293

#XL - S Microbiology

The importance of computers and of computer software to modern systematics s is most closely linked to advances in ________.

TLS Online TPP Program

#Question id: 8294

#XL - S Microbiology

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The fourchambered hearts of birds and mammals are best described as ________.

TLS Online TPP Program

#Question id: 8295

#XL - S Microbiology

Imagine that a phylogeny was developed for a group of mammals based on bone structure. Which of the following statements would be a reasonable prediction about a phylogeny for the same group of species based on similarities and differences in the structure of a particular enzyme?

TLS Online TPP Program

#Question id: 8685

#XL - S Microbiology

Which of the following would be most useful in creating a phylogenetic tree of a taxon?