In human development, cell rearrangement within the ball of cells (morula) leads to a hollow sphere with a "mound" of cells at one pole. This group of cells is called the:
A. mesoderm.
B. blastocyst.
C. neural plate.
D. inner cell mass.
E. gastrula.
D
You might also like to view...
What is generally true about biomass and energy as we move from one trophic level to the next?
A. They both increase. B. Organisms at one trophic level always consume all of the resources from the level below them. C. Not all energy is transferred to the next trophic level. D. All of the energy stored initially in organic molecules by the primary producers will be available to the secondary consumers. E. Biomass increases but energy decreases.
In a monohybrid cross AA × aa, what proportion of homozygotes is expected among the F2 offspring?
A) 1/4 B) 1/2 C) 3/4 D) All are homozygotes. E) None are homozygotes.
Which portion of the renal tubule empties directly into the collecting duct?
a. Bowman's capsule b. distal convoluted tubule c. proximal convoluted tubule d. descending loop of Henle e. ascending loop of Henle
What type of cellular damage in a malarial parasite would prevent it from penetrating a red blood cell?
A. Failure of the cross-linking of the peptidoglycans B. Mutation in the variable surface glycoprotein genes C. Damage to the choanocytes D. A disruption of the cytoskeletal proteins