Which of the following bacterial groups is thought to be most closely related to the last universal common ancestor?
A) Alphaproteobacteria
B) cyanobacteria
C) deeply branching bacteria
D) green filamentous bacteria
Ans: C) deeply branching bacteria
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Why is Caenorhabditis elegans an appropriate model organism for studying developmental processes?
A) C. elegans does not undergo programmed cell death B) C. elegans have meristems, regions that contain many stem cells C) C. elegans are transparent, and have only about 1000 cells, allowing the cells to be followed during development. D) C. elegans have millions of cells, but can be easily mutated to have no gastrulation. E) C. elegans have genes that are completely unique from mice and humans.
This forms a seal that prevents the movement of substances between cells, for instance from the intestinal lumen into the blood.
A. gap junctions B. tight junctions C. desmosomes D. hemidesmosomes E. focal adhesions
How are the red blood cells produced in the body, and what might stimulate this process?
What will be an ideal response?
An individual that has two dominant alleles for a trait (AA) is called __________.
Fill in the blank(s) with the appropriate word(s).