Which of the following is true of gap junctions?
A. They are holes in the cell wall through
which the plasma membrane and
endoplasmic reticulum of adjacent cells are
connected.
B. They are channels in the plasma
membrane of plant cells made of
transmembrane proteins that allow ions and
small molecules to pass between adjacent
cells.
C. They are channels in the plasma
membrane of animal cells made of
transmembrane proteins that allow ions and
small molecules to pass between adjacent
cells.
D. They provide points of structural support
between adjacent plant cells.
E. They provide points of structural support
between adjacent animal cells.
C
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A B cell CstF-64 mutant will likely:
A. constitutively secrete IgM antibodies. B. selectively remove the VDJ region from IgM antibodies. C. cut IgM pre-mRNA at every available 3'-end cleavage site. D. undergo IgM pre-mRNA splicing between the heavy chain exons and the membrane anchoring exon.
Phenotype is ____
a. only expressed in a heterozygous organism b. an observable property or expression of a trait in an organism c. the specific genetic constitution of an organism d. the variation of genes e. cannot be determined by knowing genotype
The most widespread and fastest growing STD in the
United States is a. chlamydia b. human papillomavirus infection c. genital herpes d. gonorrhea e. trichomoniasis
What is the main consideration in determining a trophic level?
A) feeding level B) production level C) community level D) energy loss level E) efficiency level