Referring to Figure 10.17 if necessary, identify which type of cell-cell interaction is most likely to force the products of digestion to be absorbed across microvilli of intestinal cells rather than allowing them to leak between cells
A. gap junctions
B. tight junctions
C. plasmodesmata
D. hemidesmosomes
E. desmosomes
B
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Microsporangia in flowering plants are located in the _____
A) stamen B) carpel C) petals D) sepals E) receptacle
It is estimated that humans can produce over 1.5 million different types of antibodies. Which of the following statements regarding this extraordinary variation is INCORRECT?
A. We inherit over 1.5 million different and distinct immunoglobulin genes from our parents at fertilization. B. V and J domains of antibody light chains are randomly joined. C. Random segments of DNA can be removed from antibody genes. D. V and J domains of antibody heavy chains are randomly joined. E. Cytosines in the variable regions of antibody genes can be converted to uracils via hypermutation.
Which of the following is the binding site for
RNA polymerase on the DNA molecule? a. structural gene 1 b. repressor gene c. promoter sequence d. operator sequence e. region between an operator and the first structural gene
A phylogenetic tree:
a. is a hypothesis about evolutionary relationships. b. can illustrate selection pressures that have acted on taxa. c. shows the similarities between different taxa. d. must be rooted to properly convey evolutionary relationships. e. shows the number of character changes that have occurred between taxa.