Four of the five answers listed below are
characteristics of phloem. Select the
EXCEPTION.
a. consists only of dead cell walls
b. connect end to end at sieve plates
c. involved in translocation
d. includes accessory companion cells
e. transports sugar
A
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Operons can best be defined as
A) operational mutations affecting gene expression. B) a set of genes under common regulatory control. C) dominant alleles responsible for enzyme synthesis. D) a balance between repressor and inducer molecules. E) a common mode of gene expression in bacteria.
An sRNA is isolated from a bacterial cell. What would you do to determine whether it is a cis-encoded or a trans-encoded sequence?
A. Find out if the sRNA acts as a transcriptional or as a translational inhibitor. B. Determine whether the sRNA binds to mRNA or to tRNA. C. Analyze the molecular position of hydrogen atoms in the sRNA nucleotides. D. Identify whether or not the sRNA sequence is complementary to the coding strand of mRNA gene target.
vitamin responsible for synthesis of hormones
What will be an ideal response?
Root hairs grow actively in which area of the developing roots?
A. Endodermis B. Zone of cell division C. Zone of maturation D. Zone of elongation E. Root cap