Hyphae that contain two genetically distinct, sexually compatible nuclei within
each cell are described as:
a. twins.
b. couplets.
c. dikaryotic.
d. polykaryotic.
e. double hyphae.
c
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If the att site of Escherichia coli was dissimilar to that of lambda phage due to a mutation, how would transduction be affected?
A. Phage DNA would be unable to integrate into host DNA. B. Lambda phage would be unable to package host DNA. C. Transduction would not be affected since mutation is only in the host cell. D. Specialized transduction would become generalized.
Which is the correct order of tissues, from the center to the surface of a root?
a. vascular tissue, cortex, epidermis, pith b. pith, cortex, vascular tissue, epidermis c. pith, vascular tissue, cortex, epidermis d. cortex, pith, vascular tissue, epidermis
Which of the following does NOT require the
participation of a membrane protein? a. active transport b. exocytosis c. facilitated diffusion d. simple diffusion e. all of these require a protein
A woman heterozygous for blood type A and a man with blood type AB are expecting a child. The probability of the child having type B blood is
A. 0. B. 1/4. C. 1/2. D. 3/4.