Which of the following is the outer layer of plasma membrane and elastic proteins that protects and gives shape to many unwalled, single-celled protists?
A. Eyespot
B. Capsid
C. Pellicle
D. Chitin
E. Cilia
Answer: C
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Classic experiments suggested that a floral stimulus, florigen, could move across a graft from an induced plant to a noninduced plant and trigger flowering
Recent evidence using Arabidopsis has recently shown that florigen is probably _____. A) a phytochrome molecule that is activated by red light B) a protein that is synthesized in leaves, travels to the shoot apical meristems, and initiates flowering C) a membrane signal that travels through the symplast from leaves to buds D) a second messenger that induces Ca++ ions to change membrane potential E) a transcription factor that controls the activation of florigen-specific genes
Reverse transcriptase is an enzyme that can synthesize DNA from an RNA template. What DNA sequence is produced from an RNA molecule with the sequence 5'AUUGACGGU3'?
A. 3'UAACUGCCA5'. B. 5'TTTCTGCCT3'. C. 3'TAACTGCCA5'. D. 5'ATTCAGCCT3'. E. 3'TUUCTGCCU5'.
In a DNA profile analysis using two loci, the chance of a match between two unrelated individuals at one locus is 1 in
400, and 1 in 1000 at the second locus. Therefore, the overall probability that two unrelated individuals will match at both loci is ____________________. Fill in the blank(s) with the appropriate word(s).
Viral mutations and variants are often categorized by changes in ________
A) host range and/or plaque morphology B) host range C) viral size D) plaque morphology E) capsid shape