Prokaryotes undergo a process that produces cells that are identical. This process is called
A. mitosis.
B. binary fission.
C. syngamy.
D. conjugation.
E. meiosis.
Answer: B
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Answer the following statements true (T) or false (F)
1. A single gene always encodes an enzyme. 2. RNA polymerase II of eukaryotes always requires more than one general transcription factor to initiate transcription. 3 The molecule mRNA, which contains the information to make a polypeptide, is constructed from a DNA template. 4. As part of the transcriptional unit, regulatory sequences are the sites where RNA polymerase and transcription factors bind to regulate transcription.
In pedigree charts, if both parents are carriers of an autosomal recessive disorders, typically the disorder will
A. occur every third generation. B. appear in every generation. C. seem to disappear in one generation, only to reappear in the next generation. D. appear only in females. E. appear only in males.
In a certain breed of chicken, an incomplete dominant gene controls color. The homozygous black (BB), when crossed
with the homozygous splashed-white (bb), produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a true-breeding black with a single comb and a true-breeding splashed-white with a rose comb. What will be an ideal response?
True/False: There are no antigens that can stimulate B-cells directly.
What will be an ideal response?