The eukaryotic 45S pre-rRNA transcript codes for the
a. 28S rRNA.
b. 28S and 18S rRNAs.
c. 28S, 18S, and 5.8S rRNAs.
d. 28S, 18S, 5.8S, and 5S rRNAs.
Ans: c. 28S, 18S, and 5.8S rRNAs.
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A species' fundamental niche:
A. is smaller than its realized niche. B. is what is actually occupied by that species. C. is determined by competition between species. D. has the necessary resources and conditions for survival. E. is always occupied in full by most species.
Answer the following questions true (T) or false (F)
1. In generalized transduction, viruses carry random DNA sequences from one cell to another. 2. Nucleotide analogs cause frameshift mutations. 3. Gene therapy for human genetic diseases has not been successful yet.
In chronological order, the three steps of the Calvin cycle are:
A) ATP production, the electron transport chain, and fixation of NADPH. B) sugar creation, regeneration, and ATP production. C) the splitting of water, the electron transport chain, and the passing of electrons to NADP+. D) fixation of CO2, sugar creation, and regeneration. E) regeneration, fixation of NADP+, and sugar creation.
Why are X-linked recessive genetic disorders more commonly seen in males?
a. For an X-linked disorder to occur, an individual must receive one allele only found on the X chromosome and a second allele found only on the Y chromosome, which females do not have. b. Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy. c. The alleles of sex-linked genes are carried only on the Y chromosome, which females do not have. d. Females only have X chromosomes and genes on the X chromosome are not expressed.