Which of the following is one of the technical reasons why gene therapy is problematic?
A) Most cells with an engineered gene do not produce gene product.
B) Cells with transferred genes are unlikely to replicate.
C) Transferred genes may not have appropriately controlled activity.
D) mRNA from transferred genes cannot be translated.
C
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During development, an XX female embryo will form one of the X chromosomes in each cell into a Barr body. This usually occurs
A) about two weeks after zygote formation. B) by the end of the first trimester. C) at the 16-cell stage. D) in the X that has the most recessive alleles.
An experimental group
A. is the same as the control group. B. differs from the control group by one variable. C. differs from the control group by several variables. D. is not necessary if an experiment contains a control group.
Although 61 different codons code for amino acids, cells contain fewer than 61 different tRNAs. Why?
A. Although 61 different codons code for amino acids, any given cell contains fewer than 61. B. Because the 5' base on the mRNA codon has some flexibility (wobble); thus, some mRNA codons can pair with more than one tRNA anticodon. C. Because the 5' base on the tRNA anticodon has some flexibility (wobble); thus, some tRNA anticodons can pair with more than one mRNA codon. D. Because each amino acid is coded for by just one codon.
Choose the letter of the best match from the following:A. hypocotylB. endospermC. scutellumD. radicleE. epicotylNutritive tissue within angiosperm seeds.
Fill in the blank(s) with the appropriate word(s).