Gene therapy involves:a
replacing all mutant alleles in body cells.
b. replacing poor copies of alleles with normal alleles.
c. replacing a mutant allele in certain body cells with a normal allele.
d. repairing mutant alleles in certain body cells.
e. improving gene expression in key body cells.
c
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What is a plant’s main line of defense against
viral infection?
a. immune system cells b. viral toxins within the central vacuole c. membrane proteins that latch onto virus particles d. a thick cell wall that prevents viral entry e. a nuclear membrane that is impermeable to viruses
The formal taxonomic system used by biologists today was developed by __________.
Fill in the blank(s) with the appropriate word(s).
List the following events of oogenesis and fertilization, assuming fertilization does occur, in the correct sequence beginning with the first event to occur at the top.
What will be an ideal response?
Which of the following statements concerning dietary protein is true?
A. Dietary protein is digested to nucleic acids, which are used to make DNA. B. The average American eats about half the recommended protein. C. Protein should supply the bulk of our dietary calories. D. Growth in children may be delayed or stunted if essential amino acids are not present in their diets. E. It is not possible for vegetarians to have a balanced diet with adequate protein intake.