The genetic information of an organism is coded within that organism's
a. DNA.
b. carbohydrates.
c. lipids.
d. proteins.
e. cell membranes.
A
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CD4 molecules are found on T ________ cells, whereas CD8 molecules are characteristic of T________ cells.
Fill in the blank(s) with the appropriate word(s).
You isolate a plant that expresses a phytochrome mutant that is always in the
Pfr form. You expect these plants will germinate A. not at all. B. regardless of the light conditions. C. later than normal plants. D. similarly to normal plants.
The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it.
A: low; high; lac operator B: high; low; lac operator C: low; high; lac promoter D: low; high; lac repressor E: high; low; lac inducer
Genetic information in DNA and RNA is stored as a sequence of three nucleotide bases. On DNA a group of three nucleotides is called a _____, while on the complementary strand of mRNA, this sequence is called a ____ .
a. genome / proteome b. intron / exon c. base triplet / codon d. codon / anticodon e. base triplet / anticodon