Ribosomal subunits
a. come together in threes to form functional units.
b. are composed of mRNA and structural proteins.
c. are synthesized in the cytoplasm.
d. converge only when mRNA is to be translated.
e. are transcribed from the complementary strand
of DNA that is used for tRNA transcription.
Answer: d
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Cystic fibrosis is caused by a recessive loss-of-function mutation that encodes a protein called the ________
A) cystic fibrosis transmembrane ion channel B) chloride ion transmembrane conductance regulator C) cystic fibrosis transmembrane conductance regulator D) cystic fibrosis ion channel regulator
The first air-breathing land animals were:a
vertebrates. b. amphibians. c. snails. d. reptiles. e. arthropods.
Scientists can produce novel proteins by modifying existing proteins using:
A) affinity-related targeting B) site-directed mutagenesis C) modular construction D) the yeast two-hybrid system
Different modification of the histone have different effects on gene expression. For instance, the ninth amino acid of histone 3 is a lysine (H3K9 ) can be acetylated once or methylated up to three times. Which of the following is true regarding H3K9
modification? A) If H3K9 is acetylated, then the gene will be repressed. B) If H3K9 has a single methyl group, then the gene will be repressed. C) If H3K9 has two methyl groups, then the gene will be activated. D) If H3K9 has three methyl groups, it is maximally activated compared to only having one methyl group. E) If H3K9 has three methyl groups, then the gene will be repressed.