The antibiotic tetracycline binds to the 30S subunit of the ribosome as shown in Figure 20.1. The effect is to
a. Prevent attachment of tRNA.
b. Prevent peptide bond formation.
c. Prevent transcription.
d. Stop the ribosome from moving along the mRNA.
e. Prevent attachment of tRNA and mRNA.
Ans: b. Prevent peptide bond formation.
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Determine which of these statements best summarizes the cellular regulation of concentration gradients.
A. Selective permeability of the cell membranes results in equal amounts of substances inside and outside the cell. B. Enzymes are used in the cell to build molecules on one side of membranes to establish concentration gradients. C. Membrane phospholipids and proteins regulate transport functions to establish concentration gradients or equilibria. D. Passive and active transport both function with transport proteins to move materials across the cell membranes. E. The cellular regulations require large amounts of energy to maintain equilibrium of materials.
Consider this anomaly in daughter cells: One meiotic nucleus has two copies of a chromosome, and the other daughter cells does not have a copy of that chromosome. What caused this situation?
a. a centromere did not divide in metaphase I b. a centromere did not divide in anaphase II c. a centromere did not divide during telophase I d. a centromere did not divide during prophase II
What harvests energy from food molecules to make ATP?
A) Chloroplasts B) Mitochondria C) Nucleus D) Lysosome
The lysosome contains ________ enzymes.
Fill in the blank(s) with the appropriate word(s).