What is the consequence to a bacterial cell of a mutation that inactivates the enzyme responsible for methylating the A in the DNA sequence 5? GATC?
A) Replication of the lagging strand cannot be completed.
B) Thymine dimers cannot be repaired.
C) Parental and new DNA strands cannot be distinguished during mismatch repair.
D) Expression of certain metabolic genes is decreased.
E) The mutation rate of all genes will be lower.
C) Parental and new DNA strands cannot be distinguished during mismatch repair.
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Which of the following best describes the tRNA binding sites of the ribosome?
A. Only one of the three sites can be occupied by a tRNA molecule at any given time. B. Each tRNA that associates with the ribosome must first bind in the P site and then move to the A site. C. The P site contains the tRNA molecule covalently bound to the growing chain of amino acids. D. All tRNAs leave the ribosome through the A site.
Which of the following is not correct concerning the initiation of bacterial replication?
A. It involves a region of the DNA called oriC B. DNA proteins bind to the DNA to begin separation of the strands C. The strands are initially separated at GC-rich regions of DNA D. Following initial separation, DNA helicase enzymes continue to unwrap the DNA
A foramen magnum located at the rear (posterior) of the skull indicates that the animal ________
a. could vary its body position from upright to quadruped b. walked upright c. was a hominid d. walked on all four feet
What stimulates spermatogenesis?
A. FSH B. Progesterone C. LH D. Estradiol E. Testosterone