What type of virus structure does the adenovirus in Figure 13.18c represent?
A. head and tail
B. triangular
C. icosahedral
D. helical
E. spiral
C
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Describe two mechanisms that Archaea use to avoid their DNA melting at temperatures above 100 °C
What will be an ideal response?
Which of the following is TRUE concerning
the C4 pathway? a. It produces large amounts of carbohydrates. b. It feeds into the C3 pathway. c. It is the mechanism of photorespiration. d. It involves the activity of rubisco. e. All of these are true
Which of the following pairs of hormones regulates the calcium levels of the blood?
a. thyroxin and parathyroid hormone b. adrenocorticotropic hormone and thyroid stimulating hormone c. prolactin and oxytocin d. parathyroid hormone and calcitonin e. calcitonin and thyroxin
Which of the following is TRUE regarding how the DNA in your body's cells can accumulate mutations?
A) Some DNA spontaneously breaks down every second, making the chromosome significantly shorter with every passing day. B) Spontaneous mutation rates are around one in every four nucleotides that are replicated. C) The ultraviolet radiation in sunlight may induce changes in DNA. D) Mistakes are never made during DNA replication; they always occur during the G1 phase of interphase.