Which of the following cycles is thought to be most under biological control?
A) oxygen
B) phosphorus
C) sulfur
D) lead
A
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Although 61 different codons code for amino acids, cells contain fewer than 61 different tRNAs. Why?
A. Because the 5' base on the tRNA anticodon has some flexibility (wobble); thus, some tRNA anticodons can pair with more than one mRNA codon. B. Although 61 different codons code for amino acids, any given cell contains fewer than 61. C. Because the 5' base on the mRNA codon has some flexibility (wobble); thus, some mRNA codons can pair with more than one tRNA anticodon. D. Because each amino acid is coded for by just one codon.
Which of the following statements is false about the
consequences of STD infection? a. Males are more easily infected than females and develop more complications. b. Pelvic inflammatory disease is a complication resulting from some bacterial STDs. c. PID can cause infertility, tubal pregnancies, and chronic pain. d. Early symptoms of type II herpes virus Are often mild or absent. e. Untreated males with chlamydia are at risk for inflammation of the epididymis and infertility.
Who is credited with the discovery of prions as a new biological principle of infection?
a. Anton van Leeuwenhoek b. Dmitrii Ivanowsky c. Stanley Prusiner d. Stanley Brenner e. Carl Woese
In the logistic growth model, as the number of individuals in the population (N) approaches the carrying capacity (K), what happens to the intrinsic rate of growth (ri)?
A. It will be affected by increased competition within the species. B. It will be affected by a decreased death rate from predation. C. It will not change. D. It will be affected by an increased birth rate. E. It will be affected by increased competition with other species.