How do modified bases in the first position of the anticodon affect the specificity of base pairing?
What will be an ideal response?
Ans: Certain modifications of the standard bases make certain base pairing more likely or make it exclusive, compared to the normal wobble base pairing rules. These modified bases make the tRNAs more restricted in their codon specificity.
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The development of septa in the hyphae of fungi was an important evolutionary step. Why?
A. If a hypha is damaged, fungi can seal septa pores to prevent cytoplasmic leakage. B. If a hypha is damaged, septa can secrete chemicals to attract symbiotic cyanobacteria. C. Septa can produce fungal spores during both sexual and asexual reproduction. D. Septa can produce different fungal mating types that aid in sexual reproduction.
Tanya’s son Micah has hemophilia A. Who
else in Micah’s family definitely has hemophilia A?
a. his mother b. his father c. his mother’s father d. his mother’s mother e. his brother
Viruses are classified by:
a. the sequence of their DNA. b. structural similarities. c. the sequence of their rRNA genes. d. the traditional Linnaean binomial nomenclature system. e. an international committee
Which of the following controls fluid balance by reabsorption of water and sodium?
A) aldosterone B) antidiuretic hormone C) osmoreceptors D) chemoreceptors