Small circular, extrachromosomal DNA segments are known as ________.
A. clones
B. vectors
C. plasmids
D. RNA
Answer: C
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Diploid somatic cells of elephants have 56 chromosomes. If nondisjunction of one of an elephant's chromosomes occurs in meiosis II, the resulting sperm are expected to have the chromosome complement:
A. 28, 28, 28, 28 B. 28, 28, 29, 27 C. 29, 29, 27, 27 D. 29, 29, 28, 28 E. 56, 56, 57, 55
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Today, instead, DDT is largely useless against many insects. Which of these would have been required for this pest eradication effort to be successful in the long run?
A. Larger doses of DDT should have been applied. B. None of the individual insects should have possessed genomes that made them resistant to DDT. C. The frequency of DDT application should have been higher. D. All habitats should have received applications of DDT at about the same time. E. DDT application should have been continual.
The partial negative charge at one end of the water molecule is attracted to a partial positive charge of another water molecule. What is this type of attraction called?
a. a polar covalent bond b. an ionic bond c. a hydration shell d. a hydrogen bond e. a hydrophobic bond
Streptococcus agalactiae is associated with which of the following diseases?
A) neonatal bacteremia B) neonatal meningitis C) neonatal pneumonia D) both neonatal bacteremia and neonatal meningitis E) neonatal bacteremia, neonatal meningitis, and neonatal pneumonia