Which is not a method bacteria use to generate new combinations of genes?
A) Transformation
B) Transduction
C) Binary fission
D) Conjugation
C
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Which of the following is characteristic of animals?
(a) heterotrophy. (b) autotrophy. (c) photosynthesis. (d) both b and c.
An important message from the work of Thomas Malthus that influenced Charles Darwin was
A. animals tended toward "human perfection." B. only a fraction of any population will survive and reproduce. C. population size of humans can. D. inheritance of acquired characteristics. E. none of these. Charles Darwin was influenced by John Ray not Thomas Malthus.
Impetigo can be caused by either Staphylococcus aureus or Streptococcus pyogenes. Culture-based identification of the causative organism can be complicated by
A. the common surface antigens of these two organisms. B. the ability of S. aureus to kill S. pyogenes. C. their common optimal growth temperature, 37°C. D. the fastidious nature of both organisms.
The formation of the lens of the vertebrate eye from a skin layer in contact with an outgrowth of the embryonic brain is an example of
A. cellular aggregation. B. morphogenesis. C. neurulation. D. induction. E. gastrulation.