Cross-breeding has been used to produce featherless chickens to ____
a. make it easier to process after slaughter
b. prevent a feather infecting disease
c. be more resistant to high temperatures in the desert
d. improve breeding efficiency
e. increase their lifespan
ANSWER: c
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This sequence of questions is designed to help students understand the critical role bacteria and archaea play in the sulfur and nitrogen biogeochemical cycles. No one organism can perform all the reactions in the cycle
Some of these reactions are solely catalyzed by microbes, solidifying their necessity and importance in supporting all life on Earth. Consider the chemical reactions of the sulfur cycle shown in Figure 26.10 and the nitrogen cycle shown in Figure 26.11. Oceans constitute the most significant reservoir of sulfur in the biosphere, and sulfate (SO4 2- ) reduction is the most predominant form of anaerobic respiration in marine environments. In such cases, oxidized sulfur compounds like SO4 2- are the electron acceptors instead of what? A. water B. oxygen C. hydrogen D. carbon dioxide
Which of the following statements is true regarding the vascular cambia of ancient (extinct) lycophytes? Select all correct choices
A. Ancient lycophytes did not possess vascular cambia. B. Ancient lycophytes had vascular cambia that formed only secondary phloem. C. Ancient lycophytes had vascular cambia that formed only secondary xylem. D. Ancient lycophytes had vascular cambia that formed both secondary xylem and secondary phloem.
What is the correct order for the steps in transduction?
A. 1) Phage infects cell 2) Phage transported DNA recombines with chromosome of new cell 3) Host DNA digested into fragments 4) Some phage accidently carry host DNA fragment 5) Phage infects new cell B. 1) Phage infects cell 2) Phage transported DNA recombines with chromosome of new cell 3) Host DNA digested into fragments 4) Phage infects new cell 5) Some phage accidently carry host DNA fragment C. 1) Phage infects cell 2) Host DNA digested into fragments 3) Some phage accidently carry host DNA fragment 4) Phage infects new cell 5) Phage transported DNA recombines with chromosome of new cell D. 1) Phage infects cell 2) Phage transported DNA recombines with chromosome of new cell 3) Some phage accidently carry host DNA fragment 4) Phage infects new cell 5) Host DNA digested into fragments
Refer to Table 19-1. The frequency of the recessive allele, d, is:
a. 0.15. b. 0.25. c. 0.35. d. 0.55. e. 0.75.