What enables the pigments indigo and carmine to capture light?
a. a single hydrogen bond
b. a single bond of any element
c. a conjugated system
d. a double oxygen bond
Ans: c. a conjugated system
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Why does sexual reproduction require both meiosis and syngamy?
A. The process of meiosis results in the production of gametes in which the number of chromosomes remains the same. During syngamy, two gametes fuse to form a new cell, and the number of chromosomes is restored to the full amount. Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained. B. The process of meiosis results in the production of gametes in which the number of chromosomes is reduced by half. During syngamy, two gametes fuse to form a new cell, and the number of chromosomes is restored to the full amount. Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained. C. The process of meiosis results in the production of gametes in which the number of chromosomes is doubled. During syngamy, gametes are reduced by half, and the number of chromosomes is restored to the full amount. Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained.
Answer the following statements true (T) or false (F)
1. No microorganisms are able to live in the stomach because of the extremely low pH of the stomach contents. 2. Microbial communities known as biofilms are interesting, but they have no medical significance. 3. Microorganisms are unable to live in the colon owing to the lack of oxygen there. 4. Some of the bacteria used in bioremediation are naturally occurring, but others have been genetically engineered. 5. Many of the members of our indigenous microflora have the potential to cause disease.
The influenza virus contains an RNA genome. Why do scientists typically have to make a new vaccine for the flu every year?
Because our bodies develop resistance to the vaccine and it becomes less effective Because the virus develops resistance to the vaccine Because the virus can mutate into new strains Because people change their habits each year and become susceptible to different strains of the virus Because the common influenza virus can come from many species of animals including cats and dogs
As you visit the high desert of southeastern Arizona, you come to a flowing stream that disappears into the sand
You notice that insects are flying up to the moist sand for a drink, but as the flow varies and waves of muddy water wash over the animals, fine soil particles cover them and entomb them. The beginnings of what process have you just witnessed, and what might the next steps be?