Refer to Figure 26-2. The process occurring in the cells labeled 2 in the sequence is:
a. fertilization.
b. syngamy.
c. the first meiotic division.
d. the second meiotic division.
e. mitosis.
C
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Winogradsky columns are used primarily for enrichment of
A) aerobic cultures, although occasionally anaerobes do appear. B) anaerobic cultures, although occasionally aerobes do appear. C) aerobes, anaerobes, and phototrophs. D) phototrophs, although occasionally heterotrophs do appear.
A small amount of DNA is collected from a crime scene. However, the amount of DNA collected is insufficient to perform the necessary experiments to link a suspect to the crime. Which method could be utilized to increase the amount of DNA?
A. polymerase chain reaction (PCR). B. DNA sequencing. C. fluorescent labeling of DNA. D. microarray analysis. E. gel electrophoresis.
What important property do dinoflagellates contribute to coral reefs?
1.They supply oxygen and sugar. 2.They produce the calcium carbonate that gives the reef its structure. 3.They are parasites of other organisms that would colonize and destroy the reefs. 4.They help to regulate the temperature inside the reef.
Which event does not take place before the start of mitosis?
A. The nuclear envelope disintegrates. B. Organelles proliferate. C. DNA is replicated. D. The parent cell grows.