Calcium carbonate shells and thread-like pseudopods are characteristic of
A) euglenids.
B) alveolates.
C) foraminiferans.
D) excavates.
E) radiolarians.
C
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The earliest nucleic acid was probably a simple DNA molecule
Indicate whether the statement is true or false.
What is the purpose of getting a "flu shot" every year?
A. It lets your body get used to having the flu so that you won't feel as sick when you actually do get the flu. B. It exposes your immune system to antigens present on the flu virus, and antibodies can be made by the immune system C. It exposes your immune system to antibodies present on the flu virus, and antigens can be made by the immune system D. It exposes your immune system to the virus and causes gene recombination in memory B-cells.
Which of the following is not a known function of RNAi?
A. directing the replacement of amino acids in an existing polypeptide B. protection against invading RNA viruses C. control of transposon activity D. chromatin structure
The text discusses an incident where a number of
whales beached themselves in 2001. What is true about this case? a. It happened near an area where the United States Navy was testing a sonar system. b. Very loud, low-frequency sounds were sent through the water. c. The whales hurriedly surfaced in fear. d. Rapid change in pressure damaged the whales’ acoustic systems. e. All of these are true.