Why would it be more difficult to treat diseases in humans caused by members of the Eukarya than diseases caused by the Bacteria?
A. Multicellular organisms always have their own immune systems to contend with-so any treatment we develop needs to overcome this built-in protection mechanism in such organisms.
B. Since bacteria are so much simpler (being single-celled), they are inherently easier to kill off than multi-cellular eukaryotic microbes.
C. Eukaryotic microbes use many of the same enzymes and systems as humans-so we lose the ability to target certain molecules that might be present ONLY in the cell type we want to eliminate. There's too much overlap when both organisms are eukaryotic.
D. Eukaryotic microbes (unlike prokaryotes) often secrete compounds that breakdown and eliminate drugs used against them. This makes them much harder to effectively eliminate than bacteria.
C
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An animal with an open circulatory system
a. lacks a continuous network of blood vessels that contain the blood at all times. b. can have only one heart. c. has two separate vascular circuits. d. is able to distribute substances faster than a closed system. e. can grow larger than one with a closed circulatory system.
Which of the following is not produced in the
light dependent reactions? a. glucose. b. oxygen. c. ATP. d. NADPH. e. all of these are produced
Scientists estimate that at least 50-60% of all species now living will most likely become extinct in the next 20-50 years unless planned, coordinated action takes place.
Answer the following statement true (T) or false (F)
Which process converts one parental double-stranded DNA molecule to two identical offspring molecules?
A. transformation B. transcription C. replication D. translation