The number of T cells drops to below 200 cells/microliter in which phase of HIV infection?
A) phase 1
B) phase 2
C) phase 3
D) initial phase
E) asymptomatic phase
C
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Metabolism is a unifying characteristic of all cellular organisms
Indicate whether the statement is true or false.
C3 plants are more susceptible to photorespiration than either C4 or CAM plants. Why do most plants lack the C4
pathway?
a. Rubisco is more efficient in C3 plants when compared to rubisco of C4 and CAM plants. b. Photorespiration is not a serious problem for most plants. c. Most plant species do not have vacuoles in their cells to store the malate generated from CO2 taken in during the night. d. There is an energetic cost to C4 and CAM pathways that only makes them advantageous in very hot and/or arid environments. e. Switching between C3, C4, and CAM photosynthesis is very difficult for most plants.
Microtubules grow from a barrel-shaped organelle called the ____, which remains below the finished array as a ____
a. cilium; motor protein b. cell cortex; centriole c. microfilament; basal body d. centriole; intermediate filament e. centriole; basal body
Injecting DNA into cells can be accomplished using
A) nitrocellulose membranes. B) silicon chips and nucleic acids. C) compressed air and gold beads. D) micropipettes. E) micropipettes, or compressed air and gold beads.