When people die from HIV infections, it is usually because they _____
A) have too many HIV particles in their lymphatic system, which causes it to shut down
B) have too few T cells to adequately fight infection
C) have too many T cells, and this overwhelms their immune systems
D) divert too much energy toward replicating the virus
Answer: B
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Caffeine from the coffee plant is stored in
a. central vacuoles. b. chloroplasts. c. chromoplasts. d. leucoplasts.
As early organisms evolved the ability to harness energy from the sun, other organisms began to die out because they were ____
a. destroyed by a meteorite b. outcompeted by multi-celled organisms c. consumed by dinosaurs d. poisoned by oxygen gas e. starved
Which of the following is responsible for nearly 100,000 human deaths worldwide every year?
A) Entamoeba histolytica B) Amoeba proteus C) plasmodial slime molds D) Dictyostelium discoideum
In his study of the foraging behavior of bumblebees, D. W. Inouye noted that both Bombus appositus and Bombus flavifrons feed from both larkspur and monkshood flowers when each is the only bumblebee species present
However, when both species are present, B. appositus feeds on only larkspur and B. flavifrons feeds on monkshood. This behavior is an example of A) habitat fragmentation. B) resource partitioning. C) predation. D) aggressive mimicry. E) intraspecific competition.