The cytoplasm of a certain cell, such as a neuron, already has a high concentration of K+ ions. How can K+ ions continue to enter the cell?
A) Exocytosis
B) Active transport
C) Osmosis
D) Infusion
E) Facilitated diffusion
B
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In the figure above, which number identifies the cell(s) or portion of the cell(s) that will respond to a
single photon?
a. 1 only b. 2 only c. 4 and 7 d. 5 and 8 e. 3 and 6
Paired lungs are characteristic of ____
a. spiders b. all birds c. all fishes d. all amphibian life stages e. all insects
The populations of keystone predators are controlled by the populations of their prey species
Indicate whether the statement is true or false
You are performing an experiment to study replication of DNA in E. coli. Replication initiation was synchronized and DNA was recovered every 5 minutes and an analysis was done to look for DNA replication in specific regions of the E. coli chromosome. Assume that these regions of the chromosome are adjacent to each other in the following order: Region A, Region B, Region C, Region D. The data below indicate the times during which DNA replication was observed in each of these regions. Using these data, which region or regions of the bacterial chromosome most likely contained an origin of replication?Times When DNA Replication Was Observed in Each Region:Region A: 40 minutes, 45 minutes, and 50 minutesRegion B: 35 minutes, 40 minutes and 45 minutesRegion C: 30 minutes, 35 minutes,
and 40 minutesRegion D: 35 minutes, 40 minutes, and 45 minutes A. region A B. region B C. region C D. region D E. regions A, B, C, and D