B cells are not phagocytic.
True or false
Answer: True.
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Explain how observing artificial selection provides an inference for natural selection
What will be an ideal response?
Which of the following is not consistent with the theory of natural selection?
1.Individuals in a given population can vary in the specifics of shared traits. 2.Populations have an inherent ability to maintain a constant population size over time. 3.Resources become limited when a population expands. 4.Natural selection explains both the diversity of species and why there is variation within populations.
A student designed an experiment to see if plants grow better when watered with a sugar solution. He divided the plants into six groups, measured the initial height of each plant, and calculated the average height for each group. Once a week for two months, he watered the plants in each group using a different sugar solution for each plant group. At the end of two months, he measured the final height of each plant and calculated the average height for each group. The student’s data are shown in the table below.
Which of these statements explains why the plants in Groups E and F died? A. The high sugar content caused too much water to move out of the root cells. B. The high sugar content caused too much water to move into the root cells. C. The high sugar content prevented the plant from capturing energy. D. The high sugar content clogged the pores in the cell membranes
During which growth phase are bacteria more susceptible to antimicrobial drugs?
A) lag phase B) log phase C) stationary phase D) death phase E) The susceptibility is the same for all phases.