During a laboratory exercise in class, Wei is asked to observe cells from different organisms. Her teacher asks her to list structures that are found in all cells. Which of the following could be found in all the cells that she studied?
A) cell membrane, cytoplasm, DNA
B) cell membrane, cell wall, DNA
C) cell wall, cytoplasm, DNA
D) cell membrane, centrioles, DNA
Ans: A) cell membrane, cytoplasm, DNA
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In the equation
a. change in population size b. time period c. total births d. total deaths e. change in population size over time
Where in the lymph node do the T cells first encounter antigens presented by dendritic cells?
What will be an ideal response?
Which phenomena drives transpiration in a terrestrial woody plant?
A) evaporation B) gravitropism C) translocation D) photoperiodism
A powerline cut has isolated 50 sowbugs from its original population of 15,000. After only five generations, the new population exhibits dramatic genetic differences from the original one, most likely because:
a) members of a small population tend to die off more quickly, removing alleles from the gene pool. b) gene flow increases in a new environment. c) the new environment is different from the old, favoring natural selection. d) by chance, the allele frequencies of the isolated sowbugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool. e) mutations are more common near a powerline.