Because of the low penetration power of electrons, samples for transmission electron microscopy must be extremely thin. A(n) ________ is able to cut sections as thin as 20 nm.
Fill in the blank(s) with the appropriate word(s).
ultramicrotome
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On Easter Island in the Pacific Ocean, from
original population of 100 humans the population rose to around 3000. In time, the entire island was under cultivation and eventually the soils became so over cultivated that crops could no longer be grown. People started dying from starvation and disease. This Easter Island population had exceeded its
a. density-independent factors. b. biotic potential. c. logistic growth. d. carrying capacity. e. opportunistic life history
Which of the following lifestyle changes would have the greatest impact on reducing an individual's environmental impact?
A. Reducing the number of children in your household to reach a zero population growth rate. B. Buying a more fuel-efficient vehicle and only using it when you are taking long trips instead of traveling locally. C. Downsizing and moving into a smaller house. D. Reducing your meat consumption to once or twice a week. E. Waiting until later in life to have children and only having one per couple.
A clamp connection is
A. a bypass formed during cell division in basidiomycetes that aids distribution on nuclei. B. the hyphae that hold crustose lichens onto rocks. C. the sticky substance that holds shelf fungi onto trees. D. a ring of hyphae produced by some fungi that is used to snare nematodes. E. the connection of a basidiospore to the basidium.
Which of the following hormones is not involved in the male reproductive system?
A) LH B) progesterone C) testosterone D) FSH