One of the major causes of panda bears
becoming endangered is
a. habitat loss and fragmentation.
b. increasing the effects of chemical pollution.
c. a sexually transmitted disease that plagues
the bears.
d. introduced exotic species into a habitat.
e. all of these.
A
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Which of the following is likely required to initiate cell differentiation during development?
A. cell division B. the presence of certain mRNAs needed for expression of cell-specific proteins C. the buildup of cell-to-cell adhesion molecules D. the presence of carbohydrates E. hydration of the egg during fertilization
Mistletoe is a plant that grows in the branches of trees. Its roots penetrate the bark of the tree, allowing it to obtain water and nutrients. The tree is harmed, and can even die as a result of this interaction. This is an example of
A. commensalism. B. herbivory. C. parasitism. D. predation. E. mutualism.
Respond to statements 116–120 in reference to the five stages or
structures involved in the development of the human egg. a. oogonium b. primary oocyte c. secondary oocyte d. polar body e. corpus luteum M 116. This structure becomes the mature egg only after fertilization is begun. D 117. This structure contains the first sex cell stage to be in the haploid state. M 118. This structure contains a full haploid set of chromosomes but will never be fertilized. M 119. This structure divides by mitosis during the fetal stages of development until all of the approximately two million potential eggs have been formed. D 120. This stage lies dormant between birth and puberty.
What are Naegleria and Acanthamoeba's portal of entry?
A) Contaminated food or drinking water B) Contaminated swimming areas-lakes, ponds