Humans have 23 chromosome pairs. Other members of the Hominidae, including chimpanzees, gorillas, and orangutans, have 24. What could have caused this difference?
A. Backmutation
B. Deletions
C. Frameshift mutations
D. Fusions
E. Inversions
Answer: D. Fusions
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Retinal in prokaryotes is part of
A) photosynthesis. B) phototaxis. C) light-driven ATP synthesis. D) light-driven ATP synthesis and phototaxis.
Nearly all of the foods we eat come from which group of plants?
A. conifers B. ferns C. cycads D. angiosperms E. bryophytes
Answer the following statements true (T) or false (F)
1.A fever has no defense function, but only acts as a sign that an infection is present in the body. 2.Lymphatic capillaries help to recycle the contents of blood plasma, thus helping maintain homeostasis in the circulatory system 3.The primary immune response produces memory cells that stimulate a faster immune response on a subsequent exposure to the same foreign antigen. 4.Secondary immune responses, to diseases, depend on and follow primary immune responses. 5.Human development is an example of direct development.
Which structure in the accompanying figure is a common site of cancer that can usually be detected by a Pap smear?
a. 4 b. 5 c. 6 d. 7 e. 8