Which of the following is an example of a subunit vaccine?
A) The surface protein of a virus is used to make the vaccine.
B) The virus is exposed to ultraviolet light.
C) The virus is exposed to formaldehyde.
D) The virus is grown in a host other than humans and thus grows more slowly than normal.
Answer: A
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In the life cycle of bryophytes and seedless vascular plants, meiosis takes place in the
a. gametophyte. b. sporangium. c. archegonium. d. zygote. e. antheridium.
Tortoises colorizing the different Galapagos islands and evolving into different species is an example of ______ speciation.
A. prezygotic B. allopatric C. postzygotic D. sympatric E. outgroup
Diffusion is an example of ________
A) phagocytosis B) active transport C) endocytosis D) passive transport
Answer the following questions true (T) or false (F)
1. Cleavage and gastrulation take place in animals such as humans and birds but not in frogs. 2. Early vertebrate embryos share a general similarity in shape in the period following somite development. 3. Cells first arrange themselves into layers during organogenesis.