a. a diploid zygote
a. a seed plant with seeds exposed on modified leaves
b. a structure that produces vessels in woody tissue
c. a sac-like structure at the tip of the stamen
d. a seed plant with small spores that produce gametophytes
a. a seed plant with seeds exposed on modified leaves
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Which of the following characteristics distinguishes birds from reptiles?
a. Reptiles have only one single middle ear bone, while birds have two or more. b. The shape of their occipital condyles allows birds to rotate their heads more than reptiles can. c. Birds are endothermic. d. Birds and reptiles have distinctly different jaw bone morphologies.
Nephridia are
a. circulatory organs. b. respiratory organs. c. excretory organs. d. endocrine organs. e. part of the nervous system
The only known source of human embryonic stem cells is:
a. placental tissue. b. umbilical cords. c. early human embryos. d. brain tissue. e. nerve tissue.
A DNA molecule that enters a bacterium by one of several mechanisms is called a(n) ________.
A. exogenote B. endogenote C. merozygote D. None of the choices are correct.