During this initial period of division in a zygote, there is no increase in the overall size of the embryo.
A. Mitosis
B. Cleavage
C. Meiosis
D. Fertilization
B. Cleavage
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Chromosomal gene exchange is not useful in classification studies because prokaryotes do not reproduce sexually.
Answer the following statement true (T) or false (F)
Giardiasis involves
A. vector transmission. B. symptoms of abdominal pain, flatulence, and diarrhea. C. a protozoan that does not form cysts. D. infection of the large intestine. E. All of the choices are correct.
Which of the following statements most accurately describes a selectively permeable membrane?
a. Solutes are never able to cross the membrane. b. Large molecules are always excluded from crossing the membrane. c. Substances can only pass through the membrane with the help of either active or passive transport proteins. d. Certain solutes move freely across the membrane by simple diffusion while others must be helped across by active or passive transport proteins; some substances are completely excluded from crossing the membrane.
Which of the following cells is living but their nuclei are lost during maturation?
A. guard cells B. companion cells C. meristem cells D. collenchyma E. sieve cells