In sickle cell anemia, affected individuals carry ____
a. one of several different nucleotide substitutions
b. the same single nucleotide substitution
c. more than one nucleotide substitution
d. a number of mutant alleles
e. one mutant allele in several genes
b
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The three primary germ layers are formed during
a. fertilization. b. cleavage. c. organ formation. d. gastrulation.
____ join roots to leaves and may be above or underground
a. Vines b. Stems c. Petioles d. Flowers e. Runners
Suppose a pregnant woman took a drug that causes incomplete brain formation during fetal development. When must the woman have taken the drug for this effect to occur?
A) Between the second and third months of development B) Between the seventh and eighth months of development C) In the first month of development D) Between the fifth and sixth months of development E) During labor
Another technique that could be used to demonstrate the organisms shown in Image B is the:
a) Brown and Hopps b) Gridley c) Ziehl-Neelsen d) Dieterle