Cytoplasmic determinants are ____
a. key mRNA and proteins stored in the sperm cytoplasm that direct the early stages of development
b. key mRNA and proteins stored in the egg cytoplasm that direct the early stages of development
c. evenly distributed throughout the egg cell
d. distributed symmetrically to daughter cells
e. proteins from the egg and sperm cytoplasm that interact to form novel protein complexes in the zygote
ANSWER: b
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Upon finding a carcass, a raven will only call and attract other ravens to the food source if the ____
a. nearby ravens are relatives b. food source is large and plentiful c. food is found in a resident pair's territory d. food is found in his own territory e. food is being consumed by an animal of another species
Arrange the steps of an allergic response in the proper order
1) Allergic symptoms appear. 2) Allergen binds with IgE. 3) IgE combines with mast cell receptors. 4) Mast cells release histamine. 5) Plasma cells sensitized.
a. 5, 3, 2, 4, 1 b. 1, 5, 2, 4, 3 c. 5, 2, 4, 3, 1 d. 1, 4, 5, 2, 3 e. 4, 5, 2, 3, 1
The primary advantage of genotypic analysis for identification is that
A. it is less expensive than other methods. B. it is easier than any other method. C. culturing of the organism is not required. D. it is widely available.
The term tetrapod refers to amphibians, reptiles, birds and mammals
a. true b. false