What would result if more than one sperm fertilized an egg?
A. One sperm nucleus would degenerate.
B. twins
C. haploidy
D. parthenogenesis
E. polyploidy
Answer: E
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In normal cells, cell adhesion molecules are partially responsible for the cell's ability to ____
a. migrate to new locations in the body b. recognize other cells as "self" c. exocytosis d. both migrate to new locations in the body and recognize other cells as “self” e. recognize linkages between cells in muscle and bone
The pyramid of energy illustrates
a. the first law of thermodynamics. b. the diminishing of usable energy as it is transferred through an ecosystem. c. that energy can be recycled. d. the biological magnification of materials in an ecosystem. e. the diminishing number of organisms at each trophic level.
If the age-specific fertility rate is such that 100 females of age class x would produce 50 offspring, what is the contribution of age class x to the overall population growth rate?
A. 50 B. 2 C. 0.5 D. 0.75 E. cannot be calculated with this information.
A disulfide bond is formed between _______ residues.
a. cysteine b. glycine c. methionine d. tyrosine