Which organelle contains enzymes that break down macromolecules, old organelles, and invaders?
Mitochondrion
Nucleus
Endoplasmic reticulum
Lysosomes
D. Lysosomes
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The photic zone in aquatic environments is typically about how deep?
A. 10 m B. 50 m C. 100 m D. 500 m E. 1000 m
Evolutionary biologists believe that females prefer attractive mates mainly because ____
a. attractive mates confer status in hierarchical societies b. attractiveness is a predictor of good performance and survivorship c. ornaments such as bright plumage stimulate her visual system d. superior ornaments deter rival males e. a sense of aesthetics is shared by both higher animals and humans
The infinite variety of antibodies that can be generated by B cells is due to:
a. the infinite variety of genes in these cells b. the use of gene segments to produce an infinite variety of proteins c. the recombination of genes due to crossing over d. random mutations e. modifying the protein after an antigen is detected
A patchy distribution of an essential resource leads to a(n) ____ population distribution
a. clumped b. random c. uniform d. exponential e. logistic