A waxy cuticle helps prevents desiccation. What is the cost of this adaptation?
A. Increased exposure to damaging UV radiation
B. Lowered light absorption
C. Reduced gas permeability
D. Increased susceptibility to pathogenic infection
E. Slower H2O transport
Answer: C
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The nucleus is to eukaryotes as the ________ is to prokaryotes.
A. pili B. glycocalyx C. ribosome D. nucleoid E. cell wall
What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?
A. contact-to-contact signaling B. intercellular signaling C. autocrine signaling D. paracrine signaling E. endocrine signaling
In _____ selection, individuals intermediate in a phenotypic distribution have greater reproductive success.
A. stabilizing B. directional C. disruptive D. balancing E. negative frequency-dependent
Suppose that 100 pollen grains land on a stigma, and 50 mature seeds are formed in the fruit. What does this indicate about the pollination process and success?
A) 50% success: 100 pollen grains grew to 50 ovules, and double fertilization occurred. B) 50% success: evidently, only 50 sperm pollinated 50 anthers. C) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 50 polar nuclei. D) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 100 polar nuclei.