Populations can be divided into three ecologically important age classes: prereproductive, reproductive, and ________
Fill in the blank(s) with correct word
postreproductive
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In a muscle contraction, the Z lines of a
sarcomere are ___.
a. closer together but not overlapping b. further apart c. the same distance as when not contracting d. thicker e. overlapping
During exhalation,
a. the pressure in the thoracic cavity is less than the pressure within the lungs. b. the pressure in the thoracic cavity is greater than the pressure within the lungs. c. the diaphragm moves downward and becomes more flattened. d. the chest cavity volume increases. e. movement of the diaphragm is inhibited.
What evidence supports the hypothesis that the nuclear envelope of eukaryotes arose from infolding of the plasma membrane?
A. Eukaryotes and prokaryotes differ in control of gene expression. B. No modern bacteria have infolded plasma membranes. C. The nuclear membrane allows separation of transcription and translation. D. The nuclear membrane and endoplasmic reticulum (ER) of modern eukaryotes are continuous.
The term gene expression refers to the
A) fact that each individual of a species has a unique set of genes. B) fact that individuals of the same species have different phenotypes. C) process by which genetic information flows from genes to proteins. D) flow of information from parent to offspring.