Genetic analysis of longevity in several species has shown that observed longevity in natural populations does not represent the maximum possible longevity that could have been attained via natural selection. What are the implications of this finding?
a. Traits that are responsible for longevity are not under selection.
b. There are constraints on the ability of selection to stop the breakdown of an organism's body.
c. Fitness is maximized at an optimal life span that is lower than the maximum life span.
d. Late-acting mutations are rapidly purged from populations.
C
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A mutation occurs in a gene that encodes a G1 cyclin, such that the protein is unable to bind to its CDK. How will this affect the cell cycle?
A. The cell will be stuck in G1 and will not advance through the cell cycle. B. The cell will replicate its DNA, but will be unable to progress through mitosis. C. The cell will rapidly replicate its DNA and progress through mitosis, causing uncontrolled cell division, and leading to cancer. D. The cell will proceed thru mitosis without replicating its DNA. E. The cell will proceed to the S phase, and DNA repair enzymes will repair the mutated cyclin when it replicates the DNA.
Biodiversity hotspots are defined as areas where biodiversity is both ____ and ____
a. concentrated; endangered b. researched; protected c. low; increasing d. overexploited; studied e. low; declining
Chemical digestion occurs when our teeth chew food into pieces convenient for swallowing.
Indicate whether the statement is true or false.
An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration
What is the birth rate per year for this population? A) 20 B) 60 C) 40 D) 0.4 E) 0.6