Population size declines when ________
a. the sum of births and immigration is less than the sum of deaths and emigration
b. death rates are higher than birth rates
c. immigration is higher than emigration
d. the value for r is greater than 0
a
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If E. coli bacteria are grown in the absence of lactose, then the repressor will
A. not bind the operator, allowing transcription of the lac operon genes. B. bind the operator, allowing transcription of the lac operon genes. C. not bind the operator, preventing transcription of the lac operon genes. D. bind the operator, preventing transcription of the lac operon genes.
Many biologists feel that the first self-replicating organic systems were
a. types of RNA. b. forms of DNA. c. based on proteins. d. formed in space. e. plants.
Single strand breaks don't typically lead to mutations or cell death.
a. true b. false
The epithelial tissue of animal cells is most similar to the ________ of plant cells?
A. xylem B. phloem C. dermal D. ground E. vascular