If a pedigree of several generations shows only females affected by a particular trait, what can be ruled
out?
A. Autosomal recessive inheritance D. X-linked recessive inheritance
B. X-linked dominant inheritance E. None of these can be ruled out
C. Y-linked inheritance
C
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When assembling a fish aquarium one must add a conditioner to the water that contains bacteria capable of metabolizing fish waste such as ammonia, nitrate, and nitrite that accumulates in the aquaria water. Which of the following components of signal reception and transduction is NOT required for the bacterial two-component regulatory system for metabolizing these nitrogenous waste products?
A. NarQ receptor B. NarL transcriptional activator C. a protein kinase D. metabolic enzymes E. ligand-gated calcium channel
RNA polymerase moves in a direction that reads the bases of the DNA sequence from the 3' end toward the 5' end and make the RNA transcript from the 3' to the 5' end.
Answer the following statement(s) true (T) or false (F)
There are an estimated __________ deaths per year
in the United States from lung cancer among nonsmokers who associate with smokers. a. 1,000 b. 1,500 c. 2,000 d. 2,500 e. 3,000
There is still some controversy among biologists about whether Neanderthals should be placed within the same species as modern humans or into a separate species of their own. Most DNA sequence data analyzed so far indicate that there was probably little or no gene flow between Neanderthals and Homo sapiens. Which species concept is most applicable in this example?
A) phylogenetic B) ecological C) morphological D) biological