The existence of discrete variants of a particular character is known as ____
a. homozygous dominance
b. a quantitative trait
c. genotypic variation
d. a polymorphism
e. genetic equilibrium
ANSWER: d
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A nucleic acid contains uracil, allowing you to conclude that:
A. this nucleic acid is DNA. B. this nucleic acid is RNA. C. this nucleic acid could be either DNA or RNA.
The bacterium E. coli swims in a straight line, called a ________, for a few seconds; then it stops, tumbles, then swims away in a new direction.
Fill in the blank(s) with the appropriate word(s).
Which statement about antigen recognition in B and T cells is TRUE?
A) B cell antigen receptors can bind to intact freely circulating antigens that are bound to self proteins. B) T cell antigen receptors can bind to intact antigens that are bound to self proteins. C) B cell antigen receptors can bind to intact antigens that are on pathogen surfaces. D) T cell antigen receptors can bind to intact freely circulating antigens.
Which of the following features is NOT associated with Alzheimer's disease?
A. Neurofibrillary tangles surround the nucleus of the neural cells. B. The most common cause of dementia in older adults. C. Plaques accumulate along the axons of the neurons in the brain. D. A loss of reasoning and memory. E. All of these are features of Alzheimer's disease.