Mendel kept detailed records of the genetic traits of parent plants and their offspring plants. Among observations, he found that some traits would be expressed, whenever one particular allele was present, and called this allele Select one:
a. homozygous.
b. dominant.
c. recessive.
d. homologous.
e. heterozygous.
b. dominant.
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Secondary endosymbiosis occurs when a ____ eukaryote engulfs a ____
a. photosynthetic; photosynthetic prokaryote b. photosynthetic; non-photosynthetic prokaryote c. photosynthetic; non-photosynthetic eukaryote d. non-photosynthetic; photosynthetic prokaryote e. non-photosynthetic; photosynthetic eukaryote
Bacteria that cause tooth decay can lead to ____
a. diarrhea b. constipation c. hepatitis d. gingivitis e. gastritis
A second encounter with an allergen that causes a response is called the ________ dose.
A. desensitizing B. provocative C. allergic D. sensitizing E. hypersensitivity
Nitric oxide is a signal molecule that can
a. bind to surface receptors and activate second messengers. b. bind to surface receptors and open ion channels. c. diffuse across cell membranes and bind to receptors that regulate transcription. d. diffuse across cell membranes and directly alter the activity of intracellular enzymes.