A genotype refers to
A) the alleles present in an individual.
B) expression patterns of certain genes.
C) the environmental components of a trait.
D) the number of chromosomes that a person has.
A) the alleles present in an individual.
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The receptors for steroid hormones are located inside the cell instead of on the membrane surface like most other signal receptors. This is not a problem for steroids because _____
A) the receptors can be readily stimulated to exit and relocate on the membrane surface B) steroids do not directly affect cells but instead alter the chemistry of blood plasma C) steroid hormones are lipid soluble, so they can readily diffuse through the lipid bilayer of the cell membrane D) steroids must first bond to a steroid activator, forming a complex that then binds to the cell surface
During oxygenic photosynthesis, water is ________________ and loses electrons (i.e., it serves as an electron donor)
A. converted B. reduced C. oxidized D. transformed
The special functions performed by membranes are the result of
a. the number of layers of phospholipids present. b. concentration gradients of the interior contents. c. lipids embedded in the protein layer. d. steroids. e. proteins in the lipid bilayer.
Which lower respiratory tract disorder can be cured through the use of antibiotics that are effective against bacterial infections?
A. Pneumonia B. Strep throat C. Emphysema D. Asthma