If a single gene has 3 or more alternative forms, this is called
A. pleiotropy.
B. multiple alleles.
C. epistasis.
D. blending inheritance.
E. codominance.
B. multiple alleles.
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Where does the Calvin cycle occur?
a. thylakoid membrane b. thylakoid lumen c. stromal lamellae
d. cytosol e. stroma
The relative impermeability of membranes to water soluble molecules is a result of the ____
a. nonpolar nature of water b. presence of large proteins that extend through both sides of membranes c. presence of inorganic salt crystals scattered through some membranes d. presence of cellulose and waxes e. presence of phospholipids in the lipid bilayer
The primary difference between enhancers and promoter-proximal elements is that enhancers _____
A) are transcription factors; promoter-proximal elements are DNA sequences B) enhance transcription; promoter-proximal elements inhibit transcription C) are at considerable distances from the promoter; promoter-proximal elements are close to the promoter D) are DNA sequences; promoter-proximal elements are proteins
Most of the interior of a leaf consists of soft, thin-walled, living ________ cells
A) parenchyma B) collenchyma C) epidermal D) sclerenchyma E) guard