Clonal selection results in the formation of:
A. plasma cells.
B. memory cells.
C. secreted antibody.
D. All of the answer options are correct.
D
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A recessive trait is expressed when the genotype is _______________
A. homozygous dominant or heterozygous B. homozygous recessive or heterozygous C. heterozygous only D. homozygous dominant only E. homozygous recessive only
The type of epithelial tissue you would expect to find lining the upper respiratory tract is:
a. pseudostratified columnar epithelium. b. simple squamous epithelium. c. ciliated columnar epithelium. d. stratified squamous epithelium. e. ciliated squamous epithelium.
Which of the following statements is correct for stomata opening?
a) Stomata take up K+ into their guard cells, which attracts water to enforce their opening. b) Stomata export K+ from their guard cells, which causes water to diffuse out, and that is the trigger for stomata to open up. c) Na+ is the main ion source to control stomata opening in plants. d) Most critical is the closing of aquaporins in the cell wall of guard cells to open up stomata. e) Stomata have small muscles that contract and open up the kidney shaped guard cells.
The HIV genome contains nine genes, and therefore encodes just nine proteins
Indicate whether the statement is true or false