The human immunodeficiency virus (HIV) selectively infects any cell which carries the CD4 surface glycoprotein. Which immune function will be impaired?
A) stimulation of macrophage, B and TC cells
B) stimulation of macrophage activity
C) stimulation of B cells and antibody production
D) stimulation of Tc cells and destruction of virally-infected cells
E) stimulation of B and Tc cells but not of macrophage
Answer: A
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The female gametophyte in flowering plants is usually consists of
a. a complete pistil. b. seven cells embedded in floral tissues. c. a single ovary. d. a seed. e. shoot parts bearing female flowers.
The ABO blood types are an example of ____.
A. pleiotropy and polygenic inheritance B. multiple alleles and continuous variation C. incomplete dominance D. codominance and epistasis E. multiple alleles and codominance
An unusual red sponge is discovered near a deep-sea vent. You want to determine if this is a new species of sponge, so you separate the cells for further study. A new lab assistant accidentally adds cells from a blue sponge to your preparation while you are at lunch. When you return, you find that the sponge cells have reaggregated into a multicellular organism. What do you see if the red and blue sponges are the same species?
A. one sponge with blue and red randomly distributed B. one blue sponge and one red sponge C. one purple sponge (mix of red and blue colors) D. one sponge with a red side and a blue side E. one sponge with alternating red and blue layers of cells
DNA ligase ________
A) removes bases from a DNA molecule B) adds bases into a growing DNA molecule C) reconnects the bases together between the DNA strands D) cuts the DNA to produce sticky or blunt ends E) reconnects the phosphodiester linkage between bases on the same strand of DNA