Which tissue cannot divide to give rise to identical progeny in a plant that reproduces asexually?
A. Root
B. Stem
C. Leaf
D. Ovule
E. Pollen grain
Answer: E
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The site on the DNA to which a repressor protein binds is the ________.
A. regulator B. operator C. operon D. promoter
Class II MHC are found on
A. the skin. B. red blood cells. C. cytoplasmic membranes of nucleated cells. D. muscle cells. E. professional antigen-presenting cells.
Which of the following is not a characteristic of Bicoid protein?
A. Bicoid is a maternal gene product. B. Throughout the first seven nuclear divisions, Bicoid concentration is higher in the anterior pole than the posterior pole. C. Bicoid represses Hunchback in the posterior pole. D. Bicoid is a transcriptional activator of many segmentation genes.