All of the following choices delay or block expression of a gene except ________
a. expression of a microRNA complementary in sequence to the gene
b. the binding of a repressor to certain sites on DNA
c. methylation of DNA
d. the binding of an activator to a promoter
d
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Attributes of Welwitschia mirabilis include
_____ It has only two leaves. _____ It obtains most of its water from seasonal heavy rains. _____ It lives under desert conditions. _____ It is a gnetophyte. _____ Its stems are photosynthetic, but its leaves are not.
Which of the following organs serves as a transition between the pharynx and the trachea?
a. nasal cavity b. bronchi c. larynx d. alveoli
How does cytokinesis in plant cells differ from that of animal cells?
A. The endoplasmic reticulum forms a cell plate. B. Microtubules are constructed into a cell plate pattern. C. The Golgi apparatus produces vesicles that migrate along microtubules and fuse to make a cell plate. D. The plasma membrane divides by cytokinesis as in animal cells, and then secretes a cellulose cell wall.
Hari is experiencing intense pain in one point in his body. Maryam has the perfect solution! She has a wonderful drug that is guaranteed to take away all pain, and she wants Hari to take it before going to the doctor. Why should Hari not take the drug,
according to the information in this chapter? What will be an ideal response?