Polytene chromosomes form in some types of cells that
a. have a lot of chromosomes
b. are making a lot of protein
c. are differentiating
d. are making a lot of protein and are differentiating
B
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In Drosophila, the hunchback gene encodes a protein (HB) that is required in the correct concentrations for proper segmentation of the embryo. In the zygote and embryo, the expression of hunchback is stimulated by high concentrations of Bicoid protein. You manipulate a Drosophila embryo to have high Bicoid concentrations throughout. Which of the following would occur?
A. The HB protein would be produced throughout the entire embryo. B. The HB protein would not be produced at all. C. The HB protein would be produced throughout the entire embryo and segmentation would not occur correctly. D. The HB protein would not be produced at all and segmentation would not occur correctly. E. Segmentation would not occur correctly.
Nitrogen can be obtained from either organic or inorganic sources.
Answer the following statement true (T) or false (F)
The species richness of high-latitude communities is __________ compared with that of low-latitude
communities. a. low b. high c. no different d. more dense e. complex
In humans, X-linked traits:
a) occur on the X-chromosome. b) are passed from fathers to their sons. c) tend to skip generations. d) occur more frequently in females. e) All of the above are true.