Which of the following is not a greenhouse gas?
A. hydrofluorocarbons
B. nitrous oxide
C. oxygen
D. methane
E. carbon dioxide
Answer: C
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Based on the figure from the section on HIV replication, why could researchers use PCR to amplify viral DNA from the chimp Marilyn's tissues?
A. PCR can amplify any genetic material.
B. HIV uses DNA as its genetic material.
C. PCR uses a reverse transcriptase and can thus detect RNA.
D. HIV is converted to DNA and integrated into a cell's chromosome.
E. Some of the HIV will be stuck to the outside of a cell.
Which of these ecosystems has the lowest productivity?
A. temperate forest B. open ocean C. savanna D. lakes E. tropical forest
Labeling.
?
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Figure 31.14
A. hair B. duct of sweat gland C. blood vessels D. smooth muscle E. sweat gland F. hair follicle G. sebaceous gland H. hypodermis I. dermis J. epidermis
The mechanism that "breaks" the linkage between linked genes is
A) pleiotropy. B) codominance. C) independent assortment. D) crossing over.