When observing a bird skin cell in G2 under a microscope, you count 160 total chromatids. How many chromosomes does a male chicken have in its sperm cells?
A) 320
B) 160
C) 80
D) 40
Answer: D
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Which curves on the graphs may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70 °C or higher?
A) curves 1 and 5 B) curves 2 and 4 C) curves 2 and 5 D) curves 3 and 4 E) curves 3 and 5
Choose the true statements about the initiation of limb development in tetrapods.
_____ Forelimbs in birds and humans are analogous structures. _____ The development of homologous limbs in different species involves the activation of all the same genes. _____ Like Brachyury, Tbx5 has a T-box domain that codes for a transcription factor. _____ Tbx5 encoded protein turns on genes that initiate limb development.
Which of the following diseases is not caused by viruses?
A. smallpox B. polio C. warts D. diabetes E. influenza
Any individual organism has the potential to evolve if it's given enough time and possesses a mechanism to generate variation
Indicate whether the statement is true or false