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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Which of the following diseases is not caused by viruses?

A. smallpox B. polio C. warts D. diabetes E. influenza

Biology & Microbiology