What is hemoglobin?

A. A reliable source of oxygen
B. A protein that is colorless when deoxygenated
C. An iron-containing respiratory protein
D. A protein found in invertebrates such as crabs and octopus
E. A by-product of gas exchange


Answer: C

Biology & Microbiology

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Which of the following is true about base excision repair (BER) in bacteria?

A. BER is used to repair abasic sites created by hydrolysis or by DNA glycosylases. B. BER requires the action of a unique exinuclease activity to cleave 5' of the abasic site. C. At the nick created by the nuclease, Pol III can excise the damaged strand by nick translation. D. BER can be used to excise benzopyrene adducts. E. BER requires binding of the MutS protein to identify the abasic site.

Biology & Microbiology

Which type of signal only operates over very short distances?

a. chemical b. tactile c. electrical d. visual e. acoustical

Biology & Microbiology

Why does buoyant force act upward on an object submerged in a fluid

What will be an ideal response?

Biology & Microbiology

_______________ allow for bacterial cells to sense a chemical gradient and respond appropriately.

A) Osmoreceptors B) Photoreceptors C) Aeroreceptors D) Chemoreceptors

Biology & Microbiology