The number of currently described species on the planet is about ________.
a) 17,000
b) 150,000
c) 1.5 million
d) 10 million
Ans: c) 1.5 million
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Which of the following is the neurotransmitter that is released at the neuromuscular junction?
A. epinephrine B. dopamine C. norepinephrine D. acetylcholine
A hypothetical family of proteins consists of six similar but different proteins. Each of the six proteins can form transcription factors by forming homo- or heterodimers in combinatorial mixtures, each binding to different regulatory sites
Calculate the number of different dimeric structures that can be formed from the six proteins (and, thus, potential number of different regulatory sites that can be bound).
Which one of the following blood types can a person with blood type B safely receive in a blood transfusion?
A) A B) B C) AB D) O E) B and O
Answer the following questions true (T) or false (F)
1. Bacteria store their DNA within a spherical nucleus. 2. When bacteria undergo binary fission, they produce identical daughter cells. 3. Most bacteria present in the human intestines are pathogenic.