Which of the following is the correct sequence of events in an action potential after stimulation of a neuron?
a. K+ move sin; Na+ moves out.
b. Na+ moves in; K+ moves out.
c. Na+ moves in; Ca++ moves out.
d. Na+ moves in; Cl- moves out.
e. K+ moves in; organic anions move out.
Ans: b. Na+ moves in; K+ moves out.
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Which microorganism species is most well-adapted to life on the skin?
A. Malassezia B. Staphylococcus epidermidis C. Streptococcus pyogenes D. Corynebacterium diphtheriae E. Candida albicans
There are three alleles at a specific locus in a population of humans. Alleles D1, D2, and D3 with frequencies 0.42, 0.30, and 0.28 respectively
t or f or cannot determine: This population is triploid. t or f or cannot determine: Allele D1 is dominant. t or f or cannot determine: Individuals with alleles D2 or D3 should mutate to D1 because its high frequency indicates it is advantageous. What will be an ideal response?
What are the products of one turn of the Krebs cycle?
A. 2 CO2, 6 NADH, 2 FADH2, 2 ATP B. 2 CO2, 3 NADH, 1 FADH2, 1 ATP C. 4 CO2, 6 NADH, 2 FADH2, 2 ATP D. 1 CO2, 2 NADH, 1 FADH2, 1 ATP E. 4 CO2, 12 NADH, 4 FADH2, 4 ATP
Which of the following enzymes is responsible for DNA synthesis during replication?
a. deoxyribonuclease b. polymerase c. helicase d. primase e. None of the above