Which of the following is not an endocrine gland?
A. pineal
B. duodenum
C. pituitary
D. thymus
E. adrenal
Answer: B
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What is the correct order of visual information?
a. Pigment absorbs light - signal flows to the neuron - signal moves to the optic nerve- signal moves to the ganglion b. Pigment absorbs light - signal moves to the optic nerve - signal moves to the ganglion - signal flows to the neuron c. Pigment absorbs light - signal flows to the neuron - signal moves to the ganglion - signal moves to the optic nerve d. Signal flows to the neuron - signal moves to the ganglion - signal moves to the optic nerve- pigment absorbs light e. Signal moves to the optic nerve - pigment absorbs light- signal flows to the neuron - signal moves to the ganglion
Plastics that wash into waterways cause problems mainly because they:
a. clog gills of fish b. are mistaken for food by marine animals c. are unsightly d. leach toxins e. disturb water flow patterns
Why do pseudogenes evolve so much more quickly than other genes?
A. High rates of recombination in pseudogenes are often subject to unequal crossing over. B. Pseudogenes are processed more quickly because there are no enzymes present to check for replication errors. C. Transposable elements target pseudogenes as a site of insertion. D. They are not subject to purifying selection because mutations have no functional consequence. E. Directional selection causes rapid change in their sequence.
Sometimes, chemical damage to DNA can occur just before DNA replication begins, not giving the repair system enough time to correct the error before the DNA is duplicated. This gives rise to mutation
If the cytosine in the sequence TCAT is deaminated and not repaired, which of the following is the point mutation you would observe after this segment has undergone two rounds of DNA replication? (a) TTAT (b) TUAT (c) TGAT (d) TAAT