You see a killifish jumping around on the surface before it is consumed by a bird. You conclude the fish was
A) trying to scare off the predator.
B) hunting for flying insects.
C) infected with a trematode.
D) starving to death.
C
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Centromeres are:
A. sequences on the eukaryotic chromosome that function as an attachment point for proteins linking the chromosome to the mitotic spindle. B. sequences at the ends of the eukaryotic chromosome that add stability to linear DNA sequences. C. the sites at which replication initiates in bacteria. D. sequences in the bacterial chromosome at which the kinetochore forms. E. GC-rich sequences that code for the proteins forming the kinetochore.
Which statement concerning phytochrome-induced responses is false?
a. All responses are very rapid and short-term. b. Red light causes potassium channels to open. c. The absorption of light by one part of the phytochrome molecule triggers a conformational change in another part. d. Phytochrome activates transcription of the gene for a subunit of rubisco. e. Far-red light causes potassium channels to close.
Which of the following statements is false regarding mammals?
A. Mammals’ lower jaw consists of a single bone. B. Mammals have distinctive skeletal and dental traits. C. The mammalian heart is three-chambered. D. Mammals are animals in which females nourish their offspring with milk that they secrete from mammary glands. E. Mammals also include the only animals that sweat.
A "stitch" in the side experience during vigorous exercise is due to the contraction of the liver as it releases additional blood into the bloodstream.
Indicate whether the statement is true or false.