Which of the following statements about muscles is correct?
A. Smooth muscles contract more slowly than
skeletal muscles.
B. Actin and myosin are arranged irregularly
in cardiac and smooth muscles.
C. Skeletal muscles are striated, whereas
cardiac muscles are not.
D. Striated muscles use actin and myosin to
generate force, whereas smooth muscles do
not.
E. Cardiac muscles are found in the heart
and the walls of the arteries.
A
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To which labeled region in the figure is a covalent bond formed between a nucleotide and an amino acid?
A. (A) B. (B) C. (C) D. (D) E. (E)
Spindle fibers
a. are composed of DNA. b. only appear during interphase. c. attach to the ends of chromosomes. d. connect chromosomes to the center of the cell. e. are used to organize and move chromosomes during mitosis.
In which of the following ways has climate change impacted weather patterns in the United States?
A. Average temperatures have increased up to 1.8°F; however, these changes have been very regional, with some areas seeing increasing temperatures and others seeing decreasing temperatures. B. Average precipitation has increased by 4%; however, this has been a very regional change, with some areas seeing significant increases in rainfall and other areas seeing significant decreases in rainfall. C. Severe weather events, including droughts and flooding, have decreased in frequency. D. Geological events, including volcanoes and earthquakes have increased in frequency.
The genome is all the individual's
A. DNA. B. mRNA. C. tRNA. D. All of these answers are true.