DNA and histones form beadlike globules known as __________.
Fill in the blank(s) with the appropriate word(s).
Ans: nucleosomes
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Which of the following statements about ocean acidification is false?
A. Ocean acidification increases the availability of carbonate ions in seawater. B. Increasing levels of CO2 in the ocean cause a decrease in the pH of seawater. C. The pH of surface oceans has dropped by 0.1 units in the past 40 years. D. Ocean acidification makes it more difficult for corals to secrete their skeletons. E. Ocean acidification is predicted to get worse as atmospheric CO2 levels rise.
The ____ is an accessory system of vessels and organs that helps balance the fluid content of the blood and surrounding
tissues.
a. circulatory system b. non-circulatory system c. accessory vessel system d. lymphatic system e. heart
Which carbon(s) in the pentose sugar in RNA and DNA is/are covalently linked in a phosphodiester bond?
a. the 1' carbon b. the 2' and 5' carbons c. the 1' and 3' carbons d. the 3' and 5' carbons
Which statement regarding the nervous system is true?
A) Sensory neurons convey signals from the central nervous system (CNS) to sensory receptors. B) Motor neurons convey signals from the CNS to effector cells. C) The peripheral nervous system (PNS) is composed entirely of nerves. D) The CNS includes the brain and peripheral nerves.