Which of the following happens when you
focus on an object close up?
a. the ciliary muscles contract and the lens
flattens
b. the ciliary muscles relax and the lens bulges
c. the ciliary muscles contract and the lens
bulges
d. the cilliary muscles relax and the lens
flattens
e. more than one of these occur when you
focus on an object close up
C
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Which of the following statements about structural maintenance of chromosomes (SMC) proteins is true?
A. They have four distinct domains: N, C, and two ?-helical coiled-coil domains. B. They are usually dimeric and dimerization forms the ATP-binding site. C. Dimers of SMC proteins are all homodimers having identical subunits. D. Dimerization of SMC proteins creates a molecule with two heads and two ATP-binding sites. E. The ATP bound by SMC proteins is hydrolyzed before the heads come together in the dimer.
The net movement of molecules or ions from a low concentration to a higher concentration is called ____
a. active transport b. facilitated diffusion c. exocytosis d. osmosis e. diffusion
What kind of molecule forms a bilayer that is the basis for all cellular membranes?
A) carbohydrate B) cholesterol C) phospholipid D) protein
How is the information that specifies a protein stored in DNA?
A) in the orientation of the double strands B) in the arrangement of the sugar-phosphate chain C) in the types of chemical bonds holding bases together D) in the sequence of bases