Skeletal muscle contractions are under the control of
A. exocrine glands.
B. the endocrine system.
C. the endocrine and exocrine systems.
D. the nervous system.
D. the nervous system.
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Avery, MacLeod, and McCarty (1944) demonstrated that DNA was the genetic material by treating heat-killed Streptococcus pneumoniae S (smooth) strain with DNase,
thereby preventing transfer of the "transforming substance" from the killed S strain to the live R (rough) strain when the two were mixed together and injected into mice. Another way that one could demonstrate transformation in bacteria would be to extract DNA from A) an R strain and mix it with cells of an S strain. B) both S and R strains and mix it to allow recombination to take place. C) an ampicillin-sensitive strain and mix it with cells of an ampicillin-resistant strain. D) an S strain and mix it with cells of an R strain. E) None of the above are correct.
How are the nucleotide monomers connected to form a polynucleotide?
a. hydrogen bonds between complementary nitrogenous base pairs. b. ionic attractions between phosphate groups c. disulfide bridges between cysteine amino acids. d. covalent bonds between the sugar of one nucleotide and the phosphate of the next e. ester linkages between the carboxyl group of one nucleotide and the hydroxyl group on the ribose of the next
A single cell, the zygote, can develop into an entirely new organism with many different specialized cells. Which of the following statements about this process is false?
A) Additional genetic information for the formation of specialized cells is passed on to the developing embryo via the mother. B) The descendant cells specialize by a process known as differentiation. C) The zygote contains all of the genetic information required for the development of many different cell types. D) Differentiation of the zygote into a multicellular organism results from selective gene expression.
T or F: lateral flexion applies to only to the movement of the head or trunk
What will be an ideal response?