Which of the following is TRUE of spirochetes?
A. they are peritrichous.
B. they are Gram-positive.
C. they are able to penetrate a host's tissues.
D. they are obligate intracellular organisms.
E. they are pleomorphic.
Answer: C
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The portion of an enzyme to which substrates bind is referred to as the
A) substrate complex. B) active site. C) catalytic site. D) junction of van der Waals forces.
The information directing the development of the fertilized egg is provided by ____
a. the egg nucleus only b. the sperm nucleus only c. mRNAs in the egg cytoplasm only d. proteins in the egg and sperm cytoplasm e. the egg and sperm nuclei, mRNAs in the egg cytoplasm, and proteins in the egg cytoplasm
Isotopes of atoms
a. are electrically unbalanced. b. behave the same chemically and physically but differ biologically from other isotopes. c. are the same physically and biologically but differ from other isotopes chemically. d. have the same number of protons but a different number of neutrons. e. are produced when atoms lose electrons
Which of the following is not part of the lymphatic system?
1.adrenal gland 2.spleen 3.thymus 4.tonsils