Which layer of the skin is composed of stratified squamous epithelium cells?
a. Epidermis
b. All of these choices have stratified squamous epithelium
c. Hypodermis
d. Dermis
e. None of these choices have stratified squamous epithelium.
a
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A reflex arc differs from other responses to stimuli in that ____________________
a. it occurs without processing within the brain b. no neurons are required to bring about the response c. it involves a lot of integration and signal generation in the brain d. motor neurons are typically not activated
Which of the following is eliminated in rapidly dividing embryonic cells that get smaller with each cell division?
A) G1 phase B) S phase C) G2 phase D) M-phase chromosome separation E) M-phase cytokinesis
L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. C. Enzymes can only recognize a single, specific stereoisomer. D. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form.
Who demonstrated that phage genetic material is DNA and not protein?
A. Chargaff B. Franklin C. Avery, MacLeod, and McCarty D. Hershey and Chase E. Watson and Crick