Small, fishlike marine chordates, pointed at both ends with no distinguishable head, in which the notochord runs the entire length of the nerve cord, are called
A. tunicates.
B. arrow worms.
C. acorn worms.
D. lampreys.
E. lancelets.
Answer: E
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a. activated by an antigen b. major histocompatibility genes are expressed c. activated by the presence of cancerous cells d. plasma cells begin to produce and secrete antibodies e. killer T cells bind to any pathogen
Which type of chemical linkage is the weakest?
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
The dashed line in the accompanying figure represents a(n) ____
a. covalent bond b. ionic bond c. hydrogen bond d. polar covalent bond e. hydrophobic interaction
Which of the following sequences indicates the promoter region of a gene?
a. CAAT b. UAAG c. CTTT d. ACAT e. TAAC