Which of the following organisms represent a K-selected species?
A) whales B) grasshoppers C) salmon D) houseflies
Answer: A
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Mature human sperm cells
A. are spermatozoa. B. are secondary spermatocytes. C. are oocytes. D. are primary oocytes. E. undergo meiosis.
The student who caught the cold caused by this specific Rhinovirus was exposed to the exact same Rhinovirus 18 months later. What component of the immune system will protect her from getting the same cold again?
a. Plasma cells b. Antibodies that are "left over" from the last infection c. Dendritic cells d. Memory B cells
Desulfovibrio bacteria can perform the following reaction: S6- S2-. These bacteria are
a. Synthesizing sulfur. b. Reducing sulfur. c. Hydrolyzing sulfur. d. Oxidizing sulfur.
Which of the following statement concerning structural genes is FALSE?
a. Most structural genes encode a single polypeptide. b. Coding regions always contain introns. c. There may be noncoding regions at the end of the gene. d. A single DNA sequence can sometimes code for more than one polypeptide. e. All of the above are true