Which of the following are long-lived lymphocytes reserved for possible future encounters with the same threat?
A. Neutrophils
B. Macrophages
C. Memory cells
D. Effector cells
E. Eosinophils
Answer: C
Biology & Microbiology
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Each version of a gene is called a(n)
a. allele. b. chromosome. c. histone. d. centromere. e. artifact.
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Which of the following occurs during forced expiration?
a. The alveoli inflate. b. The ribs move upward. c. The internal intercostal muscles contract. d. The floor of the thoracic cavity moves downward. e. The pressure increases in the thoracic cavity.
Biology & Microbiology
A random change in the DNA nucleotide base sequence is called a ________
Fill in the blank(s) with correct word
Biology & Microbiology
A flowering plant produces pollen in the
A) anther. B) style. C) stigma. D) fruit. E) ovule.
Biology & Microbiology