There are two types of myofilaments. Thin filaments primarily consist of two intertwining strands of a protein called ______________
a. actin
b. chromatins
c. lamins
d. tubulins
e. lamellae
Answer: a. actin
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Nongonococcal urethritis may be caused by the protozoan ________
A) Chlamydia trachomatis B) Neisseria gonorrhoaea C) Haemophilus ducreyi D) Trichomonas vaginalis
Has this cell undergone meiosis?
a. yes, because there are no duplicated chromosomes b. no, because homologous chromosomes are present c. yes, because homologous chromosomes are not present d. no, because the diploid number is 2
Serotyping of bacteria cannot be used to identify which component?
A. Cell wall B. Flagella C. DNA D. Capsule
The type of selection most likely to act on a well-adapted population in a relatively constant environment is
A) directional. B) artificial. C) stabilizing. D) nonrandom. E) disruptive.