Which of the following is true concerning the life cycle of a moss?
a. Gametophytes are nutritionally dependent upon sporophytes.
b. Emerging gametophytes arise from germinated spores.
c. The zygote is protected within specialized tissues of the sporophyte.
d. Spores are produced within reproductive bodies called antheridia.
Answer: b. Emerging gametophytes arise from germinated spores.
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What differentiates diagnostic techniques that employ phenotypic (culture-based) methods from those that employ molecular methods?
a. Phenotypic methods are highly sensitive and specific, while molecular methods are not. b. Phenotypic methods examine the growth behavior of a microorganism and the pro-teins, enzymes, or toxins produced, while molecular methods examine the genetic makeup. c. Phenotypic methods are quantitative while molecular methods are not. d. Phenotypic methods are not limited to de-tection of live organisms as are molecular methods.
What is n in tetraploid oysters?
A) 5 B) 10 C) 20 D) 40
The physical location of a particular gene on a chromosome is called:a
an allele. b. a locus. c. a trait. d. a chromatid. e. None of these.
The site of gravity reception in roots is the:a
root apical meristem. b. periderm. c. root epidermis. d. root cap. e. root hair.