The metabolic feature that defines Thaumarchaeota is ________.
What will be an ideal response?
ammonia fixation, ammonia-fixatio, nitrification, ammonia oxidation
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The preferred host of Ixodes scapularis is the
A. wood rat. B. white-footed mouse. C. moose. D. human.
Although the genetic contributions of egg and
sperm nuclei are equal, the egg contributes more than the sperm to cell differentiation because of its
a. larger size. b. cytoplasmic determinants. c. proteins. d. cytoplasmic determinants and proteins only. e. cytoplasmic materials, enzymes, mRNA transcripts, and larger size
During the pre-embryonic period, a single sperm passes through the zona pellucida. In the vast majority of cases, where does this process occur?
A) in the uterus B) in the ovary C) in the oviduct (fallopian tube) D) in the placenta
Which of the following enzymes is found ONLY in hyperthermophiles?
a. topoisomerase I b. reverse DNA gyrase c. helicase d. DNA polymerase III