With almost no exceptions, the nitrogen fixers are
A. beans.
B. green plants.
C. insects.
D. mammals.
E. prokaryotes.
E. prokaryotes.
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Which pair correctly associates a biochemical process with the appropriate mineral associated with its use in animals?
A) maintenance of bone â€" calcium B) glucose synthesis â€" iodine C) thyroid hormone synthesis â€" iron D) nucleic acid synthesis â€" sulfur
In an effort to clarify and standardize microbial taxonomy, the International Committee on Systematics of Prokaryotes (ICSP) recommends four criteria to meet a "gold standard" for species assignment. Which of the following is not part of the criteria?
A. Melting temperature of the DNA (reflection of the G+C content) within 58°C B. Bioinformatics ecotype analysis showing similar environmental niches C. Whole genome similarity (as determined by DDH) of at least 70% D. Phenotypic similarity to others microorganisms in the group E. Less than 3% divergence in rRNA gene sequence
All of the following statements describe methods to scan the body for cancer except for one. Select the method that is mismatched.
A. Diagnostic mammograms are detailed scans that look at specific areas of the breast, often after a suspicious lump is found. B. Computerized tomography (CT) scans use radio waves and magnets to obtain a detailed picture of organs within the body. C. Positron Emission Tomography (PET) scans function to examine how cells of the body function. Sugars with a radioactive tracer are introduced to the body. Active cells take up more of the sugar and are therefore more visible on the scan. D. Screening mammograms are routine X-rays of breast tissue for anyone over the age of 40 or those with a previous history of breast cancer.
______ are molecules that stimulate a response by T and B cells.
A) Antibodies B) Antigens C) Interferons D) Platelets