Nitrate and ammonium are usable forms of nitrogen that plants absorb with their
A. roots.
B. stomata.
C. roots and leaves.
D. leaves.
E. stomata and leaves.
A. roots.
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The method of choice for sterilizing items such as antibiotic solutions, chemicals, radioisotopes, and vaccines that are heat-sensitive is:
a. dry, low temperature heat. b. moist, low temperature heat. c. filtration. d. chemical.
Which situation describes potential observer bias in an experimental process?
A) Dr. Jones is evaluating cancer patients for their responses to a new therapeutic drug. She knows which patients are receiving the placebo and which are receiving the drug. B) Mr. Bromley is conducting a survey of weight loss for his professor. He asks each student in the study the same questions. C) Ms. Bradley is an outside consultant who is conducting a health and wellness survey for a pharmaceutical company. She does not know the name of the company nor does she know the name of the drug being tested during the survey. D) Dr. Postgate is analyzing biopsy samples from rats that have been given either a placebo or an experimental drug believed to reduce inflammation. Each sample is identified by a code number so that Dr. Postgate cannot tell which treatment the rats received.
Probes that bind under very stringent hybridization conditions resulting in the differential binding over one nucleotide are called ________
A) allele-specific oligonucleotides (ASOs) B) generation-specific probes C) short, variable repeats D) VNTRs E) microsatellites
Extinction of a species means that:
a. all members of the species have died out and have left no descendents. b. researchers are unable to find individuals of the species in nature. c. members of the species are not reproducing. d. the species has died out in part of its geographic range.