Ultimately, the signal from a peptide hormone is typically conveyed to the effectors in the cell via the transfer of what molecular moiety?
A. H2O
B. Phosphate group
C. Amino acid
D. NO (nitric oxide)
E. Nucleotide
Answer: B
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Technology has introduced a range of specific, rapid tests for identifying and diagnosing infectious disease. While culturing a pathogen from a patient is always advantageous, what disadvantage(s) exist for traditional diagnostic techniques?
A. Critically ill patients may have to wait up to 48 hours for a culture to grow. B. The isolated organism is not the pathogen causing the disease. C. Certain pathogens are not able to be cultured in vitro. D. Some diseases are caused by more than one organism. E. All of the above are valid arguments against traditional diagnostic techniques.
To infect a cell, HIV must
A. bind both CD4 and a cytokine co-receptor. B. bind both CD8 and a cytokine co-receptor. C. bind both CD8 and a class I MHC protein. D. kill cytotoxic T cells and bind CD4.
If a botanist hybridizes two pea plants with purple flowers and a resulting plant produces white flowers, the white flowers are considered a ______ trait.
a. recessive b. regressive c. dominant d. hybrid
Which of the following tools is used to match up chromosome pairs using chemical stains?
A.) meiosis map B.) pedigree chart C.) linkage map D.) karyotype