Nucleic acids are polymers of , which are molecular complexes of three subunits: a phosphate, a sugar, and nitrogen base.
A. Nucleotides.
B. Nucleosides.
C. Nuclei of heavy metals.
D. Proteins.
Ans: A. Nucleotides.
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Which of the following cells stop dividing once fully formed?
a. bone cells b. cheek cells c. liver cells d. muscle cells e. nerve cells in the brain
Additional observations were made on day 21, and no yellow-leaved seedlings were found alive in either dish. This is most likely because
(A) yellow-leaved seedlings were unable to absorb water from the paper towels (B) taller green-leaved seedlings blocked the light and prevented photosynthesis (C) yellow-leaved seedlings were unable to convert light energy to chemical energy (D) a higher rate of respiration in yellow-leaved seedlings depleted their stored nutrients
Sickle-cell anemia results from a point mutation in the HBB gene. The mutation results in the replacement of an amino acid that has a hydrophilic R-group with an amino acid that has a hydrophobic R-group on the exterior of the hemoglobin protein. Such a mutation would most likely result in altered
(A) properties of the molecule as a result of abnormal interactions between adjacent hemoglobin molecules (B) DNA structure as a result of abnormal hydrogen bonding between nitrogenous bases (C) fatty acid structure as a result of changes in ionic interactions between adjacent fatty acid chains (D) protein secondary structure as a result of abnormal hydrophobic interactions between R-groups in the backbone of the protein
which is true about parasomnias?
-parasomnias occur more frequently in children -in parasomnias, the undesirable events occur when brain is in REM sleep -parasomnias are a sign of psychopathology -parasomnias are uncommon