Please match the cell types with the statements that most accurately describe them to test your understanding of prokaryotic cells, eukaryotic cells, and viruses.
Contains a nucleus and undergoes mitosis
A) Prokaryotic cells
B) Eukaryotic cells
C) Viruses
D) Both eukaryotic and prokaryotic cells
E) Prokaryotic cells, eukaryotic cells and viruses
B) Eukaryotic cells
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In female humans and other mammals, dosage compensation is achieved by the inactivation of one of the two X chromosomes in each cell. Which one of the following does not occur in the X-inactivation mechanism of female mammals?
A. X-inactivation begins with a small region of the X chromosome that contains a gene for an X-inactivation specific transcript (Xist). B. Xist is expressed in low levels except when an X chromosome is about to be inactivated. C. When an X chromosome is about to be inactivated, Xist RNA transcripts increase markedly and undergo splicing, but do not encode a protein. D. Xist RNA is attracted to and associates with a protein called the X-chromosome inactivation center (XIC), which becomes entirely coated with Xist. E. Xist RNA recruits factors that promote DNA methylation, histone modification, and other changes associated with transcriptional silencing.
Match the following nerve locations or functions with the correct division of the autonomic nervous system (sympathetic or parasympathetic) by writing an "S" or "P" next to the phrase
______ accelerate heart rate ______ decrease heart rate ______ dilate pupil ______ constrict pupil ______ stimulate activity of stomach and intestines ______ inhibit activity of stomach and intestines ______ relaxes lung bronchi ______ constricts lung bronchi ______ nerves branch from middle region of the spinal cord ______ nerves branch from the brain and the posterior region of spinal cord What will be an ideal response?
A population grows as long as its ____
a. total fertility rate exceeds the replacement fertility rate b. replacement fertility rate exceeds the total fertility rate c. total fertility rate equals the replacement rate d. total fertility rate is at least twice the replacement fertility rate e. total fertility rate falls below the average replacement fertility rate
What refers to the situation in which the binding of a substrate to the enzyme causes a change in the enzyme's shape,
facilitating an enzyme's function? a. active site b. cofactor c. induced fit d. activation energy e. allosteric inhibition