In which structure would you find oxygenated blood?
a. right atrium
b. right ventricle
c. pulmonary veins
d. pulmonary arteries
e. superior and inferior vena cava
ANSWER: c
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In placental mammals, such as humans, the dosage compensation mechanism to equalize expression of sex-linked
genes in males and females involves ____.
a. doubling the gene expression for most genes on the X chromosome in males b. doubling the number of X chromosomes in males during embryonic development c. having all major genes on the X chromosome also present on the Y chromosome d. halving the gene expression for most genes on each X chromosome in females e. inactivating one of the two X chromosomes in most female somatic cells
In a neuron at rest
A. active transport is not occurring. B. sodium ions are more concentrated inside the cell than outside. C. potassium ions are more concentrated outside the cell than inside. D. the inside of the cell is positively charged as compared to the outside. E. potassium ions are more concentrated inside the cell than outside.
The characteristic ____________of a radioisotope allows us to determine the age of rocks and fossils
using a technique called __________. Fill in the blank(s) with the appropriate word(s).
Attenuation in trp gene regulation is accomplished by
A) reducing permeability of tryptophan, the effector molecule. B) blocking expression of trp mRNA. C) formation of secondary mRNA structures in the leader region. D) binding with RNA polymerase. E) repression of the trp operator.