Anabolic pathways involved in the synthesis of essential molecules are usually regulated in response to
A) the end product of the pathway.
B) a substrate of the pathway.
C) other metabolites that are limiting.
D) the levels of enzymes in the pathway.
A) the end product of the pathway.
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At any given point along the length of the gill lamella, how does the pO2 of the blood flowing through the blood vessels in the lamella compare to the pO2 of the water flowing over the gill lamella?
A. The pO2 of the blood is lower than the pO2 of the water. B. The pO2 of the blood is higher than the pO2 of the water. C. The partial pressure of oxygen in the blood is equal to the pO2 of the water. D. The pO2 of the blood is variable and cannot be compared to the pO2 of the water. E. The pO2 of the blood never exceeds 50% of the pO2 of the water.
Which of the following is true about the geometry of a chemical bond?
A. Single bonds permit free rotation around the bond resulting in more geometric possibilities. B. Double bonds share two pairs of electrons giving rise to even greater variability. C. Planar bonds have no rotation and therefore give rise to greater geometric possibilities. D. The degree of rotation around a bond determines whether the bond will be single or double. E. The two single bonds of an oxygen atom form a tetrahedron.
Genes that are located on the same chromosome
a. tend to be inherited together. b. will usually appear together in the gamete. c. are said to be linked. d. may be separated during crossing over. e. are all of these.
You are performing a Gram stain on gram-negative bacteria and you stop after the decolorizer step. What is the appearance of the bacteria at this point?
A) purple B) red C) colorless D) brown