All of the following are correct about lymph, except
A. its composition is similar to plasma.
B. it travels in vessels similar to blood vessels.
C. it is transported through the body by the same pump as blood, i.e., the heart.
D. it is made mostly of water.
E. it transports numerous white blood cells.
Answer: C
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) ________ is a mechanism of lowering the activation energy barrier in some reactions, as with the detoxification of hydrogen peroxide.
Fill in the blank(s) with the appropriate word(s).
The yolk, which is a component of many animal eggs, contains a mixture of____
a. individual amino acids and nucleic acids b. proteins and lipids c. proteins and carbohydrates d. nucleic acids and proteins e. lipids and nucleic acids
The most important feature that permits a gene to act as a molecular clock is _____
A) a large number of base pairs B) being acted upon by natural selection C) a reliable average rate of mutation D) a recent origin by a gene-duplication event
Why is ATP needed for muscle contraction?
A) It's needed for calcium release from the sarcoplasmic reticulum. B) Myosin must contact the actin filament and move to pull it toward the midline of the sarcomere. C) It causes calcium to bind to troponin. D) It causes tropomyosin to slide off the myosin-binding sites of actin.