Which of the following can be said to occur during every energy transformation?
a. A change occurs in the free energy of the universe.
b. The entropy of the universe increases.
c. A change occurs in the total energy of the universe.
d. The entropy of the universe decreases.
Ans: b. The entropy of the universe increases.
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The part of the atom that is most involved in chemical reactivity is the
A. proton. B. neutron. C. electron. D. nucleus.
Which of these symptoms occur with periodontitis?
A) loosening of the teeth B) inflammation of the gums C) loss of bone in the tooth socket D) dental caries or cavities
Whether a seed is round or wrinkled is due to a single Mendelian gene, with round seeds being dominant to wrinkled seeds. In the progeny of a test cross, _______ of 80 seeds should be round if the unknown round-seeded individual being tested is heterozygous.
A: 0 B: 40 C: 60 D: 20 E: 80
______ are produced by leukocytes and fibroblasts. It inhibits virus replication and cell division and increases the action of certain lymphocytes that kill other cells.
A) Cytokines B) Interferons C) Chemokines D) TNF