The fact that the earth does not go up in flames in spite of the richness of oxygen in our environment is related to
which of the following concepts?
a. the activation energy needed to break bonds
b. the fact that reactants always have less energy than products
c. the first law of thermodynamics
d. the second law of thermodynamics
e. the abundance of water in our atmosphere which inhibits combustion
ANSWER: a
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In mitosis, if a parent cell has 16 chromosomes, each daughter cell will have how many chromosomes?
a. 64 b. 32 c. 16 d. 8 e. 4
When a sperm penetrates an egg cell
A) the egg undergoes changes that attract another sperm. B) sperm and egg chromosomes merge immediately. C) the resulting cell is haploid. D) the egg has to make a copy of itself before sperm and egg chromosomes merge. E) the egg must undergo meiosis II before merging chromosomes with the sperm.
When B cells are activated, some mass-produce antibodies, while others become ________, to protect the body at a later date.
A. memory B cells B. stationary cells C. mast cells D. memory T cells
An important drug for organ-transplant patients is derived from a fungus that until recently was placed in the imperfect fungi category. Its classification was changed when a student at Cornell University discovered _____ in the species.
Fill in the blank(s) with the appropriate word(s).