What kind of bonds link amino acids to form the basic sequence of a protein?
a. disulfide
b. hydrogen
c. ionic
d. peptide
e. noncovalent
ANSWER: d
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The protein that helps make vertebrate skin tougher and more waterproof is:
a. collagen b. elastin c. hemoglobin d. keratin e. melanin
____ will inhibit the ability of pathogens to infect other cells.
What will be an ideal response?
James and Sally wanted to have a baby but were not having any luck, so they decided to try an artificial means of conception. They eventually were directed to a laboratory, where sperm and eggs were placed in a dish
This allows a sperm to merge with the egg as it would in the oviduct. This procedure is called ________. A) surrogate motherhood B) gamete intrafallopian transfer C) zygote intrafallopian transfer D) in vitro fertilization
Biological systems use free energy based on empirical data that all organisms require a constant energy input. The first law of thermodynamics states that energy can be neither created nor destroyed
For living organisms, which of the following statements is an important consequence of this first law? A) The energy content of an organism is constant except for when its cells are dividing. B) The organism must ultimately obtain all the necessary energy for life from its environment. C) The entropy of an organism decreases with time as the organism grows in complexity. D) Organisms are unable to transform energy from the different states in which it can exist.