All of the following describe facilitated diffusion EXCEPT ____
a. it is specific
b. it is dependent on a concentration gradient
c. it requires ATP
d. it can involve either carrier proteins or channel proteins
e. it involves integral proteins
C
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Why have so few primates gone extinct compared to other species, such as mussels or birds?
a. Primates have large brains. b. Primates are not killed for food or other human uses. c. Primates live in stable environments. d. Primates are among the most closely monitored and protected species. e. Primates are highly mobile.
Plant growth requires steady sources of water and
nutrients obtainable from __________ and soil. Fill in the blank(s) with the appropriate word(s).
Which of the following is true for restriction enzymes?
A. A given restriction enzyme will always recognize the same DNA sequence, but it will cut differently depending on the species of origin of the DNA. B. Each restriction enzyme known is able to make a staggered cut at its recognition site. C. Any restriction enzyme can cut any piece of DNA. D. A different restriction enzyme must be used to open the vector DNA than to excise the gene sequence to be cloned. E. Restriction enzymes are useful in genetic engineering when they make staggered cuts in DNA
A major source of variation in populations of organisms is:
a. differential reproductive success. b. mutation. c. norms of reaction. d. All of the above. e. None of the above.