In T4 phages, which of the following makes the initial contact with the appropriate receptor site?
A. Tail fiber
B. Tail tube
C. Collar
D. Base plate
Answer: A
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A ______________ group consists of the most recent common ancestor and some of its descendants.
Fill in the blank(s) with the appropriate word(s).
Stomata close when ____ guard cells and they become ____
a. active transport pumps H+ into; turgid b. active transport of H+ stops in; flaccid c. active transport pumps H+ out of; turgid d. active transport pumps H+ into; flaccid e. active transport of H+ stops in; turgid
Bioactive specialized compounds that function to protect plants from viral, fungal and bacterial pathogens are ____
a. systemins b. phytoalexins
c. PR proteins d. R genes e. heat-shock proteins
Experience with dog breeding has taught geneticists ________
A) that, given enough time, any desired trait can be bred into dogs B) that purebred dogs have offspring with qualities identical to the parents, because all purebred dogs are alike genetically C) that, while physical traits can be molded through artificial selection, behavioral traits cannot D) that geographically isolated groups of dogs may be selected for quite different traits, resulting in a different dog breed