Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they ____________________
(a) create a new arrangement of electron shells.
(b) change the reactivity of the bonded atoms.
(c) limit the rotation of the bonded atoms.
(d) prevent additional bonds from being formed with the bonded atoms.
(c)
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Match the following items with the correct phrases.
_______1. Short, hairlike projections used as organelles of locomotion by some eucaryotic cells. _______2. Found on some bacteria; they serve an antiphagocytic function. _______3. Found on some bacteria; they enable the bacteria to adhere to surfaces. _______4. Composed of a protein called flagellin. _______5. Long, whiplike structures having an internal organization that is described as a “9 + 2” arrangement of microtubules. a. pili b. cilia c. eucaryotic flagella d. capsules e. procaryotic flagella
Classical conditioning such as the salivating of Pavlov's dog in response to a metronome is based on a(n)
A. operant condition. B. sign stimulus. C. involuntary response. D. dishabituation. E. critical period.
Transcription in eukaryotes requires which of the following in addition to RNA polymerase?
A) start and stop codons B) ribosomes and tRNA C) several transcription factors D) aminoacyl-tRNA synthetase
A scientist is investigating a hormone response in rose bush stems by removing the apical meristems of the main stems. What is the most likely result of this experiment and what hormone is responsible?
A. More leaf buds will appear along the main stems under the influence of auxin. B. Flowers will turn yellow and fall off under the influence of auxin. C. New apical buds will develop under the influence of auxin. D. Lateral buds will develop under the influence of cytokinin. E. Larger, deeper roots will form under the influence of cytokinin.