What is the difference between Gram-positive and Gram-negative bacteria?
a. Gram-positive bacteria are surrounded by a single membrane, whereas Gram-negative bacteria are surrounded by a double membrane, with an outer membrane that is porous to ions and small molecules.
b. Gram-positive bacteria make gramicidin A and Gram-negative bacteria do not.
c. Gram-positive bacteria are surrounded by a single membrane, while Gram-negative bacteria have a dual-membrane system with an inner membrane that is porous to small molecules and ions.
d. Gram-positive bacteria are motile and Gram-negative bacteria are not.
Ans: a. Gram-positive bacteria are surrounded by a single membrane, whereas Gram-negative bacteria are surrounded by a double membrane, with an outer membrane that is porous to ions and small molecules.
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Which of the following is not true of a viroid?
A) Cadang-cadang is a viroid disease of the coconut palm. B) Its RNA is circular. C) Its capsid is quite small. D) Viroids possess about 250—400 nucleotides. E) Viroids affect mostly plants.
When two traits are analyzed separately, then the frequencies of each are combined to yield the observed phenotypic ratios, this confirms the principle of ____________________
Fill in the blank(s) with correct word
The plant hormone that coordinates the effects of other plant hormones during development of shoots and roots is
____.
a. auxin b. gibberellin c. cytokinin d. abscisic acid e. ethylene
What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 64 B. 61 C. 20 D. As many as there are different tRNAs