This cellular structure lacks a membrane:
A. microbody
B. endoplasmic reticulum
C. Golgi body
D. nucleus
E. nucleoid
Answer: E
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Imagine that you have set up a genetic screen to identify E. coli mutants that cannot metabolize the amino acid tryptophan for energy. Beginning with a master plate containing many colonies, you prepare replica plates on medium with glucose or tryptophan as the only energy source. You would look for colonies that _____.
A) cannot grow on either type of media B) can grow on both types of media C) can grow only on the plates with tryptophan D) can grow only on the plates with glucose
Following the attachment and invasion of a microorganism, in order to be classified as a disease the microorganism must be capable of:
a. causing inflammation and tissue destruc-tion. b. creating pain and requiring antibiotic treatment. c. multiplication and dissemination to deeper tissues. d. killing the resident microbiota.
If the heterozygous phenotype is intermediate between those of the two different homozygotes, it is called
A. independent assortment. B. incomplete dominance. C. polygenic. D. epistasis. E. codominance.
Acrosomes contain nutrients for the developing sperm cells, and they also secrete hormones and other
signaling molecules. ____________________ Indicate whether the statement is true or false.