Chromatin remodeling can act as an on/off switch for ________, while microRNA binding can block ________.
A) transcription; translation
B) translation; transcription
C) synthesis of tRNAs; synthesis of rRNAs
D) DNA replication; DNA repair
A) transcription; translation
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Robert Koch received the 1905 Nobel Prize in Physiology or Medicine for
A) developing a smallpox vaccination. B) identifying Mycobacterium tuberculosis as the causative agent of tuberculosis. C) making an effective rabies vaccine. D) developing a smallpox vaccination, identifying Mycobacterium tuberculosis as the causative agent of tuberculosis, and making an effective rabies vaccine.
In the common daisy, genes A and B control flower color. Both genes have a dominant allele (A or B) and a recessive allele (a or b). At least one copy of each dominant allele is required for flowers to be colorful instead of white. Predict the phenotypic ratio of the F2 progeny of a cross between two white-flowered plants, one homozygous for A and the other homozygous for B.
A) 3 colorful : 1 white B) 9 colorful : 7 white C) 9 white : 7 colorful D) 15 white : 1 colorful E) 15 colorful : 1 white
Which of the following is the primary source of energy for chemoautotrophs?
a. inorganic molecules b. living organisms c. previously living organisms d. sunlight
Which line of defense is the body’s inborn, general defense mechanism?
a. adaptive immunity b. the immune system c. B and T cell activity d. innate immunity e. antibody production