Within a cell, the amount of protein made using a given mRNA molecule depends partly on _____
A) the degree of DNA methylation
B) the rate at which the mRNA is degraded
C) the presence of certain transcription factors
D) the number of introns present in the mRNA
E) the types of ribosomes present in the cytoplasm
Answer: B
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One way to facilitate gene therapy to particular types of cells is via genetically engineered ________ infections.
Fill in the blank(s) with the appropriate word(s).
What was the probable source of gases
constituting the early atmosphere?
a. other planets orbiting the sun but close enough to the early earth b. meteorites c. volcanoes d. stromatolites e. comets
The best definition of learning is:
a. a conditioned response to a repetitive stimulus. b. a long-term change in behavior due to experience. c. a trial and error response to negative feedback. d. the ability to ignore unwanted or irrelevant stimuli. e. communication with another member of a society for mutual benefit.
The development of normal maternal behavior in female mice depends on interactions between the female and her young and the presence of a gene called fosB. In mice with functional fosB genes, a sequence of events occurs after babies are born.Arrange the events in their normal sequence following the birth of baby mice for a wildtype female.1. The gene fosB is activated, producing protein that activates other genes.2. Female crouches over young and retrieves them if they leave the nest.3. Female inspects newborns.4. Neural circuitry within the hypothalamus is modified, facilitating maternal behavior.5. Auditory, olfactory, and tactile signals about the young are sent to the hypothalamus.
Fill in the blank(s) with the appropriate word(s).