In a typical feedback loop, an integrator involves the ________ system and an effector involves the ________ systems
a. receptor / nervous
b. glandular / receptor
c. nervous / muscular or glandular
d. stimulus / response
c
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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
The mechanism that causes a vine’s tendrils to grow around an object, such as a wire fenceline, is called ____
a. thigmotropism b. phototropism c. gravitropism d. vernalization e. photoperiodism
Which statement about muscle contraction is false?
a. The sliding filament model was developed by Hugh and Andrew Huxley. b. Acetylcholine released into the synaptic cleft stimulates muscle contraction. c. During contraction, the muscle length does not change, but the actin and myosin filaments shorten. d. Once the T tubules are depolarized, they open Ca2+ channels in the sarcoplasmic reticulum. e. Cross bridges are formed between myosin and actin during muscle contraction.
Microbes can be challenging to study because they often grow in complex communities and it may be difficult to separate the various species from one another to study individually. Which of the following laboratory "tools" or techniques may be of the the most help with separating out different species from complex mixtures?
A) Use of enriched agar for culture B) Use of light microscopy C) Use of transmission electron microscopy D) Use of selective agars for culture