Which of the following junctions are important for cell signaling?
A. adherins junctions
B. gap junctions
C. plasmodesmata
D. desmosomes
E. All of the choices are correct.
E. All of the choices are correct.
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Following reports that stained chromosomes "disappeared" while observing cell division, scientists in the early 1900s determined the molecule of heredity to be
A) DNA. B) RNA. C) protein. D) lipids. E) carbohydrates.
Chromosomes will break at particular spots and undergo several translocations. Which species has not undergone chromosome breakage and translocations? a. Humans b. Pigs c. Cows d. All have undergone breakage and translocations
e. Mice
To prevent a shipwreck, submarines determine where objects are positioned under water using sonar, sound waves
This method of detection is similar to a(n): a. snake using thermoreceptors to locate its prey. b. shark using lateral line receptors to locate its prey. c. frog using mating calls to locate a female. d. earthworm being able to determine its position underground using a statocyst. e. bat using echolocation to hunt prey.
In which environmental conditions can you find microorganisms?
A) low oxygen B) high temperature C) high salt content D) high pressure E) all of these