What is one piece of evidence that some organelles like mitochondria and chloroplasts within eukaryotes used to be independent prokaryotes that were incorporated into eukaryotic cells?
A) the DNA inside organelles is not made of the same four bases as the DNA in the host cells
B) organelles float around independently inside eukaryotic cells
C) prokaryotes are seen incorporating into cells today
D) organelles are very similar to present-day bacteria, suggesting a common ancestor
D
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Viewed from Pluto, the Sun would appear more than a thousand times fainter than on Earth
Indicate whether the statement is true or false
An object falls freely from a height, H. It is released at t = 0 and strikes the ground at t = T. Consider the time at which the object is at a height of H/2. Also consider the height at which the object is located at the time T/2. Which of the following is true?
1.When the object is at a height H/2, the time is less than T/2 and when the time is T/2, the object is at a height of less than H/2. 2.One cannot tell which of these choices may be true from the given information. 3.When the object is at a height of H/2, the time is equal to T/2. 4.When the object is at a height H/2, the time is greater than T/2 and when the time is T/2, the object is at a height of more than H/2.
When using the equation that relates linear speed and rotational velocity (v = r?) what are acceptable units for the rotational velocity (?) ?
A. degrees/s B. Radians/min C. Rev/min (rpm)
Two ropes are spliced together as shown.
A short time after the incident pulse shown in the diagram reaches the splice, the rope's appearance will be that in
A.
B.
C.
D.
E.
