Which of the following is most likely to be the source of most of the oxygen in the atmosphere?

A) UV radiation B) weathering of rocks
C) macroevolution D) photosynthesis


Answer: D

Biology & Microbiology

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Rod cells differ from cone cells in that

a. rod cells respond to changes in light intensity, and cone cells detect very dim light. b. rod cells contain pigments which enable the perception of color, and cone cells respond to changes in light intensity. c. rod cells respond to changes in light intensity, and cone cells contain pigments which allow for the perception of color. d. rod cells are responsible for acute daytime vision, and cone cells detect very dim light. e. they are none of these.

Biology & Microbiology

By weight, the amount of DNA in chromatin is less than that of histone

Indicate whether the statement is true or false

Biology & Microbiology

Which one of the following would result in passive immunity?

A) vaccination B) past occurrence of an infection or disease C) production of memory cells D) movement of antibodies across the placenta from mother to child E) stimulation of T cells and B cells by an antigen

Biology & Microbiology

In studying a species of fish, a structure is discovered that has no apparent function. If this is a vestigial structure, what should be found in some relatives of this fish?

A) The structure should be absent. B) A similar structure should be present, but it would be larger and have a function. C) The structure should look different and also have no function. D) The structure should be absent from fossils of ancestors of this species.

Biology & Microbiology