An organ must contain at least:

A. two different tissue types.
B. connective tissue.
C. all four of the tissue types.
D. two different muscle types.
E. two different cell types.


Answer: A

Biology & Microbiology

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In mammals, Hox genes:

A. specify limbs and other structures associated with each body segment. B. direct development of structures that become parts of the hindbrain, spinal cord, and vertebral column. C. evolved by partial-genome duplication from the ancestral genes. D. are expressed in a sequence that does not reflect their linear order on the chromosome or the regions they affect. E. All of these choices are correct.

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Which part of the mitochondrion shown enhances its ability to produce ATP by increasing the surface area of a mitochondrial membrane?


A) structure A
B) structure B
C) structure C
D) structure D

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Malpighian tubules are the excretory organs found in

A. earthworms. B. flatworms. C. jellyfish. D. insects. E. vertebrates.

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Scientists perform ____ in order to ____ a given ____

a. experiments; test; hypothesis b. tests; experiment; law c. tests; experiment; variable d. facts; test; variable e. hypotheses; try; experiment

Biology & Microbiology