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
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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.
Malpighian tubules are the excretory organs found in
A. earthworms. B. flatworms. C. jellyfish. D. insects. E. vertebrates.
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
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