As a seed develops from an ovule, the ovule wall enlarges and develop into a:

a. fruit
b. seed coat


c. megaspore
d. microspore
e. pollen grain


a

Biology & Microbiology

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Which of the following is NOT an adaptation for flight found in birds?

a) lightweight bones filled with air spaces b) many body structures reduced in size or absent altogether c) shelled eggs d) very efficient circulatory and respiratory systems e) all of these are adaptations for flight

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The stripes in skeletal muscle are due to the presence of

A. intercalated disks. B. the branching of cells. C. multiple nuclei per cell. D. actin and myosin filaments. E. tendons connecting the muscle to bone.

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Pseudocoelomate nematodes lack a body cavity. 

A. Correct, their pseudocoel does not allow for the development and expansion of organs. B. Incorrect, their body cavity is fully enclosed by ectoderm but is a functional body cavity. C. Correct, they are solid from the gut to the cuticle. D. Incorrect, although not fully enclosed by mesoderm the pseudocoel is a body cavity.

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What enzyme catalyzes the attachment of amino acids to tRNA molecules?

A. helicase B. topoisomerase C. aminoacyl-tRNA synthetase D. ribosome E. translation factor

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