Which of the following are not a correct match of cells and their function?

A. sieve elements: transport of sugars
B. vessel elements: transport of water
C. companion cells: protein synthesis and cell
metabolism
D. bundle sheath cells: transport of sugars
E. tracheids: transport of water


D

Biology & Microbiology

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ORF refers to

A. the region of a gene that serves as the promoter. B. the location of the start site of transcription. C. the region of a gene that codes for a protein or a functional RNA product. D. the region between the ribosome binding site and translation initiation codon.

Biology & Microbiology

________ are nonviral genetic elements that have reverse transcriptase activity.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which developmental stage occurs first?

a. cleavage b. fetus c. gastrula d. zygote e. blastula

Biology & Microbiology

Redi concluded from his experiment that 

A. maggots arise from decaying meat. B. air is a "vital element" necessary for spontaneous generation. C. living things arise from other living things. D. microorganisms are present in the air.  

Biology & Microbiology