Unlike plant cells, fungal cells lack which of the following?

A. mitochondria
B. chloroplasts
C. cell walls
D. nuclei
E. cytoplasm


Answer: B. chloroplasts

Biology & Microbiology

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Codon usage and even the genetic code itself varies from one organism to the next

Indicate whether the statement is true or false.

Biology & Microbiology

You have a sequence of DNA with a site on which the restriction enzyme EcoRI will act. EcoRI recognizes the sequence below and cuts each strand at the locations indicated by the arrows

Below is your sequence of DNA. You cut it with EcoRI. What fragments are produced? 5'ATTCGCGGAATTCTGG3' 3'TAAGCGCCTTAAGACC5' A. 5'ATTCGCGG3' 5'AATTCTGG3' 3'TAAGCGCCTTAA5' 3'GACC5' B. 5'ATTCGCGGAATT3' 5'CTGG3' 3'TAAGCGCC5' 3'TTAAGACC5' C. 5'ATTCGCGG3' 5'AATTCTGG3' 3'TAAGCGCC5' 3'TTAAGACC5' D. 5'ATTCGCG3' 5'GAATTCTGG3' 3'TAAGCGCCTTAAG5' 3'ACC5' E. 5'ATTCGCGG3' 5'AATT3' 5'CTGG3' 3'TAAGCGCC5' 3'TTAA5' 3'GACC5'

Biology & Microbiology

Which receptor is associated with the perception of pain?

A. thermoreceptor B. chemoreceptor C. nociceptor D. photoreceptor

Biology & Microbiology

Water provides electrons, hydrogens, and oxygen in photosystem I. The resulting electrons in photosystem I

A. replace the electrons lost by chlorophylls. B. are added to hydrogens so they can be transported across the thylakoid membranes more easily. C. directly pass through ATP synthase enzymes to activate them in transforming ADP to ATP. D. are added back to oxygen. E. are used by the rubisco enzyme to complete carbon fixation with RuBP and CO2.

Biology & Microbiology