In control of the lactose operon, allolactose acts as a(n)

1.repressor.
2.activator.
3.co-repressor.
4.inducer.
5.structural gene.


4

Biology & Microbiology

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The shortage of the neurotransmitter that

causes Parkinson’s disease occurs in the region of the brain that controls

a. memory. b. motor function. c. comprehension. d. sensory perception. e. hearing.

Biology & Microbiology

Refer to the accompanying figure. What is the structure labeled as 9?


a. medusa
b. planula
c. miracidium
d. feeding polyp
e. polyp colony

Biology & Microbiology

Shown below is a hypothetical DNA sequence from a virus. Also shown is the sequence of the mRNA that is synthesized from this DNA.DNA sequence:5'-AGCACCTGCCGAATGGGCCAAATCCTGCCGAATAAA-3'3'-TCGTGGACGGCTTACCCGGTTTAGGACGGCTTATTT -5'mRNA sequence (G* = G cap):5'-G*AGCACCUGCCGCCUGCCGAAUAAAAAAA....-3' What is the base sequence of the intron in the template strand of the DNA?

A. 3'-GGACGGCTTATTT-5' B. 3'-GCTTACCCGGTT-5' C. 3'-TTACCCGGTTTA-5' D. 3'-TCGTGGACGGC-5'

Biology & Microbiology

A plant that is dioecious could also have perfect flowers.

Answer the following statement true (T) or false (F)

Biology & Microbiology