Which structure in the earthworm's digestive tract is utilized for food storage?
a. crop
b. esophagus
c. gizzard
d. intestine
e. mouth
A
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The Sec system is used by
A. both Gram-positive and Gram-negative bacteria. B. neither Gram-positive nor Gram-negative bacteria. C. Gram-negative bacteria only. D. Gram-positive bacteria only.
Sponges biggest hardship is being in constant competition with ________
a. sunlight b. food c. calcium carbonate d. space on solid materials
Describe the maternal age effect associated with Down syndrome
What will be an ideal response?
Match the type of phenotypic change below with the type of genetic change most likely to cause it. Each type of genetic change may be used more than once, or may not be used at all
Phenotypic changes: 1. A protein normally localized in the nucleus is now localized in the cytoplasm. _________ 2. A protein acquires a DNA-binding domain. _________ 3. Tandem copies of a gene are found in the genome. _________ 4. A copy of a bacterial gene is now found integrated on a human chromosome. _________ 5. A protein becomes much more unstable. _________ 6. A protein normally expressed only in the liver is now expressed in blood cells. ________ Types of genetic change: A. mutation within a gene B. gene duplication C. mutation in a regulatory region D. exon shuffling E. horizontal gene transfer