One hypothesis proposes that an asteroid impact at the end of the ___________ led to the extinction of dinosaurs.

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


Cretaceous

Biology & Microbiology

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Extremely high or low doses of an immunogen may suppress a specific immune response by stimulating the development of

A) specificity. B) memory. C) tolerance. D) class switching.

Biology & Microbiology

If an mRNA carries CUCGAU as a sequence,

what would be the complementary sequence on the DNA?

a. CTCGAT b. GUGCUA c. GTGCAT d. GAGCTA e. ACATGC

Biology & Microbiology

Which bone is also known as the “breastbone”?

a. clavicle b. sternum c. radius d. ulna e. humerus

Biology & Microbiology

The epithelial tissue of animal cells is most similar to the ________ of plant cells?

A. xylem B. phloem C. dermal D. ground E. vascular

Biology & Microbiology