Which scientist was first credited for observing the cell nucleus?

a. Theodor Schwann
b. Anton van Leeuwenhoek
c. Matthias Schleiden
d. Robert Brown


Ans: d. Robert Brown

Biology & Microbiology

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The protein-coding gene sequences in humans and chimpanzees 

A. are vastly different. B. are about 50% alike. C. are about 80% alike. D. are more than 99% alike. E. are identical.

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The viral oncogene associated with the Rous sarcoma virus is

A) RAS. B) p53. C) ERBB-2. D) SIS. E) SRC.

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Matthew has the inherited form of the eye cancer retinoblastoma (RB). His disease is caused by

A) a germline mutation in one RB allele and no mutation in the other allele. B) a somatic mutation in each copy of the RB gene in the same cell. C) a germline mutation in one RB allele and a somatic mutation in the other allele. D) a somatic mutation in one of the RB genes in the same area of the retina of one eye.

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Why are population projection matrices so complicated?

A) because plant sizes are fixed over time B) because larger populations require more sophistication C) because fecundity is high in some species D) because some species can move back and forth between life stages

Biology & Microbiology