Which of the following experimented with raw meet, maggots and flies in an attempt to disprove the theory of spontaneous generation?
A. Aristotle
B. Lazzaro Spallanzani
C. Antonie van Leeuwenhoek
D. Francesco Redi
Ans: D. Francesco Redi
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The C-terminus of a polypeptide always contains
A. a stop codon. B. a carboxyl group C. an amino group. D. carbon dioxide. E. None of the answers are correct.
Which receptor type helps a gymnast to know when to unfold from a back flip?
a. mechanoreceptors b. photoreceptors c. chemoreceptors d. thermoreceptors e. nociceptors
Many of these non-membranous organelles of eukaryotic cells are necessary to form the cytoskeleton of a cell.
A. cilia B. microfilaments C. ER D. chromatin
The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring are expected to have the AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:
a) multiple alleles and incomplete dominance b) codominance and incomplete dominance c) incomplete dominance only d) multiple alleles and codominance