Sickle cell anemia is caused by a defect in the

A. ability of the blood to clot.
B. chloride ion transport protein.
C. ability of red blood cells to fight infection.
D. oxygen-carrying pigment hemoglobin.


Answer: D

Biology & Microbiology

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Which of the following organisms can produce pheromones? Select all correct answers

A. dogs B. orchids C. fish D. ants E. birds

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Protein-coding ORFsare easier to identify in which type of organism?

a. eukaryotes because they have easily identifiable regulatory regions b. eukaryotes because they have fewer introns c. prokaryotes because they have few introns d. eukaryotes because they have more exons e. prokaryotes because they have more exons

Biology & Microbiology

What name is given to the collection of traits exhibited by an organism?

A) genome B) genotype C) phenotype D) genetic code

Biology & Microbiology

The polypeptide-making organelles, which consist of protein combined with RNA, are called

A. centrosomes. B. Golgi bodies. C. mitochondria. D. ribosomes. E. lysosomes.

Biology & Microbiology